WorldWideScience

Sample records for terras raras gerados

  1. Síntese, caracterização e estudo termoanalítico dos nitrilotriacetatos de terras raras

    OpenAIRE

    Ademir Oliveira da Silva

    2000-01-01

    Este trabalho consiste da preparação, caracterização e estudo do comportamento térmico dos nitrilotriacetatos de terras raras hidratados. A reação entre o cloreto de terra rara e o sal Na2HNTA, em meio aquoso, produziu compostos de fórmula geral mínima TRNTA.xH2O, onde x=2,5 para La e Ce; x=3 para Pr ao Gd (exceto o Pm) e x=4 para TR=Tb ao Lu, incluso Y. A estequiometria desses compostos foi proposta com base nos teores da terra rara, obtidos a partir das curvas TG/DTG, e nos teores de carbon...

  2. Pedogeoquímica em perfis de alteração na região de Lavras (MG. II - elementos menores e elementos das terras raras

    Directory of Open Access Journals (Sweden)

    M. P. C. Lacerda

    2002-03-01

    Full Text Available Na região de Lavras, MG, analisou-se o comportamento geoquímico dos elementos menores (EM e elementos das terras raras (ETR ao longo da evolução pedogenética em perfis de solos com horizonteB textural, individualizados a partir de rochas de composição ácida, intermediária e básica do substrato. Nos perfis, realizaram-se análises químicas de EM e ETR, avaliando perdas e ganhos pelo balanço químico de massa. O estudo possibilitou o grupamento dos EM em duas classes: (amobilidade moderada a alta: perda da rocha fresca até o sólum; (bmobilidade moderada: enriquecimento relativo e eventualmente real no sólum. O comportamento dos ETR revelou grande mobilidade ao longo da evolução dos perfis de alteração.

  3. ANÁLISE TEÓRICA SOBRE A INFLUÊNCIA DA ESTRUTURA ELETRÔNICA NAS PROPRIEDADES MAGNÉTICAS DOS ELEMENTOS TERRAS-RARAS

    Directory of Open Access Journals (Sweden)

    Fábio Henrique Silva Sales

    2013-09-01

    Full Text Available Apresentamos um estudo teórico que propõe uma abordagem de fácil entendimento sobre as propriedades magnéticas dos Terras-Raras (TR disprósio (Dy e o hólmio (Ho, a partir da estrutura eletrônica destes elementos. Os elétrons desemparelhados nos orbitais 4f dão origem magnetismo dos TR, fazendo com que estes apresentem altos valores de momento magnéticos comparados a outros elementos químicos. Sistemas nanomagnéticos artificiais envolvendo nanocamadas de Dy e Ho tem sido amplamente estudado nos últimos anos, devido principalmente às fases magnéticas exóticas apresentadas por esses materiais, favorecendo, cada vez mais, o aparecimento de novas propriedades magnéticas nestes sistemas, e o interesse da indústrias da magneto-eletrônica e refrigeração magnética.

  4. TERRA.

    Science.gov (United States)

    Locke, Kirsty

    1997-01-01

    TERRA (Teaching Ecological Responsibility, Recreation, and Adventure) is an integrated, one-semester, four-course program in environmental science, environmental English, independent geography, and outdoor education for grades 11 and 12 in New Liskeard, Ontario. Program activities include outdoor adventure, environmental research projects,…

  5. Análise térmica aplicada à síntese e caraterização de óxidos mistos de níquel e terras raras

    OpenAIRE

    Adélia Maria Lima da Silva

    1999-01-01

    Este trabalho apresenta um estudo sistemático sobre síntese, caracterização e análise térmica aplicada a óxidos mistos dos tipos TR2NiO4 [TR = La, Eu e Y (III)] e TRNiO3 [TR = Pr, Nd e Sm (III)]. Os primeiros óxidos foram obtidos a partir da decomposição térmica de acetatos de terras raras e níquel utilizando-se três métodos distintos: (1) mistura mecânica; (2) evaporação do solvente e (3) cristalização com acetona. Os acetatos simples e binários foram caracterizados por análise elementar, es...

  6. Recovery of thorium and rare earths by their peroxides precipitation from a residue produced in the thorium purification facility; Recuperacao de torio e terras raras via peroxido do residuo originado na unidade de purificacao de torio

    Energy Technology Data Exchange (ETDEWEB)

    Freitas, Antonio Alves de

    2008-07-01

    As consequence of the operation of a Thorium purification facility, for pure Thorium Nitrate production, the IPEN (Instituto de Pesquisas Energeticas e Nucleares) has stored away a solid residue called RETOTER (REsiduo de TOrio e TErras Raras). The RETOTER is rich in Rare-Earth Elements and significant amount of Thorium-232 and minor amount of Uranium. Furthermore it contains several radionuclides from the natural decay series. Significant radioactivity contribution is generated by the Thorium descendent, mainly the Radium-228(T{sub 1/2}=5.7y), known as meso thorium and Thorium-228(T{sub 1/2} 1.90y). An important thorium daughter is the Lead-208, a stable isotope present with an expressive quantity. After the enclosure of the operation of the Thorium purification facility, many researches have been developed for the establishment of methodologies for recovery of Thorium, Rare-Earth Elements and Lead-208 from the RETOTER. This work presents a method for RETOTER decontamination, separating and bordering upon some radioactive isotopes. The residue was digested with nitric acid and the Radium-228 was separated by the Barium Sulphate co-precipitation procedure. Finally, the Thorium was separated by the peroxide precipitation and the Rare-Earth Elements were also recovered by the Rare-Earth peroxide precipitation in the filtrate solution.(author)

  7. Estudo da sinterização da zircônia dopada com óxidos de terras raras a 5 GPa de pressão Sintering of rare earth-doped zirconia under 5 GPa pressure

    Directory of Open Access Journals (Sweden)

    C. Kuranaga

    2005-06-01

    Full Text Available A zircônia (ZrO2 tem mostrado grande destaque entre as cerâmicas avançadas, atraindo muito o interesse de pesquisadores em seus vários campos de atuação. A zircônia apresenta elevada resistência quando na fase tetragonal, mas a fase estável a temperatura ambiente é a monoclínica, sendo necessário o uso de estabilizantes para a fase tetragonal. Neste trabalho propomos a sinterização rápida da zircônia parcialmente estabilizada com óxidos de terras raras (ZrO2-OTR, mediante o emprego da alta pressão de 5 GPa. As condições de sinterização realizadas neste trabalho são inovadoras, haja visto que utilizou-se de tecnologia alternativa para processar a ZrO2-OTR, chamada de altas temperaturas e altas pressões (HPHT. Foi utilizada uma pressão de 5 GPa, temperaturas de 1100, 1200 e 1300 ºC nos tempos de 2 e 5 min. O melhor resultado foi obtido nas amostras sinterizadas a 5 GPa/1300 ºC/5 min, onde apresentaram microdureza média de 488,73 kgf/mm², para uma tenacidade à fratura de 5,33 MPa.m½, as quais apresentaram densidade da ordem de 97,88% da teórica, e 88% em volume de fase tetragonal retida à temperatura ambiente.Zirconia (ZrO2 has shown great projection among the advanced ceramics, attracting the interest of researchers in its various fields of application. Tetragonal zirconia presents high mechanical strength, but the room temperature stable phase is the monoclinic, being necessary the use of stabilizers for obtaining the tetragonal phase. In this work the rapid sintering of zirconia partially stabilized with rare earth oxides (ZrO2-OTR, via 5 GPa high pressure is proposed. The sintering conditions employed in this work are innovative, due to the use of an alternative technology to process ZrO2-OTR, so called high temperature - high pressure (HPHT. A pressure of 5 GPa and temperatures of 1100, 1200 and 1300 ºC for times of 2 and 5 min were used. The best results were obtained for samples sintered at 5 GPa at 1300 º

  8. LAS ENFERMEDADES RARAS

    Directory of Open Access Journals (Sweden)

    Fanny Cortés M. Dra.

    2015-07-01

    Full Text Available A partir de la década de los 80, las enfermedades raras han ido adquiriendo un lugar prioritario en los programas de salud y en la opinión pública. Se definen como aquellas que tienen una prevalencia menor a 1:2.000 individuos. En general son enfermedades crónicas, invalidantes y en más de un 80% de origen genético. Se estima que existen entre 7.000 y 8.000 enfermedades raras y que afectan al 6-8% de la población. Dada la baja prevalencia específica de cada afección, hay muy poco conocimiento de parte de la comunidad médica en relación a su diagnóstico y manejo. En este artículo se discute la importancia del diagnóstico de precisión, para su adecuado manejo y asesoramiento genético, también se muestra la importancia del trabajo en redes en las enfermedades de baja prevalencia y se destaca el rol fundamental de las agrupaciones de padres y familiares en promover políticas de salud para los afectados.

  9. Analysis list: Rara [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available Rara Blood,Liver,Pluripotent stem cell + mm9 http://dbarchive.biosciencedbc.jp/kyus...hu-u/mm9/target/Rara.1.tsv http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/target/Rara.5.tsv http://dbarchive.bioscience...dbc.jp/kyushu-u/mm9/target/Rara.10.tsv http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/colo/Rara.B...lood.tsv,http://dbarchive.biosciencedbc.jp/kyushu-u/mm9/colo/Rara.Liver.tsv,http://dbarchive.bioscience...dbc.jp/kyushu-u/mm9/colo/Rara.Pluripotent_stem_cell.tsv http://dbarchive.biosciencedbc

  10. Recovery of radiogenic lead-208 from a residue of thorium and rare earths obtained during the operation of a thorium purification pilot plant; Separacao e recuperacao de chumbo-208 dos residuos de torio terras raras gerados na unidade piloto de purificacao de nitrato de torio

    Energy Technology Data Exchange (ETDEWEB)

    Seneda, Jose Antonio

    2006-07-01

    Brazil has a long tradition in thorium technology, from mineral dressing (monazite) to the nuclear grade thorium compounds. The estimate reserves are 1200,000. ton of ThO{sub 2}. As a consequence from the work of thorium purification pilot plant at Instituto de Pesquisas Energeticas e Nucleares-CNEN/IPEN-SP, about 25 ton of a sludge containing thorium and rare earths was accumulated. It comes as a raffinate and washing solutions from thorium solvent extraction. This sludge, a crude hydroxide named RETOTER contains thorium, rare earths and minor impurities including the radiogenic lead-208, with abundance 88.34 %. This work discusses the results of the studies and main parameters for its recovery by anionic ion exchange technique in the hydrochloric system. The isotope abundance of this lead was analyzed by high resolution mass spectrometer (ICPMS) and thermoionic mass spectrometer (TIMS) and the data was used to calculate the thermal neutron capture cross section. The value of {sigma}{gamma}{sup 0} = 14.6{+-}0.7 mb was found, quite different from the {sigma}{gamma}{sup 0} = 174.2 {+-} 7.0 mb measure cross section for the natural lead. Preliminary study for the thorium and rare earths separation and recovery was discussed as well. (author)

  11. Analysis list: RARA [Chip-atlas[Archive

    Lifescience Database Archive (English)

    Full Text Available RARA Blood,Neural + hg19 http://dbarchive.biosciencedbc.jp/kyushu-u/hg19/target/RAR...A.1.tsv http://dbarchive.biosciencedbc.jp/kyushu-u/hg19/target/RARA.5.tsv http://dbarchive.biosciencedbc.jp/...kyushu-u/hg19/target/RARA.10.tsv http://dbarchive.biosciencedbc.jp/kyushu-u/hg19/colo/RARA.Blood.tsv,http://dbarchive.bioscience...dbc.jp/kyushu-u/hg19/colo/RARA.Neural.tsv http://dbarchive.bioscience...dbc.jp/kyushu-u/hg19/colo/Blood.gml,http://dbarchive.biosciencedbc.jp/kyushu-u/hg19/colo/Neural.gml ...

  12. Como seria a Terra sem a lua?

    OpenAIRE

    Estevinho, Adriana Patrícia Gonçalves; Mesquita, Elisabete da Conceição Afonso; Minhoto, Paula Maria Lino Veigas

    2012-01-01

    A vida que existe na Terra resulta de um conjunto de circunstâncias muito particulares e raras nas quais se inclui a presença da Lua. A Lua é o satélite natural da Terra e os dois planetas influenciam-se mutuamente. Apesar de ser um pequeno planeta a Lua é responsável por vários fenómenos terrestres como as marés que afetam a velocidade de rotação da Terra. O seu afastamento, apesar de lento é constante e provocará alterações nas condições do planeta que permitem sustentar a vi...

  13. ¿Qué es una enfermedad rara?

    OpenAIRE

    Dirección General de Salud Pública y Participación. Gobierno del Principado de Asturias

    2014-01-01

    Enfermedades Raras en Asturias. Dirección General de Salud Pública y Participación. Informes breves 01 Defining what is meant by rare diseases. Definición de lo que se entiende por enfermedades raras.

  14. Arabia Terra

    Science.gov (United States)

    2002-01-01

    [figure removed for brevity, see original site] This image shows deposits in a crater located in Arabia Terra. Arabia is generally dust covered and dark streaks or dust avalanches are present in the crater walls. The dominant geologic process acting in this crater interior is wind erosion. The central crater deposits are eroded to form yardangs, or linear wind-sculpted hills that resemble an inverted boat hull. Deflation and abrasion are capable of eroding rock structures that are aligned parallel to wind direction. In the lower right hand side of the crater, a dark deposit has formed barchan dunes. These crescent shaped dunes have 'horns' that point downwind indicating general northwest to southeast wind direction. These dark sands probably played a role in the erosion and formation of the yardangs.Note: this THEMIS visual image has not been radiometrically nor geometrically calibrated for this preliminary release. An empirical correction has been performed to remove instrumental effects. A linear shift has been applied in the cross-track and down-track direction to approximate spacecraft and planetary motion. Fully calibrated and geometrically projected images will be released through the Planetary Data System in accordance with Project policies at a later time.NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.

  15. Characterisation of genome-wide PLZF/RARA target genes.

    Directory of Open Access Journals (Sweden)

    Salvatore Spicuglia

    Full Text Available The PLZF/RARA fusion protein generated by the t(11;17(q23;q21 translocation in acute promyelocytic leukaemia (APL is believed to act as an oncogenic transcriptional regulator recruiting epigenetic factors to genes important for its transforming potential. However, molecular mechanisms associated with PLZF/RARA-dependent leukaemogenesis still remain unclear.We searched for specific PLZF/RARA target genes by ChIP-on-chip in the haematopoietic cell line U937 conditionally expressing PLZF/RARA. By comparing bound regions found in U937 cells expressing endogenous PLZF with PLZF/RARA-induced U937 cells, we isolated specific PLZF/RARA target gene promoters. We next analysed gene expression profiles of our identified target genes in PLZF/RARA APL patients and analysed DNA sequences and epigenetic modification at PLZF/RARA binding sites. We identify 413 specific PLZF/RARA target genes including a number encoding transcription factors involved in the regulation of haematopoiesis. Among these genes, 22 were significantly down regulated in primary PLZF/RARA APL cells. In addition, repressed PLZF/RARA target genes were associated with increased levels of H3K27me3 and decreased levels of H3K9K14ac. Finally, sequence analysis of PLZF/RARA bound sequences reveals the presence of both consensus and degenerated RAREs as well as enrichment for tissue-specific transcription factor motifs, highlighting the complexity of targeting fusion protein to chromatin. Our study suggests that PLZF/RARA directly targets genes important for haematopoietic development and supports the notion that PLZF/RARA acts mainly as an epigenetic regulator of its direct target genes.

  16. A Corrida por Terras

    Directory of Open Access Journals (Sweden)

    Paula Simas de Andrade

    2013-07-01

    Full Text Available PEARCE, Fred. The Land Grabbers - The New Fight over Who Owns the World. Boston: Beacon Press, 2012. 326 p. [Uso da terra rural, Propriedade real terras estrangeiras, propriedade Rural, investimento estrangeiro]. ISBN 978-0-8070-0324-4.

  17. RARA fusion genes in acute promyelocytic leukemia: a review.

    Science.gov (United States)

    De Braekeleer, Etienne; Douet-Guilbert, Nathalie; De Braekeleer, Marc

    2014-06-01

    The t(15;17)(q24;q21), generating a PML-RARA fusion gene, is the hallmark of acute promyelocytic leukemia (APL). At present, eight other genes fusing with RARA have been identified. The resulting fusion proteins retain domains of the RARA protein allowing binding to retinoic acid response elements (RARE) and dimerization with the retinoid X receptor protein (RXRA). They participate in protein-protein interactions, associating with RXRA to form hetero-oligomeric complexes that can bind to RARE. They have a dominant-negative effect on wild-type RARA/RXRA transcriptional activity. Moreover, RARA fusion proteins can homodimerize, conferring the ability to regulate an expanded repertoire of genes normally not affected by RARA. RARA fusion proteins behave as potent transcriptional repressors of retinoic acid signalling, inducing a differentiation blockage at the promyelocyte stage which can be overcome with therapeutic doses of ATRA or arsenic trioxide. However, resistance to these two drugs is a major problem, which necessitates development of new therapies.

  18. Utopia, Terra de Felicidade

    OpenAIRE

    Machado, Joaquim

    2012-01-01

    Faz-se aqui uma leitura da Utopia de S. Tomás Moro, procurando desvelar o alcance simbólico do seu sentido. Ressaltam-se particularmente, na ilha da Eutopia, os seus símbolos de terra de felicidade, de retorno às origens paradisíacas da humanidade, de uma terra moldada pelo Céu e de pousada feliz.

  19. TERRA – MADRE

    Directory of Open Access Journals (Sweden)

    Luz Ampario Osorio

    2014-02-01

    Full Text Available Cantante, danzatrice, esperta di canti religiosi di tutto il mondo, Luz è figlia di quattro lingue diverse: spagnolo, olandese, inglese, italiano e ha letto poesie scritte in quelle lingue. Tema centrale, il legame fra l’individuo e la terra, sua madre, a cui tornare sempre. Terra da amare, rispettare, cantare.  Earth - Mother Singer, dancer, expert on religious songs from around the world, Luz is the daughter of four different languages: Spanish, Dutch, English, Italian and she read poems written in these languages. The central theme is the link between the individual and the earth, the mother, to whom one always returns. Earth to love, to respect, to celebrate.

  20. “Sendratari Rara Jonggrang” Dalam Perspektif Koreografis dan Pariwisata

    Directory of Open Access Journals (Sweden)

    Hersapandi Hersapandi

    2017-07-01

    ABSTRAK “Sendratari Rara Jonggrang” adalah drama tari tanpa dialog yang mengambil cerita dari legenda candi Prambanan. Koreografi seni wisata ini  dicipta sebagai alternatif destinasi seni pertunjukan wisata terbarukan di Yogyakarta. Logika hukum ekonomi antara permintaan dan penawaran dari jumlah angka kunjungan wisatawan ke candi Prambanan sebesar 2.992 orang/hari merupakan peluang bisnis kreatif untuk meningkatkan kemampuan ekonomi  dan kekuatan daya saing bangsa. Keunggulan komparatif dan kompetitif  koreografi seni wisata  ini diyakini dapat menjadi ikon baru daya tarik wisatawan di objek wisata candi Prambanan. Proses kreatif penciptaan sendratari Rara Jonggrang (kreativitas budaya dan proses kreatif dalam perekonomian (kreativitas ekonomi merupakan bagian strategis dalam membangun ekonomi kreatif yang berbasis pada nilai-nilai kearifan lokal, sehingga memberi kontribusi  bagi penguatan seni tradisi dan ekonomi masyarakat pendukungnya.   Kata kunci: sendratari, koreografi, seni wisata, manajemen, ekonomi kreatif

  1. EOS Terra Terra Constellation Exit/Future Maneuver Plans Update

    Science.gov (United States)

    Mantziaras, Dimitrios

    2016-01-01

    This EOS Terra Constellation Exit/Future Maneuver Plans Update presentation will discuss brief history of Terra EOM work; lifetime fuel estimates; baseline vs. proposed plan origin; resultant exit orbit; baseline vs. proposed exit plan; long term orbit altitude; revised lifetime proposal and fallback options.

  2. Telomeres and disease: enter TERRA.

    Science.gov (United States)

    Maicher, André; Kastner, Lisa; Luke, Brian

    2012-06-01

    Telomere function is tightly regulated in order to maintain chromosomal stability. When telomeres become dysfunctional, the replicative capacity of cells diminishes and cellular senescence ensues. This can lead to impaired tissue replenishment and eventually degenerative disorders, referred to as telomere syndromes. Cancer can also develop as a result of the genomic instability associated with telomere dysfunction. TERRA (TElomeric Repeat containing RNA) is a long non-coding transcript that stems from sub-telomeric regions and continues into the telomeric tract and is therefore a hybrid of both sub-telomeric and telomeric sequence. In general, increased TERRA transcription is associated with telomere shortening and compromised telomere function. Here we will briefly outline the general principles behind telomere dysfunction-associated diseases. Furthermore, we will discuss the few known links that exist between telomere transcription (TERRA) and disease. Finally, we will speculate on how the understanding, and eventual manipulation, of TERRA transcription could potentially be used in terms of therapeutic strategies.

  3. Synthesis, characterization and thermal behavior of rare earth amido sulfonates; Sintese, caracterizacao e comportamento termico de amidossulfonatos de terras raras

    Energy Technology Data Exchange (ETDEWEB)

    Luiz, Jose Marques; Nunes, Ronaldo Spezia, E-mail: jmluiz@feg.unesp.br [Universidade Estadual Paulista Julio Mesquita Filho (UNESP), Guaratingueta, SP (Brazil). Faculdade de Engenharia. Departamento de Fisica e Quimica; Matos, Jivaldo do Rosario [Universidade de Sao Paulo (USP), SP (Brazil). Instituto de Quimica

    2013-09-01

    Hydrated compounds prepared in aqueous solution by reaction between amidosulfonic acid [H{sub 3}NSO{sub 3}] and suspensions of rare earth hydroxycarbonates [Ln{sub 2}(OH){sub x}(CO{sub 3}){sub y}.zH{sub 2}O] were characterized by elemental analysis (% Ln, % N and % H), infrared spectroscopy (FTIR) and thermogravimetry (TG). The compounds presented the stoichiometry Ln(NH{sub 2}SO{sub 3}){sub 3}.xH{sub 2}O (where x = 1, 5, 2.0 or 3.0). The IR spectra showed absorptions characteristic of H{sub 2}O molecules and NH{sub 2}SO{sub 3} groups. Degree of hydration, thermal decomposition steps and formation of stable intermediates of the type [Ln{sub 2}(SO{sub 4}){sub 3}] and (Ln{sub 2}O{sub 2}SO{sub 4}), besides formation of their oxides, was determined by thermogravimetry. (author)

  4. Study of rare earth separation by counter current electromigration; Estudo da separacao de terras raras por eletromigracao em contra corrente

    Energy Technology Data Exchange (ETDEWEB)

    Correa, Sergio Machado

    1995-08-01

    The counter current electromigration (CCEM) is an electrophoretic technique where the charged species migrate on an electrical field toward an electrolytic flux. Usually this electrolyte is a complexing agent and is necessary to increase the small differences between the species mobilities. A new column was developed, all made of acrylic, in a cylindrical shape. A set of experiments was carried out with the species Na{sup +}/K{sup +}, K{sup +}/Sm{sup +3}, K{sup +}/Eu{sup +3} and K{sup +}/Sm{sup +3}/Eu{sup +3} using the {alpha}-hydrox i-isobutyric acid o,01 M as the counter current electrolytic flux. From a synthetic mixture of 90% of samarium and 10% of europium was obtained the samarium ion in a purity better than 99,9% where the concentration of Eu was determined by the polarography technique. The potassium ion was used as a leading electrolyte. It was also measured the mobilities of the involved species in the {alpha}-HIBA medium. Two models are proposed, a stationary model and a dynamic one. A simulator of a simplified stationary model, prepared in FORTRAN language, was developed and tested toward experimental results. (author)

  5. Hallazgo de plantas nuevas o raras en Vizcaya = Discovery of news or rare plants in Biscay

    Directory of Open Access Journals (Sweden)

    J.J. Barredo Pérez

    2005-01-01

    Full Text Available Se citan once táxones interesantes de la flora vascular de Vizcaya, de ellos, cinco son aloctonas nuevas para Vizcaya -tres de ellas lo son también para la Comunidad Autónoma del País Vasco (CAPV - y de otras seis consideradas raras o muy raras en esta provincia atlántica.

  6. TERRA and the state of the telomere.

    Science.gov (United States)

    Rippe, Karsten; Luke, Brian

    2015-11-01

    Long noncoding telomeric repeat-containing RNA (TERRA) has been implicated in telomere maintenance in a telomerase-dependent and a telomerase-independent manner during replicative senescence and cancer. TERRA's proposed activities are diverse, thus making it difficult to pinpoint the critical roles that TERRA may have. We propose that TERRA orchestrates different activities at chromosome ends in a manner that depends on the state of the telomere.

  7. Godel's Explorations in Terra Incognita

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 6; Issue 7. Gödel's Explorations in Terra Incognita. Vijay Chandru. General Article Volume 6 Issue 7 July 2001 pp 22-28. Fulltext. Click here to view fulltext PDF. Permanent link: http://www.ias.ac.in/article/fulltext/reso/006/07/0022-0028. Author Affiliations.

  8. Molecular Profiling: A Case of ZBTB16-RARA Acute Promyelocytic Leukemia

    Directory of Open Access Journals (Sweden)

    Stephen E. Langabeer

    2017-01-01

    Full Text Available Several variant RARA translocations have been reported in acute promyelocytic leukemia (APL of which the t(11;17(q23;q21, which results in a ZBTB16-RARA fusion, is the most widely identified and is largely resistant to therapy with all-trans retinoic acid (ATRA. The clinical course together with the cytogenetic and molecular characterization of a case of ATRA-unresponsive ZBTB16-RARA APL is described. Additional mutations potentially cooperating with the translocation fusion product in leukemogenesis have been hitherto unreported in ZBTB16-RARA APL and were sought by application of a next-generation sequencing approach to detect those recurrently found in myeloid malignancies. This technique identified a solitary, low level mutation in the CEBPA gene. Molecular profiling of additional mutations may provide a platform to individualise therapeutic management in patients with this rare form of APL.

  9. epidemiológica de las enfermedades raras en España

    Directory of Open Access Journals (Sweden)

    Óscar Zurriaga Lloréns

    2006-01-01

    Full Text Available Fundamento: En el caso de las enfermedades raras existen dificultades para utilizar herramientas como los registros de enfermedades. El objetivo de este trabajo es describir la situación de los registros sobre enfermedades raras en España. Métodos: Se utiliza la información proporcionada por dos directorios de registros sanitarios españoles elaborados por la Agencia Española de Evaluación de Tecnologías Sanitarias, realizando un estudio descriptivo transversal. Los registros identificados en estos directorios se han clasificado como: 1 «Específicos de enfermedades raras», 2 «No específicos pero con información de enfermedades raras», y 3 «No informativos sobre enfermedades raras». Resultados: En el directorio del año 2000 aparecían 82 registros, de los que el 15,8% se clasificaron en el grupo 1, mientras que en la revisión de 2005 se identificaron 107 registros, 16,8% en el grupo 1. Las principales áreas temáticas de los registros sanitarios del grupo 2 fueron el cáncer, la mortalidad, la psiquiatría y la nefrología. En los directorios no se ha hallado ningún registro genérico de enfermedades raras. Conclusiones: Aunque escasos, existen registros sanitarios en España con información sobre enfermedades raras. Se han identificado áreas temáticas con carencias de registros y también registros o sistemas de información no identificados en las fuentes utilizadas. Es necesario continuar los esfuerzos por mejorar la información disponible sobre las enfermedades raras.

  10. Terra firma-forme dermatosis

    Directory of Open Access Journals (Sweden)

    Emel Erkek

    2012-01-01

    Full Text Available Terra firma-forme dermatosis is characterized by ′dirty′ brown-grey cutaneous patches and plaques that can simply be eradicated by forceful swabbing with alcohol pads. The pathogenesis has been attributed to abnormal and delayed keratinization. Although affected patients present with typical lesions, the disorder is not well-known by dermatologists. In this report, we describe two patients with terra firma-forme dermatosis in the setting of xerosis cutis and atopic dermatitis. From a clinical point of view, we lay emphasis on its unique expression and diagnosis/treatment. From a histological perspective, we highlight its resemblance to dermatosis neglecta and speculate on the role of ′neglect′ in a patient with seemingly adequate hygiene. The role of urea containing emollients in the development of this disorder remains to be determined.

  11. Terra firma-forme dermatosis.

    Science.gov (United States)

    Unal, Emine; Guarneri, Claudio; Chokoeva, Anastasiya Atanasova; Wollina, Uwe; Tchernev, Georgi

    2017-03-01

    Terra firma-forme dermatosis (TFFD) belongs to the group of "dirty dermatoses" and represents a not well-known and surely underestimated vexing skin condition. Firstly described by Duncan, Tschen and Knox in 1987, it accounts for a few case series in the literature and has a still undefined aetiology. The authors present an additional report of TFFD, occurring in a young Caucasian girl, and briefly review the current medical literature on the topic.

  12. Breaking new ground: digging into TERRA function.

    Science.gov (United States)

    Maicher, André; Lockhart, Arianna; Luke, Brian

    2014-05-01

    Despite the fact that telomeres carry chromatin marks typically associated with silent heterochromatin, they are actively transcribed into TElomeric Repeat containing RNA (TERRA). TERRA transcription is conserved from yeast to man, initiates in the subtelomeric region and proceeds through the telomeric tract of presumably each individual telomere. TERRA levels are increased in yeast survivors and in cancer cells employing ALT as a telomere maintenance mechanism (TMM). Thus, TERRA may be a promising biomarker and potential target in anti-cancer therapy. Interestingly, several recent publications implicate TERRA in regulatory processes including telomere end protection and the establishment of the heterochromatic state at telomeres. A picture is emerging whereby TERRA acts as a regulator of telomere length and hence the associated onset of replicative senescence in a cell. In this review we will summarize the latest results regarding TERRA transcription, localization and related function. A special focus will be set on the potential role of TERRA in the regulation of telomere length and replicative senescence. Possible implications of increased TERRA levels in yeast survivors and in ALT cancer cells will be discussed. Copyright © 2014 Elsevier B.V. All rights reserved.

  13. Terra Firma-forme Dermatosis

    Directory of Open Access Journals (Sweden)

    Anagha Ramesh Babu

    2013-01-01

    Full Text Available Terra firma-forme dermatosis is a cutaneous discoloration. ‘Dirty’ brown grey cutaneous patches and plaques that can be rid off by forceful swabbing with alcohol pads characterize it. The pathogenesis has been attributed to abnormal and delayed keratinization. It poses no medical threat. A 40-year-old male patient presented to the Department of Dermatology with a 2-3 month history of persistent pigmented patches on both upper arms. The lesions were not associated with itching or burning sensation. He gives no history of exacerbation on exposure to the sun.

  14. NECESSIDADES PRIORITÁRIAS REFERIDAS PELAS FAMÍLIAS DE PESSOAS COM DOENÇAS RARAS

    Directory of Open Access Journals (Sweden)

    Geisa dos Santos Luz

    2016-01-01

    Full Text Available Las enfermedades raras provocan fuerte impacto en las familias, generando necesidades más allá de los relacionados con las enfermedades más frecuentes. La incorporación de nuevas responsabilidades y la relación con los servicios sociales y de salud, son algunas de ellas. Este estudio tiene como objetivo identificar las necesidades prioritarias de las familias de las personas con enfermedades raras, percibidas desde el diagnóstico. Se trata de un estudio cualitativo realizado con 16 miembros de la familia de las personas con enfermedades raras, los residentes de Rio Grande do Sul, cuyos datos fueron recolectados entre noviembre/2012 y marzo/2013, a través de entrevistas semiestructuradas y sometido a análisis de contenido, impulsado por La teoría bio-ecológica del desarrollo humano. Los resultados indican como prioridad las necesidades de: acceso a los servicios sociales y de salud; conocimiento sobre las enfermedades raras; estructuras de apoyo social; la aceptación y la integración social; preservación de la vida personal y familiar. Llegamos a la conclusión de que (reorganizar los servicios y satisfacer las necesidades específicas son condiciones previas para calificar la atención de enfermería y amortiguar el impacto de las causas de enfermedades raras en la família.

  15. TERRA RNA Antagonizes ATRX and Protects Telomeres.

    Science.gov (United States)

    Chu, Hsueh-Ping; Cifuentes-Rojas, Catherine; Kesner, Barry; Aeby, Eric; Lee, Hun-Goo; Wei, Chunyao; Oh, Hyun Jung; Boukhali, Myriam; Haas, Wilhelm; Lee, Jeannie T

    2017-06-29

    Through an integration of genomic and proteomic approaches to advance understanding of long noncoding RNAs, we investigate the function of the telomeric transcript, TERRA. By identifying thousands of TERRA target sites in the mouse genome, we demonstrate that TERRA can bind both in cis to telomeres and in trans to genic targets. We then define a large network of interacting proteins, including epigenetic factors, telomeric proteins, and the RNA helicase, ATRX. TERRA and ATRX share hundreds of target genes and are functionally antagonistic at these loci: whereas TERRA activates, ATRX represses gene expression. At telomeres, TERRA competes with telomeric DNA for ATRX binding, suppresses ATRX localization, and ensures telomeric stability. Depleting TERRA increases telomerase activity and induces telomeric pathologies, including formation of telomere-induced DNA damage foci and loss or duplication of telomeric sequences. We conclude that TERRA functions as an epigenomic modulator in trans and as an essential regulator of telomeres in cis. Copyright © 2017 Elsevier Inc. All rights reserved.

  16. Telomere elongation chooses TERRA ALTernatives.

    Science.gov (United States)

    Arora, Rajika; Azzalin, Claus M

    2015-01-01

    Alternative Lengthening of Telomeres (ALT) mechanisms allow telomerase-negative immortal cells to buffer replicative telomere shortening. ALT is naturally active in a number of human cancers and might be selected upon telomerase inactivation. ALT is thought to operate through homologous recombination (HR) occurring between telomeric repeats from independent chromosome ends. Indeed, suppression of a number of HR factors impairs ALT cell proliferation. Yet, how HR is initiated at ALT telomeres remains elusive. Mounting evidence suggests that the long noncoding telomeric RNA TERRA renders ALT telomeres recombinogenic by forming RNA:DNA hybrids with the telomeric C-rich strand. TERRA and telomeric hybrids act in concert with a number of other factors, including the RNA endoribonuclease RNaseH1 and the single stranded DNA binding protein RPA. The functional interaction network built upon these different players seems indispensable for ALT telomere maintenance, and digging into the molecular details of this previously unappreciated network might open the way to novel avenues for cancer treatments.

  17. Telomere functions grounding on TERRA firma.

    Science.gov (United States)

    Azzalin, Claus M; Lingner, Joachim

    2015-01-01

    Long noncoding telomeric repeat-containing RNAs - TERRAs - are transcribed in a regulated manner from telomeres throughout eukaryotes. TERRA molecules consist of chromosome end-specific subtelomeric sequences and telomeric repeats at their 3' ends. Recent work suggests that TERRA sustains several important functions at chromosome ends. TERRA can regulate telomere length through modulation of exonuclease 1 and telomerase, it may promote recruitment of chromatin modifiers to damaged telomeres and thereby enable DNA end-processing, and it may promote telomere protein composition changes during cell cycle progression. Furthermore, telomere transcription regulates chromosome-end mobility within the nucleus. We review how TERRA, by regulated expression and by providing a molecular scaffold for various protein enzymes, can support a large variety of vital functions. Copyright © 2014 Elsevier Ltd. All rights reserved.

  18. Seasonal food habits of the red panda (Ailurus fulgens) in Rara National Park, Nepal

    OpenAIRE

    Sharma, Hari Prasad; Swenson, Jon E.; Belant, Jerrold L.

    2014-01-01

    We documented the seasonal food habits of the red panda Ailurus fulgens based on the analysis of 152 fecal pellet groups in Rara National Park, Nepal, using micro-histological techniques. We also reviewed previous studies documenting the degree of specialization in red panda diets throughout their range. We found that bamboo was the major food item for red pandas in Rara National Park, occurring in 100% of pellet groups in both the pre- and post-monsoon seasons. Similarly, bamboo was also rep...

  19. Estado de las enfermedades raras que cursan con discapacidad intelectual en Colombia

    OpenAIRE

    Hurtado Sánchez, Johan Sebastián

    2016-01-01

    Las enfermedades raras o huérfano son una problemática que ha tomado mucha importancia en el contexto mundial del presente siglo, estas se han definido como crónicas, de difícil tratamiento de sus síntomas y con baja prevalencia en la población; muchas de estas enfermedades cursan con varios tipos de discapacidad, siendo el objetivo del presente trabajo el enfocarse en aquellas enfermedades raras que cursan con discapacidad intelectual. Para poder profundizar en estas enfermedades se realizó ...

  20. [Terra firma-forme dermatosis].

    Science.gov (United States)

    Pallure, V; Ameline, M; Plantin, P; Bessis, D

    2013-11-01

    Terra firma-forme (i.e. resembling dry earth) is a condition chiefly affecting children wrongly considered as dermatosis arising out of negligence and inadequate corporal hygiene. It is in fact an acquired and asymptomatic grey-brown hyperpigmentation of the skin that persists despite normal washing with soap and water, but which subsides on rubbing with isopropyl alcohol 70%. Herein we report 10 new cases of this disorder. Ten patients aged between 7 months in 17 years were seen for acquired macular skin pigmentation, either brown or grey, fragmented and confluent. In six patients, this abnormality was the main reason for the consultation, generally on aesthetic grounds, and more rarely for diagnosis or suspicion of acanthosis nigricans. In all cases, questioning revealed normal hygiene measures. The condition comprised macular or acquired papular pigmentation, either brown or grey, of bilateral and symmetrical disposition and electively affecting the neck, trunk and retro-malleolar area of the ankles. Clinical examination together with a test involving rubbing with isopropyl alcohol 70° confirmed the diagnosis, revealing healthy underlying skin. Terra firma-forme dermatosis is frequently seen in clinical practice but is largely ignored in the French literature, possibly because of relevant indifference towards the condition. It affects both sexes equally, with no predilection for age or ethnicity, although it is classically seen to a greater extent during adolescence. Diagnosis of the condition, which is easily made thanks to the hyperpigmentation of dirty brown appearance on the neck and the ankles in particular, should not mislead the practitioner into blaming patients for supposedly deficient body hygiene. Knowledge of this form of dermatosis is useful because of its potentially harmful aesthetic and social effects, despite the ease of treatment by insistent rubbing of the affected areas with medical alcohol or ether. Early recognition also avoids pointless

  1. EOS Terra: Mission Status Constellation MOWG

    Science.gov (United States)

    Mantziaras, Dimitrios

    2016-01-01

    This EOS Terra Mission Status Constellation MOWG will discuss mission summary; spacecraft subsystems summary, recent and planned activities; inclination adjust maneuvers, conjunction history, propellant usage and lifetime estimate; and end of mission plan.

  2. TERRA: telomeric repeat-containing RNA.

    Science.gov (United States)

    Luke, Brian; Lingner, Joachim

    2009-09-02

    Telomeres, the physical ends of eukaryotic chromosomes, consist of tandem arrays of short DNA repeats and a large set of specialized proteins. A recent analysis has identified telomeric repeat-containing RNA (TERRA), a large non-coding RNA in animals and fungi, which forms an integral component of telomeric heterochromatin. TERRA transcription occurs at most or all chromosome ends and it is regulated by RNA surveillance factors and in response to changes in telomere length. TERRA functions that are emerging suggest important roles in the regulation of telomerase and in orchestrating chromatin remodelling throughout development and cellular differentiation. The accumulation of TERRA at telomeres can also interfere with telomere replication, leading to a sudden loss of telomere tracts. Such a phenotype can be observed upon impairment of the RNA surveillance machinery or in cells from ICF (Immunodeficiency, Centromeric region instability, Facial anomalies) patients, in which TERRA is upregulated because of DNA methylation defects in the subtelomeric region. Thus, TERRA may mediate several crucial functions at the telomeres, a region of the genome that had been considered to be transcriptionally silent.

  3. DEMONSTRATION BULLETIN: TERRA KLEEN SOLVENT EXTRACTION TECHNOLOGY - TERRA-KLEEN RESPONSE GROUP, INC.

    Science.gov (United States)

    The Terra-Kleen Solvent Extraction Technology was developed by Terra-Kleen Response Group, Inc., to remove polychlorinated biphenyls (PCB) and other organic constituents from contaminated soil. This batch process system uses a proprietary solvent at ambient temperatures to treat ...

  4. Small Volcano in Terra Cimmeria

    Science.gov (United States)

    2002-01-01

    (Released 26 June 2002) The Science This positive relief feature (see MOLA context) in the ancient highlands of Mars appears to be a heavily eroded volcanic center. The top of this feature appears to be under attack by the erosive forces of the martian wind. Light-toned streaks are visible, trending northeast to southwest, and may be caused by scouring of the terrain, or they may be dune forms moving sand. The northeast portion of the caldera area looks as though a layer of material is being removed to expose a slightly lighter-toned surface underneath. The flanks of this feature are slightly less cratered than the surrounding terrain, which could be explained in two ways: 1) this feature may be younger than the surrounding area, and has had less time to accumulate meteorite impacts, or 2) the slopes that are observed today may be so heavily eroded that the original, cratered surfaces are now gone, exposing relatively uncratered rocks. Although most of Terra Cimmeria has low albedo, some eastern portions, such as shown in this image, demonstrate an overall lack of contrast that attests to the presence of a layer of dust mantling the surface. This dust, in part, is responsible for the muted appearance and infill of many of the craters at the northern and southern ends of this image The Story This flat-topped volcano pops out from the surface, the swirls of its ancient lava flows running down onto the ancient highlands of Mars. Its smooth top appears to be under attack by the erosive forces of the martian wind. How can you tell? Click on the image above for a close-up look. You'll see some light-toned streaks that run in a northeast-southwest direction. They are caused either by the scouring of the terrain or dunes of moving sand. Either way, the wind likely plays upon the volcano's surface. Look also for the subtle, nearly crescent shaped feature at the northeast portion of the volcano's cap. It looks as if a layer of material has been removed by the wind, exposing

  5. Synergy against PML-RARa: targeting transcription, proteolysis, differentiation, and self-renewal in acute promyelocytic leukemia

    Science.gov (United States)

    dos Santos, Guilherme Augusto; Kats, Lev

    2013-01-01

    Acute promyelocytic leukemia (APL) is a hematological malignancy driven by a chimeric oncoprotein containing the C terminus of the retinoic acid receptor-a (RARa) fused to an N-terminal partner, most commonly promyelocytic leukemia protein (PML). Mechanistically, PML-RARa acts as a transcriptional repressor of RARa and non-RARa target genes and antagonizes the formation and function of PML nuclear bodies that regulate numerous signaling pathways. The empirical discoveries that PML-RARa–associated APL is sensitive to both all-trans-retinoic acid (ATRA) and arsenic trioxide (ATO), and the subsequent understanding of the mechanisms of action of these drugs, have led to efforts to understand the contribution of molecular events to APL cell differentiation, leukemia-initiating cell (LIC) clearance, and disease eradication in vitro and in vivo. Critically, the mechanistic insights gleaned from these studies have resulted not only in a better understanding of APL itself, but also carry valuable lessons for other malignancies. PMID:24344243

  6. Investigação numérica de escoamento e ruído gerado em corpos rombudos prismáticos.

    OpenAIRE

    Reinaldo Marcondes Orselli

    2012-01-01

    Muitos componentes de máquinas, equipamentos e meios de transporte podem ser representados na forma de corpos rombudos cujos deslocamentos em meio fluido podem gerar ruído. Nesse contexto, a tese tem como proposta o estudo da previsão numérica do ruído gerado oriundo do escoamento em torno de corpos rombudos. Como exemplo representativo de um corpo rombudo, o som gerado do escoamento ao redor de um cilindro é estudado. O escoamento em torno de um cilindro é considerado com esteira tridimensio...

  7. Terra - the Earth Observing System flagship observatory

    Science.gov (United States)

    Thome, K. J.

    2013-12-01

    The Terra platform enters its teenage years with an array of accomplishments but also with the potential to do much more. Efforts continue to extend the Terra data record to build upon its array of accomplishments and make its data more valuable by creating a record length that allows examination of inter annual variability, observe trends on the decadal scale, and gather statistics relevant to the define climate metrics. Continued data from Terra's complementary instruments will play a key role in creating the data record needed for scientists to develop an understanding of our climate system. Terra's suite of instruments: ASTER (contributed by the Japanese Ministry of Economy and Trade and Industry with a JPL-led US Science Team), CERES (NASA LaRC - PI), MISR (JPL - PI), MODIS (NASA GSFC), and MOPITT (sponsored by Canadian Space Agency with NCAR-led Science Team) are providing an unprecedented 81 core data products. The annual demand for Terra data remains with >120 million files distributed in 2011 and >157 million in 2012. More than 1,100 peer-reviewed publications appeared in 2012 using Terra data bringing the lifetime total >7,600. Citation numbers of 21,000 for 2012 and over 100,000 for the mission's lifetime. The broad range of products enable the community to provide answers to the overarching question, 'How is the Earth changing and what are the consequences for life on Earth?' Terra continues to provide data that: (1) Extend the baseline of morning-orbit collections; (2) Enable comparison of measurements acquired from past high-impact events; (3) Add value to recently-launched and soon-to-be launched missions, and upcoming field programs. Terra data continue to support monitoring and relief efforts for natural and man-made disasters that involve U.S. interests. Terra also contributes to Applications Focus Areas supporting the U.S. National Objectives for agriculture, air quality, climate, disaster management, ecological forecasting, public health, water

  8. Análise ergonômica do trabalho e o reconhecimento científico do conhecimento gerado

    OpenAIRE

    Pizo, Carlos Antonio; Menegon, Nilton Luiz

    2010-01-01

    Este texto contextualiza na Análise Ergonômica do Trabalho (AET) as preocupações de pesquisadores da área de ergonomia sobre o reconhecimento científico dos métodos de pesquisa sobre o trabalho. Com base nessas preocupações e numa revisão sobre as características da pesquisa-ação é feita uma análise teórica da simbiose entre esse método de pesquisa e a AET, e como isto contribui para que os conhecimentos gerados na AET possam ter seu reconhecimento científico facilitado junto aos pares das ár...

  9. Scaling the Pipe: NASA EOS Terra Data Systems at 10

    Science.gov (United States)

    Wolfe, Robert E.; Ramapriyan, Hampapuram K.

    2010-01-01

    Standard products from the five sensors on NASA's Earth Observing System's (EOS) Terra satellite are being used world-wide for earth science research and applications. This paper describes the evolution of the Terra data systems over the last decade in which the distributed systems that produce, archive and distribute high quality Terra data products were scaled by two orders of magnitude.

  10. Aplicação de índice comparativo na avaliação do risco de degradação das terras

    Directory of Open Access Journals (Sweden)

    S. B. L. Ranieri

    1998-12-01

    Full Text Available A determinação do risco de degradação das terras em uma microbacia hidrográfica constitui importante subsídio para o planejamento agrícola e ambiental. A tendência atual é que as informações necessárias para a avaliação das terras sejam compatíveis com técnicas de geoprocessamento e tratadas de forma menos subjetiva. Todavia, critérios ou parâmetros que avaliem quantitativamente o risco de degradação das terras e que sejam compatíveis com a escala de microbacia hidrográfica e aplicáveis por meio de Sistemas de Informação Geográfica (SIGs ainda precisam ser mais bem definidos. O objetivo deste trabalho, realizado no segundo semestre de 1996, foi elaborar um método de avaliação comparativa do risco de degradação das terras na bacia hidrográfica dos Marins (Piracicaba, SP, sob diferentes cenários de uso, utilizando SIG. Os mapas de risco de degradação foram gerados com base em matrizes de decisão para os seguintes cenários de uso: (a sem cobertura vegetal; (b uso atual da terra; (c uso único; (d uso redistribuído; (e uso planejado. Os resultados foram comparados por um índice denominado "Índice Ponderado de Risco de Degradação (IP D". Por meio desse índice foi possível comparar quantitativamente o risco de degradação para os cenários de uso propostos. Os resultados mostraram que a tentativa de alterar apenas a distribuição espacial dos usos da terra não foi suficiente para diminuir o risco de degradação final da área, caracterizando, assim, a superutilização das terras da microbacia. Para diminuir os impactos causados por essa superutilização, faz-se necessária a definição de critérios de restrição de ocupação que conciliem áreas de maior suscetibilidade à erosão com usos que ofereçam maior proteção ao solo, levando à diminuição da área ocupada com culturas anuais e semiperenes.

  11. Thermoluminescent analysis of CaSO{sub 4} composites activated with rare earths; Analise termoluminescente de compositos de CaSO{sub 4} ativado com terras raras

    Energy Technology Data Exchange (ETDEWEB)

    Junot, D.O.; Chagas, M.A.P.; Souza, D.N., E-mail: danilo.junot@hotmail.com, E-mail: mchagasfisica@gmail.com, E-mail: divanizi@ufs.br [Universidade Federal de Sergipe (UFS), Sao Cristovao, SE (Brazil). Departamento de Fisica

    2013-07-01

    Since the thermoluminescence started to be applied to the dosimetry of ionizing radiation in 1940 different materials detectors have been proposed, and one of the most common is CaSO{sub 4}. The motivation of this work was to produce crystals of CaSO{sub 4} doped with rare earth elements such as europium (Eu), neodymium (Nd) and thulium (Tm). It was also produced crystals of CaSO{sub 4}:Ag. The interest in the production of these materials was to investigate other methods of production of thermoluminescent materials. The results show that the CaSO{sub 4}:Tm is more suitable for use in the thermoluminescent dosimetry. Although not the most intense peak, the peak at 170 °C could be a dosimetric peak. Analyses showed that all samples have a TL response proportional to the dose absorbed. (author)

  12. Preparation of hard magnetic materials based on nitrogenated rare-earth iron alloys; Preparacao de materiais magneticamente duros a base de ligas de terra rara - ferro nitrogenadas

    Energy Technology Data Exchange (ETDEWEB)

    Guilherme, Eneida da Graca

    1999-07-01

    Nd Fe{sub 11}Ti, Nd Fe{sub 10.5} Mo{sub 1.5} and Nd Fe{sub 10.75} Mo{sub 1.25} alloys were synthesized by reduction-diffusion calciothermic process (RDC) from neodymium chloride (NdCl{sub 3}), iron, titanium, molybdenum and reduction agent (metallic calcium). The effect of process variables, like temperature, time, excess amount of NdCl{sub 3}, heating rate, and composition variation of the Nd Fe{sub 12-x}Mo{sub x} (1 {>=} x {>=} 2). Mother alloys in which 1:12 phase is major were nitrogenated by gas-solid reaction with N{sub 2} and by chemical reaction with sodium zide (Na N{sub 3}). In addition, the influence of reducing particle size of the powdered mother alloys in the nitrogenation step with Na N{sub 3} were studied. As prepared and interstitially modified Nd Fe{sub 11} Ti, Nd Fe{sub 10.5} Mo{sub 1.5} and Nd Fe{sub 10.75} Mo{sub 1.25} alloys with nitrogen , were characterized by X-ray diffraction, Moessbauer spectroscopy, thermomagnetic, SEM and EDS. Nitrogenation by gas-solid reaction with N{sub 2} is found to be not promising, since resulted Curie temperatures (Tc) were lower than literature values. However, nitrogenation by chemical reaction with Na N{sub 3} was efficient with higher or same Tc than previous reported results. The average increases on Tc and volumetric expansion were 200 deg C and 4%, respectively. Milling of the mother alloys before nitrogenation at 330 deg C is preferred because reaction kinetics is enhanced. Nevertheless, at 450 deg C, a competition between the interstitially modified compound formation (alloy + N) and alloy dissociation has occurred, resulting in a Fe-{alpha} phase increase. (author)

  13. Contribuição ao estudo de uma metodologia alternativa para obtenção de dioxissulfeto de terras raras

    Directory of Open Access Journals (Sweden)

    Santos Arnaud Victor dos

    2001-01-01

    Full Text Available In the last decade, many method has been developed to obtain oxysufides. However, theses materials were obtained by reaction involved gaseous toxics, CO, CS2, H2S and S. In the present work, the synthesis of lanthanum oxysufides actived by europium (III through an alternative method has been made. This method involve the rare earth sulfate reduction under an atmosphere of argon contained 10% hydrogen using the thermogravimetric technique. The results showed the formation of the phase TR2O2S (TR = La and Eu at temperatures which depend upon the heating rate, respectively 650 - 830ºC at 5ºC min-1 and 680 - 800ºC at 10ºC min-1. The oxysufides obtained are characterized by infrared spectroscopy. The method developed is more economic than the usual industrial methods and the environmental problems during the synthesis are also better controled.

  14. Riho Terras: "Esitlen Eesti riiki nagu produkti" / Riho Terras ; interv. Erika Prave

    Index Scriptorium Estoniae

    Terras, Riho, 1967-

    2003-01-01

    Ilmunud ka: Severnoje Poberezhje : Subbota 26. apr. lk. 3. Eesti Vabariigi kaitseatashee Saksamaal ja Poolas kolonelleitnant Riho Terras töötab Berliinis ja hoolitseb Eesti kaitsealase koostöö eest Saksamaa ja Poolaga

  15. MODIS/Terra L2 browse jpeg, Aerosol Optical Depth (TERRA Browse Product)

    Data.gov (United States)

    National Aeronautics and Space Administration — This is browse product: "MODIS/Terra L2 browse jpeg, Aerosol Optical Depth" Data set information: http://modis-atmos.gsfc.nasa.gov/ [placeholder metadata

  16. Terras kaitseväe juhatajaks

    Index Scriptorium Estoniae

    2011-01-01

    President Toomas Hendrik Ilvese kutsel Kadriorus kogunenud riigikaitse nõukogu arutas kaitseväe juhataja määramist. Kandidaadina tutvustas kaitseminister Mart Laar brigaadikindral Riho Terrast, kes praegu juhib kaitseväe peastaapi. Terras teenib kaitseväes 1991. aastast. Kaitseväe praeguse juhataja kindralleitnant Ants Laaneotsa ametiaeg lõpeb detsembris

  17. Urihi A: A Terra-Floresta Yanomami

    Directory of Open Access Journals (Sweden)

    James R. Welch

    2010-08-01

    Full Text Available Review of Urihi A: A Terra-Floresta Yanomami. Bruce Albert and William Milliken with Gale Goodwin Gomez. São Paulo: Instituto Socioambiental, 2009. 207 pp., illustrations, tables, bibliography, appendices, index. Paperback ISBN: 978‐85 85994‐72‐3.

  18. Terra in K-16 formal education settings

    Science.gov (United States)

    Chambers, L. H.; Fischer, J. D.; Lewis, P. M.; Moore, S. W.; Oots, P. C.; Rogerson, T. M.; Hitke, K. M.; Riebeek, H.

    2009-12-01

    Since it began, the Terra mission has had an active presence in formal education at the K-16 level. This educational presence was provided through the S’COOL project for the first five years of the mission, joined by the MY NASA DATA project for the second five years. The Students’ Cloud Observations On-Line (S’COOL) Project, begun in 1997 under the auspices of the Clouds and the Earth’s Radiant Energy System (CERES) project, seeks to motivate students across the entire K-12 spectrum to learn science basics and how they tie in to a larger picture. Beginning early on, college level participants have also participated in the project, both in science classes and in science education coursework. The project uses the connection to an on-going NASA science investigation as a powerful motivator for student observations, analysis and learning, and has reached around the globe as shown in the world map. This poster will review the impact that Terra, through S’COOL, has made in formal education over the last decade. The MY NASA DATA Project began in 2004 under the NASA Research, Education and Applications Solutions Network (REASoN). A 5-year REASoN grant enabled the creation of an extensive website which wraps easily accessible Earth science data - including Terra parameters from CERES (involving MODIS data fusion), MISR, and MOPITT (an example for carbon monoxide is given in the graph, with dark areas indicating high CO levels) - with explanatory material written at the middle school level, and an extensive collection of peer-reviewed lesson plans. The MY NASA DATA site has a rapidly growing user-base and was recently adopted by a number of NASA Earth Science missions, in addition to Terra, as a formal education arm of their Education and Public Outreach efforts. This poster will summarize the contributions that Terra, through MY NASA DATA, has made to formal education since 2004.

  19. Terra Mission Operations: Launch to the Present (and Beyond)

    Science.gov (United States)

    Thome, Kurt; Kelly, Angelita; Moyer, Eric; Mantziaras, Dimitrios; Case, Warren

    2014-01-01

    The Terra satellite, flagship of NASAs long-term Earth Observing System (EOS) Program, continues to provide useful earth science observations well past its 5-year design lifetime. This paper describes the evolution of Terra operations, including challenges and successes and the steps taken to preserve science requirements and prolong spacecraft life. Working cooperatively with the Terra science and instrument teams, including NASAs international partners, the mission operations team has successfully kept the Terra operating continuously, resolving challenges and adjusting operations as needed. Terra retains all of its observing capabilities (except Short Wave Infrared) despite its age. The paper also describes concepts for future operations.

  20. Síndrome Williams: una enfermedad rara con sintomatología contradictoria

    OpenAIRE

    Aníbal Puente Ferreras; María Paz Fernández Lozano; Jesús María Alvarado Izquierdo; Virginia Jiménez Rodríguez

    2011-01-01

    El síndrome Williams (SW) es una de las enfermedades raras o infrecuentes. Tiene una incidencia de un caso cada 20.000 nacimientos vivos. Se trata de una alteración genética, localizada en el cromosoma 7 (banda 7q11.23), en el 99% de los casos. La alteración genética afecta el desarrollo y el funcionamiento del sistema nervioso central. Esta enfermedad no tiene cura pero se pueden suavizar los síntomas cognitivos, emocionales y sociales. El SW ocurre casi en exclusividad en niñas y de forma e...

  1. Diagnóstico prenatal y manejo perinatal en enfermedades raras

    Directory of Open Access Journals (Sweden)

    Gustavo Renconret P., Dr.

    2015-07-01

    Full Text Available El diagnóstico y manejo prenatal de enfermedades raras involucra un estudio multidisciplinario. Desde una visión obstétrica, herramientas de imagenología como la ultrasonografía y en menor medida la resonancia magnética fetal (RMF son esenciales para el diagnóstico de anomalías morfológicas y sospecha de defectos cromosómicos. Para el diagnóstico de enfermedades cromosómicas el estudio de cariograma obtenido de vellosidades coriales, líquido amniótico o sangre fetal mediante técnicas invasivas tal como biopsia corial, amniocentesis o cordocentesis ha sido hasta hace poco el gold standard del diagnóstico. Nuevas técnicas moleculares capaces de detectar microdeleciones como es el microarray nos ha permitido aproximarnos al origen de las enfermedades raras. Se revisarán además algunos de los defectos anatómicos raros y su enfoque neonatal.

  2. Laboratory investigation of TerraZyme as a soil stabilizer

    Science.gov (United States)

    Yusoff, Siti Aimi Nadia Mohd; Azmi, Mastura; Ramli, Harris; Bakar, Ismail; Wijeyesekera, D. C.; Zainorabidin, Adnan

    2017-10-01

    In this study, a laboratory investigation was conducted to examine the performance of TerraZyme on different soil types. Laterite and kaolin were treated with 2% and 5% TerraZyme to determine changes in the soils' geotechnical properties. The obtained results were analysed and investigated in terms of compaction, Unconfined Compressive Strength (UCS) and California Bearing Ratio (CBR). The changes in geotechnical properties of the stabilised and unstabilised soils were monitored after curing periods of 0, 7, 15, 21 and 30 days. Changes in compaction properties, UCS and CBR were observed. It was found that laterite with 5% TerraZyme gave a higher maximum dry density (MDD) and decreased the optimum moisture content (OMC). For kaolin, a different TerraZyme percentage did not show any effect on both MDD and OMC. For strength properties, it was found that 2% TerraZyme showed the greatest change in UCS over a 30-day curing period. The CBR value of stabilised kaolin with 2% TerraZyme gave a higher CBR value than the kaolin treated with 5% TerraZyme. It was also found that laterite treated with TerraZyme gave a higher CBR value. Lastly, it can be concluded that TerraZyme is not suitable for stabilising kaolin; TerraZyme requires a cohesive soil to achieve a better performance.

  3. Geologic Mapping in Southern Margaritifer Terra

    Science.gov (United States)

    Irwin, R. P., III; Grant, J. A.

    2010-01-01

    Margaritifer Terra records a complex geologic history [1-5], and the area from Holden crater through Ladon Valles, Ladon basin, and up to Morava Valles is no exception [e.g., 6-13]. The 1:500,000 geologic map of MTM quadrangles -15027, -20027, -25027, and -25032 (Figs. 1 and 2 [14]) identifies a range of units that delineate the history of water-related activity and regional geologic context.

  4. Produção de bioetanol a partir de coproduto gerado no descaroçamento de azeitona

    Directory of Open Access Journals (Sweden)

    Vanessa Medeiros Pereira

    2015-09-01

    Full Text Available Na busca por fontes alternativas de energia menos poluentes e mais sustentáveis, o uso de resíduos agrícolas para a produção de biocombustíveis tem se mostrado uma alternativa promissora. Neste contexto, o presente trabalho teve como objetivo avaliar a viabilidade da produção do bioetanol a partir da polpa de azeitona, um coproduto gerado no processo de descaroçamento das azeitonas de mesa. Avaliaram-se dois tipos de hidrólise como prétratamentos: hidrólise via ácido clorídrico 1% e hidrólise por explosão a vapor com ácido sulfúrico 14%. O líquido hidrolisado foi fermentado por 4 dias à temperatura ambiente, utilizando-se a levedura Saccharomyces cerevisiae. O melhor rendimento em etanol (4,6% v/v foi obtido com a polpa pré tratada com ácido sulfúrico.

  5. Evaluatie van de effectschatting waterkwaliteit Terra Nova Zuid na aanbrengen damwand

    NARCIS (Netherlands)

    Kosten, S.; Faassen, E.J.; Lürling, M.F.L.L.W.

    2009-01-01

    Waternet is van plan om in het gebied Terra Nova een damwand aan te brengen tussen de delen Terra Nova Noord en Terra Nova Zuid om daarmee de overlast van blauwalgen in Terra Nova Noord tegen te gaan. Een groep bewoners van Terra Nova Zuid vreest echter voor negatieve gevolgen van deze maatregel op

  6. Variable TERRA abundance and stability in cervical cancer cells.

    Science.gov (United States)

    Oh, Bong-Kyeong; Keo, Ponnarath; Bae, Jaeman; Ko, Jung Hwa; Choi, Joong Sub

    2017-06-01

    Telomeres are transcribed into long non-coding RNA, referred to as telomeric repeat-containing RNA (TERRA), which plays important roles in maintaining telomere integrity and heterochromatin formation. TERRA has been well characterized in HeLa cells, a type of cervical cancer cell. However, TERRA abundance and stability have not been examined in other cervical cancer cells, at least to the best of our knowledge. Thus, in this study, we measured TERRA levels and stability, as well as telomere length in 6 cervical cancer cell lines, HeLa, SiHa, CaSki, HeLa S3, C-33A and SNU-17. We also examined the association between the TERRA level and its stability and telomere length. We found that the TERRA level was several fold greater in the SiHa, CaSki, HeLa S3, C-33A and SNU-17 cells, than in the HeLa cells. An RNA stability assay of actinomycin D-treated cells revealed that TERRA had a short half-life of ~4 h in HeLa cells, which was consistent with previous studies, but was more stable with a longer half-life (>8 h) in the other 5 cell lines. Telomere length varied from 4 to 9 kb in the cells and did not correlate significantly with the TERRA level. On the whole, our data indicate that TERRA abundance and stability vary between different types of cervical cancer cells. TERRA degrades rapidly in HeLa cells, but is maintained stably in other cervical cancer cells that accumulate higher levels of TERRA. TERRA abundance is associated with the stability of RNA in cervical cancer cells, but is unlikely associated with telomere length.

  7. Rara causa de discapacidad intelectual: síndrome de Coffin Lowry

    OpenAIRE

    Elibett Carcasés Carcasés; Jorge Lefebre Navarro; Nora Orive Rodríguez; Orlando Peña Mancebo

    2015-01-01

    El síndrome de Coffin–Lowry (CLS) es una rara forma sindrómica de retardo mental, que muestra una herencia dominante ligada al X. Sus signos principales son el retardo del desarrollo psicomotor y del crecimiento, las dismorfias craneofaciales, las anomalías digitales y las alteraciones esqueléticas progresivas. Se aplicó el método clínico y la técnica comparativa o de patrón para realizar el diagnóstico del CLS en escolar femenina, blanca, de 8 años, que llegó a servicio de Genética remitida ...

  8. PML-RARa modulates the vascular signature of extracellular vesicles released by acute promyelocytic leukemia cells.

    Science.gov (United States)

    Fang, Yi; Garnier, Delphine; Lee, Tae Hoon; D'Asti, Esterina; Montermini, Laura; Meehan, Brian; Rak, Janusz

    2016-01-01

    Oncogenic transformation is believed to impact the vascular phenotype and microenvironment in cancer, at least in part, through mechanisms involving extracellular vesicles (EVs). We explored these questions in the context of acute promyelocytic leukemia cells (NB4) expressing oncogenic fusion protein, PML-RARa and exquisitely sensitive to its clinically used antagonist, the all-trans retinoic acid (ATRA). We report that NB4 cells produce considerable numbers of EVs, which are readily taken up by cultured endothelial cells triggering their increased survival. NB4 EVs contain PML-RARa transcript, but no detectable protein, which is also absent in endothelial cells upon the vesicle uptake, thereby precluding an active intercellular trafficking of this oncogene in this setting. ATRA treatment changes the emission profile of NB4-related EVs resulting in preponderance of smaller vesicles, an effect that occurs in parallel with the onset of cellular differentiation. ATRA also increases IL-8 mRNA and protein content in NB4 cells and their EVs, while decreasing the levels of VEGF and tissue factor (TF). Endothelial cell uptake of NB4-derived EVs renders these cells more TF-positive and procoagulant, and this effect is diminished by pre-treatment of EV donor cells with ATRA. Profiling angiogenesis-related transcripts in intact and ATRA-treated APL cells and their EVs reveals multiple differences attributable to cellular responses and EV molecular packaging. These observations point to the potential significance of changes in the angiogenic signature and activity associated with EVs released from tumor cells subjected to targeted therapy.

  9. Terra and Aqua MODIS Instrument Performance

    Science.gov (United States)

    Xiong, X.; Angal, A.; Wu, A.; Barnes, W.; Salomonson, V.

    2016-01-01

    Since launch, Terra and Aqua MODIS have produced an unprecedentedly large amount of high quality data products and supported a broad range of applications by the remote sensing science community and users worldwide. Constant and dedicated efforts have been made to continue instrument normal operation, to monitor and characterize changes in sensor responses, and to update calibration parameters to maintain the quality of MODIS data products. This paper provides an overview of instrument operation and calibration activities, and performance. On-orbit changes in sensor responses are illustrated. Also discussed are challenging issues, calibration strategies, and future efforts.

  10. Evaluating Terra MODIS Satellite Sensor Data Products for Maize ...

    African Journals Online (AJOL)

    Celeste

    Evaluating Terra MODIS Satellite Sensor Data Products for Maize. Yield Estimation in South Africa. Celeste ... The Terra (EOS AM-1) research satellite carries the Moderate Resolution Imaging. Spectroradiometer (MODIS) sensor. .... VIS = Visable wavelengths. EVI is computed using this equation (Huete et al, 2002):. [2].

  11. Results of Statewide TerraNova Testing, Fall 1998.

    Science.gov (United States)

    La Marca, Paul M.

    This summary provides key findings about state, district, and school level performance on the TerraNova examinations (CTB/McGraw Hill) in Nevada in 1998-1999. The TerraNova tests are used to assess students in grades 4, 8, and 10 as stipulated by Nevada law. Within this summary, a description of performance as measured by national percentile…

  12. Approaching TERRA Firma: Genomic Functions of Telomeric Noncoding RNA.

    Science.gov (United States)

    Roake, Caitlin M; Artandi, Steven E

    2017-06-29

    Functions of the telomeric repeat-containing RNA (TERRA), the long noncoding RNA (lncRNA) transcribed from telomeres, have eluded researchers. In this issue of Cell, Graf el al. and Chu et al. uncover new regulatory roles for TERRA at the telomere and at distant genomic sites. Copyright © 2017 Elsevier Inc. All rights reserved.

  13. TERRA NEWS: Sensationalism and Fait-divers on the Internet

    Directory of Open Access Journals (Sweden)

    Carlos Golembiewski

    2011-02-01

    Full Text Available This article presents an analysis of the news program Jornal do Terra (Terra News shown on the Terra website. The study involved two aspects: forms of news presentations on TV, based on studies by Pedro Maciel, and criteria of news value, based on Mário Erbolatto’s view. In addition, we used Luis Arthur Ferraretto’s studies of the news formats used specifically on the radio. The objective of this work was to verify what kind of news is transmitted by the news program Terra News, and to compare it with the traditional news program we watch on TV. The study confirmed that Terra News utilizes conventional formats of news presentation and makes a selection of sensationalist news about fait-divers.

  14. Terra News: sensationalism and fait-divers on the Internet

    Directory of Open Access Journals (Sweden)

    Carlos Golembiewski

    2009-12-01

    Full Text Available This article presents an analysis of the news program Jornal do Terra (Terra News shown on the Terra website. The study involved two aspects: forms of news presentations on TV, based on studies by Pedro Maciel, and criteria of news value, based on Mário Erbolatto’s view. In addition, we used Luis Arthur Ferraretto’s studies of the news formats used specifically on the radio. The objective of this work was to verify what kind of news is transmitted by the news program Terra News, and to compare it with the traditional news program we watch on TV. The study confirmed that Terra News utilizes conventional formats of news presentation and makes a selection of sensationalist news about fait-divers.

  15. Role of TERRA in the regulation of telomere length.

    Science.gov (United States)

    Wang, Caiqin; Zhao, Li; Lu, Shiming

    2015-01-01

    Telomere dysfunction is closely associated with human diseases such as cancer and ageing. Inappropriate changes in telomere length and/or structure result in telomere dysfunction. Telomeres have been considered to be transcriptionally silent, but it was recently demonstrated that mammalian telomeres are transcribed into telomeric repeat-containing RNA (TERRA). TERRA, a long non-coding RNA, participates in the regulation of telomere length, telomerase activity and heterochromatinization. The correct regulation of telomere length may be crucial to telomeric homeostasis and functions. Here, we summarize recent advances in our understanding of the crucial role of TERRA in the maintenance of telomere length, with focus on the variety of mechanisms by which TERRA is involved in the regulation of telomere length. This review aims to enable further understanding of how TERRA-targeted drugs can target telomere-related diseases.

  16. Features of Terra Firma-Forme Dermatosis.

    Science.gov (United States)

    Aslan, Nurşad Çifci; Güler, Şükran; Demirci, Kamile; Isiyel, Emel

    2018-01-01

    Terra-firma-forme dermatosis (TFFD) is a little known hyperpigmented skin disease that is more common than expected. We examined retrospectively the medical records of 79 patients: 88.6% were children, the mean age was 10.4 years (SD = 7.5 years), and 64.6% were female. The dermatoses were found on the trunk in 27.8%, extremities in 26.6%, fold zones in 8.9%, and head in 2.5% of the patients. The lesions appeared in more than 1 location in 34.2% of the patients and were symmetrically located 77.2% of the time. Swabbing with alcohol is sufficient for diagnosis and treatment. TFFD, mostly seen in children and female patients, should be kept in mind to avoid unnecessary diagnostic testing and treatment. © 2018 Annals of Family Medicine, Inc.

  17. PAR-TERRA directs homologous sex chromosome pairing.

    Science.gov (United States)

    Chu, Hsueh-Ping; Froberg, John E; Kesner, Barry; Oh, Hyun Jung; Ji, Fei; Sadreyev, Ruslan; Pinter, Stefan F; Lee, Jeannie T

    2017-08-01

    In mammals, homologous chromosomes rarely pair outside meiosis. One exception is the X chromosome, which transiently pairs during X-chromosome inactivation (XCI). How two chromosomes find each other in 3D space is not known. Here, we reveal a required interaction between the X-inactivation center (Xic) and the telomere in mouse embryonic stem (ES) cells. The subtelomeric, pseudoautosomal regions (PARs) of the two sex chromosomes (X and Y) also undergo pairing in both female and male cells. PARs transcribe a class of telomeric RNA, dubbed PAR-TERRA, which accounts for a vast majority of all TERRA transcripts. PAR-TERRA binds throughout the genome, including to the PAR and Xic. During X-chromosome pairing, PAR-TERRA anchors the Xic to the PAR, creating a 'tetrad' of pairwise homologous interactions (Xic-Xic, PAR-PAR, and Xic-PAR). Xic pairing occurs within the tetrad. Depleting PAR-TERRA abrogates pairing and blocks initiation of XCI, whereas autosomal PAR-TERRA induces ectopic pairing. We propose a 'constrained diffusion model' in which PAR-TERRA creates an interaction hub to guide Xic homology searching during XCI.

  18. CTCF driven TERRA transcription facilitates completion of telomere DNA replication.

    Science.gov (United States)

    Beishline, Kate; Vladimirova, Olga; Tutton, Stephen; Wang, Zhuo; Deng, Zhong; Lieberman, Paul M

    2017-12-13

    Telomere repeat DNA forms a nucleo-protein structure that can obstruct chromosomal DNA replication, especially under conditions of replication stress. Transcription of telomere repeats can initiate at subtelomeric CTCF-binding sites to generate telomere repeat-encoding RNA (TERRA), but the role of transcription, CTCF, and TERRA in telomere replication is not known. Here, we have used CRISPR/Cas9 gene editing to mutate CTCF-binding sites at the putative start site of TERRA transcripts for a class of subtelomeres. Under replication stress, telomeres lacking CTCF-driven TERRA exhibit sister-telomere loss and upon entry into mitosis, exhibit the formation of ultra-fine anaphase bridges and micronuclei. Importantly, these phenotypes could be rescued by the forced transcription of TERRA independent of CTCF binding. Our findings indicate that subtelomeric CTCF facilitates telomeric DNA replication by promoting TERRA transcription. Our findings also demonstrate that CTCF-driven TERRA transcription acts in cis to facilitate telomere repeat replication and chromosome stability.

  19. Regime da lei de terras: aspectos atuais

    Directory of Open Access Journals (Sweden)

    Luiz Rodrigues Wambier

    1988-07-01

    Full Text Available The occupation of the Brazilian soil is a matter which still lies at issue and which has brought about extensive and through studies of agrarian doctrine. There have been social and political endeavors aimed at achieving equitable solutions to the problems concerning the implementation of an adequate soil occupation processor And these efforts have naturally had effects upon the activities and decisions of the legislative power in Brazil. In this dissertation it will be seen that land law number 601 which was passed in 1850 represented an attempt to regulate the soil occupation process in Brazil. On the other hand, the comparative study of land laws and the modem agrarian legislation reveals that the legislative solutions have been repeated throughout proportionally to the effects of social pressures upon public power.A questão relativa à ocupação do solo brasileiro, com todos os esforços políticos e sociais, que refletem na elaboração de leis, visando a busca de soluções justas e capazes de viabilizar, de modo o processos de ocupação do país, tem merecido estudos aprofundados da doutrina agrarista. No presente trabalho dissertativo, verificar se que a lei de terras Lei 601, de 1850 -representou um esforço de regularização do processo de ocupação do solo no Brasil Por outro lado, o estudo da lei de terras, comparativamente à legislação agrária moderna, demonstra que as soluções legislativas repetem-se ao longo da história na exata medida em que as pressões sociais repercutem nos poderes públicos.

  20. Rara causa de discapacidad intelectual: síndrome de Coffin Lowry

    Directory of Open Access Journals (Sweden)

    Elibett Carcasés Carcasés

    2015-12-01

    Full Text Available El síndrome de Coffin–Lowry (CLS es una rara forma sindrómica de retardo mental, que muestra una herencia dominante ligada al X. Sus signos principales son el retardo del desarrollo psicomotor y del crecimiento, las dismorfias craneofaciales, las anomalías digitales y las alteraciones esqueléticas progresivas. Se aplicó el método clínico y la técnica comparativa o de patrón para realizar el diagnóstico del CLS en escolar femenina, blanca, de 8 años, que llegó a servicio de Genética remitida de la consulta de Ortopedia, donde era atendida por hiperlaxitud articular y escoliosis. Por su baja frecuencia esta entidad es poco conocida, por lo que resulta interesante la presentación de este caso, identificando las principales manifestaciones clínicas, que permiten un diagnóstico precoz y el manejo adecuado que incluye al paciente y su familia.

  1. Síndrome Williams: una enfermedad rara con sintomatología contradictoria

    Directory of Open Access Journals (Sweden)

    Aníbal Puente Ferreras

    2011-01-01

    Full Text Available El síndrome Williams (SW es una de las enfermedades raras o infrecuentes. Tiene una incidencia de un caso cada 20.000 nacimientos vivos. Se trata de una alteración genética, localizada en el cromosoma 7 (banda 7q11.23, en el 99% de los casos. La alteración genética afecta el desarrollo y el funcionamiento del sistema nervioso central. Esta enfermedad no tiene cura pero se pueden suavizar los síntomas cognitivos, emocionales y sociales. El SW ocurre casi en exclusividad en niñas y de forma excepcional en niños. Los estudios epidemiológicos indican que está presente en todas las etnias, lenguas y culturas. El rango más llamativo de las personas con SW es la discrepancia entre el funcionamiento intelectual general (retraso leve o moderado acompañado de unas habilidades lingüísticas sobresalientes, muy superiores a lo esperado para su edad cronológica y mental. En un porcentaje alto de casos se observan problemas cardiacos, endocrinos, alteraciones del sueño, hiperacusia selectiva y alteraciones en la cognición espacial.

  2. DESHIDROGENACIÓN OXIDATIVA DE PROPANO POR FOSFATOS DE TIERRAS RARAS SOPORTADOS SOBRE PILC-AL

    Directory of Open Access Journals (Sweden)

    Carolina De Los Santos

    2012-01-01

    Full Text Available Se presenta la actividad catalítica en la deshidrogenación oxidativa de propano de diferentes fosfatos de tierra rara LnPO 4 (donde Ln = La, Ce, Pr, Nd, Sm y de los mismos soportados sobre una arcilla pilareada con aluminio de alta superficie específica. Los sólidos fueron caracterizados por ATG, DR X, adsorción de nitrógeno y análisis inmediato post reacción para determinar la eventual formación de carbón superficial. Los ensayos catalíticos usando como mezcla de reacción C 3 H 8 /O 2 /Ar = 10/10/80 se hicieron a temperaturas entre 400ºC y 600ºC. Todos los catalizadores fuer on activos. Los principales productos de reacción fueron: H 2 , CO, CO 2 , CH 4 , C 2 H 4 y C 3 H 6 , no detectándose compuestos orgánicos oxigenados. Aunque todos los sistemas investigados fueron activos, los catalizadores soportados sobre PILC-Al presentaron una actividad mayor que los másicos, siendo el mayor efecto para el samario en que el rendimiento a 600oC aumenta del 4% al 10%. Este efecto fue atribuido al incremento en el área superficial específica.

  3. Caracterização quali-quantitativa dos efluentes gerados no cultuvo intensivo de Litopenaeus vannamei em sistema de bioflocos

    OpenAIRE

    Arantes, Rafael da Fonseca

    2014-01-01

    Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Agrárias, Programa de Pós-Graduação em Aquicultura, Florianópolis, 2014. Determinou-se o efeito de algumas estratégias de manejo do sistema de cultivo de Litopenaeus vannamei com bioflocos sobre o uso da água e o potencial poluidor gerado pelo cultivo. Para isto foram realizados dois experimentos: o primeiro objetivou estudar o efeito de dois métodos de controle de sólidos suspensos totais sobre a qualidade e con...

  4. Effects of livestock on occurrence of the Vulnerable red panda Ailurus fulgens in Rara National Park, Nepal

    OpenAIRE

    Sharma, Hari Prasad; Belant, Jerrold L.; Swenson, Jon

    2014-01-01

    The Vulnerable red panda Ailurus fulgens is endemic to the Himalayas. Anthropogenic activities, including deforestation, have degraded the species’ habitat but the effects of livestock have not been examined. We assessed the effects of illegal livestock activity on the presence of the red panda in Rara National Park, Nepal. The probability of detecting red panda faecal pellets decreased with livestock occurrence but not with elevation or aspect. The presence of bamboo ...

  5. Terra News: sensationalism and fait-divers on the Internet

    OpenAIRE

    Carlos Golembiewski; Diógenes Pandini

    2009-01-01

    This article presents an analysis of the news program Jornal do Terra (Terra News) shown on the Terra website. The study involved two aspects: forms of news presentations on TV, based on studies by Pedro Maciel, and criteria of news value, based on Mário Erbolatto’s view. In addition, we used Luis Arthur Ferraretto’s studies of the news formats used specifically on the radio. The objective of this work was to verify what kind of news is transmitted by the news p...

  6. High-Risk Microgranular Acute Promyelocytic Leukemia with a Five-Way Complex Translocation Involving PML-RARA

    Directory of Open Access Journals (Sweden)

    Benjamin Powers

    2015-01-01

    Full Text Available Acute promyelocytic leukemia (APL is classically characterized by chromosomal translocation (15;17, resulting in the PML-RARA fusion protein leading to disease. Here, we present a case of a 50-year-old man who presented with signs and symptoms of acute leukemia with concern for APL. Therapy was immediately initiated with all-trans retinoic acid. The morphology of his leukemic blasts was consistent with the hypogranular variant of APL. Subsequent FISH and cytogenetic analysis revealed a unique translocation involving five chromosomal regions: 9q34, 17q21, 15q24, 12q13, and 15q26.1. Molecular testing demonstrated PML/RARA fusion transcripts. Treatment with conventional chemotherapy was added and he went into a complete remission. Given his elevated white blood cell count at presentation, intrathecal chemotherapy for central nervous system prophylaxis was also given. The patient remains on maintenance therapy and remains in remission. This is the first such report of a 5-way chromosomal translocation leading to APL. Similar to APL with chromosomal translocations other than classical t(15;17 which result in the typical PML-RARA fusion, our patient responded promptly to an ATRA-containing regimen and remains in complete remission.

  7. Effect of MODIS Terra Radiometric Calibration Improvements on Collection 6 Deep Blue Aerosol Products: Validation and Terra/Aqua Consistency

    Science.gov (United States)

    Sayer, A. M.; Hsu, N. C.; Bettenhausen, C.; Jeong, M.-J.; Meister, G.

    2015-01-01

    The Deep Blue (DB) algorithm's primary data product is midvisible aerosol optical depth (AOD). DB applied to Moderate Resolution Imaging Spectroradiometer (MODIS) measurements provides a data record since early 2000 for MODIS Terra and mid-2002 for MODIS Aqua. In the previous data version (Collection 5, C5), DB production from Terra was halted in 2007 due to sensor degradation; the new Collection 6 (C6) has both improved science algorithms and sensor radiometric calibration. This includes additional calibration corrections developed by the Ocean Biology Processing Group to address MODIS Terra's gain, polarization sensitivity, and detector response versus scan angle, meaning DB can now be applied to the whole Terra record. Through validation with Aerosol Robotic Network (AERONET) data, it is shown that the C6 DB Terra AOD quality is stable throughout the mission to date. Compared to the C5 calibration, in recent years the RMS error compared to AERONET is smaller by approximately 0.04 over bright (e.g., desert) and approximately 0.01-0.02 over darker (e.g., vegetated) land surfaces, and the fraction of points in agreement with AERONET within expected retrieval uncertainty higher by approximately 10% and approximately 5%, respectively. Comparisons to the Aqua C6 time series reveal a high level of correspondence between the two MODIS DB data records, with a small positive (Terra-Aqua) average AOD offset Terra DB AOD data remain stable (to better than 0.01 AOD) throughout the mission to date, suitable for quantitative scientific analyses.

  8. The DNA binding property of PML/RARA but not the integrity of PML nuclear bodies is indispensable for leukemic transformation.

    Directory of Open Access Journals (Sweden)

    Xi Liu

    Full Text Available PML/RARA is the oncoprotein driving acute promyelocytic leukemia (APL. It suppresses genes expression by recruitment of a number of transcriptional repressors, resulting in differentiation block and malignant transformation of hematopoietic cells. Here, we found that mice primary hematopoietic progenitor cells (HPCs, transduced by DNA-binding-defective PML/RARA mutants, were deficient in colony formation. Further experiments showed that DNA-binding-defective PML/RARA mutants could not repress the transcription of retinoic acid regulated genes. Intriguingly, there were no significant differences of the micro-speckled intracellular distribution between the mutants and wild-type PML/RARA. Some retinoic acid target genes regulated by PML/RARA are involved in not only differentiation block but also hematopoietic cell self-renewal. Altogether, our data demonstrate that direct DNA-binding is essential for PML/RARA to immortalize hematopoietic cells, while disruption of PML-nuclear body does not seem to be a prerequisite for hematopoietic cell transformation.

  9. Meet EPA Environmental Engineer Terra Haxton, Ph.D.

    Science.gov (United States)

    EPA Environmental Engineer Terra Haxton, Ph.D., uses computer simulation models to protect drinking water. She investigates approaches to help water utilities be better prepared to respond to contamination incidents in their distribution systems.

  10. TERRA promotes telomerase-mediated telomere elongation in Schizosaccharomyces pombe.

    Science.gov (United States)

    Moravec, Martin; Wischnewski, Harry; Bah, Amadou; Hu, Yan; Liu, Na; Lafranchi, Lorenzo; King, Megan C; Azzalin, Claus M

    2016-07-01

    Telomerase-mediated telomere elongation provides cell populations with the ability to proliferate indefinitely. Telomerase is capable of recognizing and extending the shortest telomeres in cells; nevertheless, how this mechanism is executed remains unclear. Here, we show that, in the fission yeast Schizosaccharomyces pombe, shortened telomeres are highly transcribed into the evolutionarily conserved long noncoding RNA TERRA A fraction of TERRA produced upon telomere shortening is polyadenylated and largely devoid of telomeric repeats, and furthermore, telomerase physically interacts with this polyadenylated TERRA in vivo We also show that experimentally enhanced transcription of a manipulated telomere promotes its association with telomerase and concomitant elongation. Our data represent the first direct evidence that TERRA stimulates telomerase recruitment and activity at chromosome ends in an organism with human-like telomeres. © 2016 The Authors.

  11. MODIS/Terra Granule Level 1B RGB Jpeg image

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOBRGB is a thermal composit Jpeg image product generated using parameters from Terra Level 1B Subsampled Calibrated Radiances product (MOD02SSH). For more...

  12. TerraService.NET: An Introduction to Web Services

    OpenAIRE

    Barclay, Tom; Gray, Jim; Strand, Eric; Ekblad, Steve; Richter, Jeffrey

    2002-01-01

    This article explores the design and construction of a geo-spatial Internet web service application from the host web site perspective and from the perspective of an application using the web service. The TerraService.NET web service was added to the popular TerraServer database and web site with no major structural changes to the database. The article discusses web service design, implementation, and deployment concepts and design guidelines. Web services enable applications that aggregate a...

  13. Functional characterization of the TERRA transcriptome at damaged telomeres.

    Science.gov (United States)

    Porro, Antonio; Feuerhahn, Sascha; Delafontaine, Julien; Riethman, Harold; Rougemont, Jacques; Lingner, Joachim

    2014-10-31

    Telomere deprotection occurs during tumorigenesis and aging upon telomere shortening or loss of the telomeric shelterin component TRF2. Deprotected telomeres undergo changes in chromatin structure and elicit a DNA damage response (DDR) that leads to cellular senescence. The telomeric long noncoding RNA TERRA has been implicated in modulating the structure and processing of deprotected telomeres. Here, we characterize the human TERRA transcriptome at normal and TRF2-depleted telomeres and demonstrate that TERRA upregulation is occurring upon depletion of TRF2 at all transcribed telomeres. TRF2 represses TERRA transcription through its homodimerization domain, which was previously shown to induce chromatin compaction and to prevent the early steps of DDR activation. We show that TERRA associates with SUV39H1 H3K9 histone methyltransferase, which promotes accumulation of H3K9me3 at damaged telomeres and end-to-end fusions. Altogether our data elucidate the TERRA landscape and defines critical roles for this RNA in the telomeric DNA damage response.

  14. Terra - 15 Years as the Earth Observing System Flagship Observatory

    Science.gov (United States)

    Thome, K. J.

    2014-12-01

    Terra marks its 15th year on orbit with an array of accomplishments and the potential to do much more. Efforts continue to extend the Terra data record to make its data more valuable by creating a record length to examine interannual variability, observe trends on the decadal scale, and gather statistics relevant to climate metrics. Continued data from Terra's complementary instruments will play a key role in creating the data record needed for scientists to develop an understanding of our climate system. Terra's suite of instruments: ASTER (contributed by the Japanese Ministry of Economy and Trade and Industry with a JPL-led US Science Team), CERES (NASA LaRC - PI), MISR (JPL - PI), MODIS (NASA GSFC), and MOPITT (sponsored by Canadian Space Agency with NCAR-led Science Team) are providing an unprecedented 81 core data products. The annual demand for Terra data remains with >120 million files distributed in 2011 and >157 million in 2012. More than 1,100 peer-reviewed publications appeared in 2012 using Terra data bringing the lifetime total >7,600. Citation numbers of 21,000 for 2012 and over 100,000 for the mission's lifetime. The power of Terra is in the high quality of the data calibration, sensor characterization, and the complementary nature of the instruments covering a range of scientific measurements as well as scales. The broad range of products enable the community to provide answers to the overarching question, "How is the Earth changing and what are the consequences for life on Earth?" Terra continues to provide data that: (1) Extend the baseline of morning-orbit collections; (2) Enable comparison of measurements acquired from past high-impact events; (3) Add value to recently-launched and soon-to-be launched missions, and upcoming field programs. Terra data continue to support monitoring and relief efforts for natural and man-made disasters that involve U.S. interests. Terra also contributes to Applications Focus Areas supporting the U.S. National

  15. Telomeric repeat-containing RNA (TERRA) constitutes a nucleoprotein component of extracellular inflammatory exosomes.

    Science.gov (United States)

    Wang, Zhuo; Deng, Zhong; Dahmane, Nadia; Tsai, Kevin; Wang, Pu; Williams, Dewight R; Kossenkov, Andrew V; Showe, Louise C; Zhang, Rugang; Huang, Qihong; Conejo-Garcia, José R; Lieberman, Paul M

    2015-11-17

    Telomeric repeat-containing RNA (TERRA) has been identified as a telomere-associated regulator of chromosome end protection. Here, we report that TERRA can also be found in extracellular fractions that stimulate innate immune signaling. We identified extracellular forms of TERRA in mouse tumor and embryonic brain tissue, as well as in human tissue culture cell lines using RNA in situ hybridization. RNA-seq analyses revealed TERRA to be among the most highly represented transcripts in extracellular fractions derived from both normal and cancer patient blood plasma. Cell-free TERRA (cfTERRA) could be isolated from the exosome fractions derived from human lymphoblastoid cell line (LCL) culture media. cfTERRA is a shorter form (∼200 nt) of cellular TERRA and copurifies with CD63- and CD83-positive exosome vesicles that could be visualized by cyro-electron microscopy. These fractions were also enriched for histone proteins that physically associate with TERRA in extracellular ChIP assays. Incubation of cfTERRA-containing exosomes with peripheral blood mononuclear cells stimulated transcription of several inflammatory cytokine genes, including TNFα, IL6, and C-X-C chemokine 10 (CXCL10) Exosomes engineered with elevated TERRA or liposomes with synthetic TERRA further stimulated inflammatory cytokines, suggesting that exosome-associated TERRA augments innate immune signaling. These findings imply a previously unidentified extrinsic function for TERRA and a mechanism of communication between telomeres and innate immune signals in tissue and tumor microenvironments.

  16. BOOK REVIEW: European Perceptions of Terra Australis

    Science.gov (United States)

    Sterken, Christiaan

    2012-12-01

    Terra Australis - the southern land - has been one of the most widespread concepts in European geography from the sixteenth to the eighteenth century. This book comprises a set of 14 interdisciplinary scholarly contributions that deal with personal perceptions of Terra Australis by cartographers and explorers, and with putting these perceptions in their historical and cultural environments. This book seems, at a first glance, to be very remote from astronomy - and even from the history of astronomy - however, as it also offers an excellent background to Captain James Cook's second voyage to observe the 1769 transit of Venus from Tahiti, it definitely is a work of truly interdisciplinary character. Cook's voyages, in fact, became a model in which key scientists of many nationalities and disciplines traveled together on ships. In these voyages, art, science, technology and political power were centralised and united. The chapters range across history, the visual arts, literature, popular culture, technology, politics and science. Issues of scientific reasoning are raised in the description of how people did think about the south before there even existed a perception of the unknown land - quite comparable to how ancient and early-modern astronomers had their thought about cosmology even before any observational data were available. Several early map systems - like the zonal and T-O maps (medieval world maps with the letter T inside an O representing the lands inside a circle of oceans) - are described, and the description of Roman geography shows the amazing fact that theory and practice were not unified, and existed independently of each other insofar that a real paradox between theory and observation had persisted for a very long time. The maps and charts also exemplify the long-lasting consequences of early modern copy-paste practice: navigators copied original sketch charts of coasts that were previously unknown to them, herewith committing many translation and

  17. Rochas-mater da "terra roxa"

    Directory of Open Access Journals (Sweden)

    M. Gutmans

    1943-09-01

    Full Text Available Physico-chemical and mineralogical studies of the soils of the São Paulo State by the Soil Division of The Agronomical Institute proved the existence of different violet soils in South-Brasil and its origin from basaltic rocks. The Brasilian denomination "terra roxa" is already many times translated to "red soil", which is inexact, because the colour "roxa" corresponds to "violet" in English. We must insist on the perfection of Brasilian expression, which gives the shortest and the best characteristic of the true violet soil, derived through the decomposition of basalts and diabases in the São Paulo State. The term "red soil" originated much confusion, because there are in this state many "red soils" of different origins, but the true violet soil is quite unique. The violet colour of this soil appears very beautifully on the clean fields above the diabase hills at the distance of some hundreds of meters. In the state of complete dryness the violet soil becomes coffee brown, but never gets a red colour. The violet soil is the best soil of South America, on the contrary the red soils, which are mostly lateritic, are bad soils. Some exceptions, do exist, of course. The basalts produce laterites and other red soils of better qualities. With the purpose to contribute to the study of the violet and the red soils the present essay was made, describing the basic rocks of South-Brasil, as mother rocks of soils. The basic monograph of Djalma Guimarães "Magmatic Province of South-Brasil" (5, many times mentioned in the petrographic literature, definitively established the principal types and the mineral-components of triassic basic rocks in South-Brasil. We have found some varieties of basic rocks, not ye

  18. Disilicatos de tierras raras simples y sus soluciones sólidas: estructura cristalina y propiedades físicas

    OpenAIRE

    Fernández Carrión, Alberto José

    2014-01-01

    La familia de los disilicatos de tierras raras (de fórmula general RE2Si2O7) exhibe, a presión atmosférica, un elevado polimorfismo con la temperatura (hasta 7 formas diferentes), cuyas estructuras y campos de estabilidad fueron bien definidos por Felsche.[1] Es bien sabido que esta familia de compuestos pueden formar soluciones sólidas entre ellos, de tipo (RE,RE`)2Si2O7, cuyos campos de estabilidad vienen predichos por el criterio del radio.[2] Dicho criterio establece que las regiones de e...

  19. Effect of MODIS Terra Radiometric Calibration Improvements on Collection 6 Deep Blue Aerosol Products: Validation and Terra/Aqua Consistency

    Science.gov (United States)

    Sayer, A. M.; Hsu, N. C.; Bettenhausen, C.; Jeong, M.-J.; Meister, G.

    2015-01-01

    The Deep Blue (DB) algorithm's primary data product is midvisible aerosol optical depth (AOD). DB applied to Moderate Resolution Imaging Spectroradiometer (MODIS) measurements provides a data record since early 2000 for MODIS Terra and mid-2002 for MODIS Aqua. In the previous data version (Collection 5, C5), DB production from Terra was halted in 2007 due to sensor degradation; the new Collection 6 (C6) has both improved science algorithms and sensor radiometric calibration. This includes additional calibration corrections developed by the Ocean Biology Processing Group to address MODIS Terra's gain, polarization sensitivity, and detector response versus scan angle, meaning DB can now be applied to the whole Terra record. Through validation with Aerosol Robotic Network (AERONET) data, it is shown that the C6 DB Terra AOD quality is stable throughout the mission to date. Compared to the C5 calibration, in recent years the RMS error compared to AERONET is smaller by approximately 0.04 over bright (e.g., desert) and approximately 0.01-0.02 over darker (e.g., vegetated) land surfaces, and the fraction of points in agreement with AERONET within expected retrieval uncertainty higher by approximately 10% and approximately 5%, respectively. Comparisons to the Aqua C6 time series reveal a high level of correspondence between the two MODIS DB data records, with a small positive (Terra-Aqua) average AOD offset <0.01. The analysis demonstrates both the efficacy of the new radiometric calibration efforts and that the C6 MODIS Terra DB AOD data remain stable (to better than 0.01 AOD) throughout the mission to date, suitable for quantitative scientific analyses.

  20. Identification of new genomospecies in the Mycobacterium terrae complex.

    Directory of Open Access Journals (Sweden)

    Yun Fong Ngeow

    Full Text Available Members of the Mycobacterium terrae complex are slow-growing, non-chromogenic acid-fast bacilli found in the natural environment and occasionally in clinical material. These genetically closely-related members are difficult to differentiate by conventional phenotypic and molecular tests. In this paper we describe the use of whole genome data for the identification of four strains genetically similar to Mycobacterium sp. JDM601, a newly identified member of the M. terrae complex. Phylogenetic information from the alignment of genome-wide orthologous genes and single nucleotide polymorphisms show consistent clustering of the four strains together with M. sp. JDM601 into a distinct clade separate from other rapid and slow growing mycobacterial species. More detailed inter-strain comparisons using average nucleotide identity, tetra-nucleotide frequencies and analysis of synteny indicate that our strains are closely related to but not of the same species as M. sp. JDM601. Besides the 16S rRNA signature described previously for the M. terrae complex, five more hypothetical proteins were found that are potentially useful for the rapid identification of mycobacterial species belonging to the M. terrae complex. This paper illustrates the versatile utilization of whole genome data for the delineation of new bacterial species and introduces four new genomospecies to add to current members in the M. terrae complex.

  1. Síndrome SAPHO: entidade rara ou subdiagnosticada? SAPHO syndrome: rare or under-diagnosed?

    Directory of Open Access Journals (Sweden)

    Jozephina Gonçalves Guerra

    2005-08-01

    Full Text Available OBJETIVO: Descrever os achados clínicos, radiológicos e patológicos da síndrome SAPHO e sugerir que, apesar de ser considerada rara, esta síndrome deve estar sendo subdiagnosticada por clínicos e radiologistas, provavelmente em função do desconhecimento das suas características. MATERIAIS E MÉTODOS: Foi realizado estudo retrospectivo de seis casos confirmados desta síndrome, dando-se ênfase aos achados clínicos (idade, sexo e sintomas e de imagem (cintilografia óssea, radiografia convencional, tomografia computadorizada e ressonância magnética. RESULTADOS: A manifestação clínica inicial de todos os pacientes foi dor na parede torácica ântero-superior há pelo menos quatro meses. Todos apresentavam achados de imagem de processo inflamatório e/ou osteíte e hiperostose nas articulações da parede torácica ântero-superior. As alterações cutâneas da síndrome, tipo pustulose palmoplantar, estiveram presentes em cinco dos seis pacientes. Em nenhum dos seis casos o diagnóstico foi sugerido na consulta clínica inicial ou na primeira interpretação das imagens feita por radiologistas não especialistas em sistema músculo-esquelético. CONCLUSÃO: Os nossos achados estão de acordo com os descritos na literatura, devendo ser considerado este diagnóstico em todo paciente que apresente quadro doloroso de parede torácica acompanhado de manifestações dermatológicas e/ou osteíte.OBJECTIVE: To describe the clinical, imaging and pathological findings of SAPHO syndrome and to point out that although considered rare this syndrome may be under-diagnosed by clinicians and radiologists, probably due to unfamiliarity with its features. MATERIALS AND METHODS: A retrospective study of six cases diagnosed in the last six years, with emphasis on clinical findings (age, sex and symptoms and imaging findings (bone scintigraphy, conventional x-ray, computed tomography and magnetic resonance imaging was conducted. RESULTS: The initial

  2. TERRA promotes telomere shortening through exonuclease 1-mediated resection of chromosome ends.

    Science.gov (United States)

    Pfeiffer, Verena; Lingner, Joachim

    2012-01-01

    The long noncoding telomeric repeat containing RNA (TERRA) is expressed at chromosome ends. TERRA upregulation upon experimental manipulation or in ICF (immunodeficiency, centromeric instability, facial anomalies) patients correlates with short telomeres. To study the mechanism of telomere length control by TERRA in Saccharomyces cerevisiae, we mapped the transcriptional start site of TERRA at telomere 1L and inserted a doxycycline regulatable promoter upstream. Induction of TERRA transcription led to telomere shortening of 1L but not of other chromosome ends. TERRA interacts with the Exo1-inhibiting Ku70/80 complex, and deletion of EXO1 but not MRE11 fully suppressed the TERRA-mediated short telomere phenotype in presence and absence of telomerase. Thus TERRA transcription facilitates the 5'-3' nuclease activity of Exo1 at chromosome ends, providing a means to regulate the telomere shortening rate. Thereby, telomere transcription can regulate cellular lifespan through modulation of chromosome end processing activities.

  3. Sol-Terra - AN Operational Space Weather Forecasting Model Framework

    Science.gov (United States)

    Bisi, M. M.; Lawrence, G.; Pidgeon, A.; Reid, S.; Hapgood, M. A.; Bogdanova, Y.; Byrne, J.; Marsh, M. S.; Jackson, D.; Gibbs, M.

    2015-12-01

    The SOL-TERRA project is a collaboration between RHEA Tech, the Met Office, and RAL Space funded by the UK Space Agency. The goal of the SOL-TERRA project is to produce a Roadmap for a future coupled Sun-to-Earth operational space weather forecasting system covering domains from the Sun down to the magnetosphere-ionosphere-thermosphere and neutral atmosphere. The first stage of SOL-TERRA is underway and involves reviewing current models that could potentially contribute to such a system. Within a given domain, the various space weather models will be assessed how they could contribute to such a coupled system. This will be done both by reviewing peer reviewed papers, and via direct input from the model developers to provide further insight. Once the models have been reviewed then the optimal set of models for use in support of forecast-based SWE modelling will be selected, and a Roadmap for the implementation of an operational forecast-based SWE modelling framework will be prepared. The Roadmap will address the current modelling capability, knowledge gaps and further work required, and also the implementation and maintenance of the overall architecture and environment that the models will operate within. The SOL-TERRA project will engage with external stakeholders in order to ensure independently that the project remains on track to meet its original objectives. A group of key external stakeholders have been invited to provide their domain-specific expertise in reviewing the SOL-TERRA project at critical stages of Roadmap preparation; namely at the Mid-Term Review, and prior to submission of the Final Report. This stakeholder input will ensure that the SOL-TERRA Roadmap will be enhanced directly through the input of modellers and end-users. The overall goal of the SOL-TERRA project is to develop a Roadmap for an operational forecast-based SWE modelling framework with can be implemented within a larger subsequent activity. The SOL-TERRA project is supported within

  4. Co-operative leukemogenesis in acute myeloid leukemia and acute promyelocytic leukemia reveals C/EBPα as a common target of TRIB1 and PML/RARA.

    Science.gov (United States)

    Keeshan, Karen; Vieugué, Pauline; Chaudhury, Shahzya; Rishi, Loveena; Gaillard, Coline; Liang, Lu; Garcia, Elaine; Nakamura, Takuro; Omidvar, Nader; Kogan, Scott C

    2016-10-01

    The PML/RARA fusion protein occurs as a result of the t(15;17) translocation in the acute promyelocytic leukemia subtype of human acute myeloid leukemia. Gain of chromosome 8 is the most common chromosomal gain in human acute myeloid leukemia, including acute promyelocytic leukemia. We previously demonstrated that gain of chromosome 8-containing MYC is of central importance in trisomy 8, but the role of the nearby TRIB1 gene has not been experimentally addressed in this context. We have now tested the hypothesis that both MYC and TRIB1 have functional roles underlying leukemogenesis of trisomy 8 by using retroviral vectors to express MYC and TRIB1 in wild-type bone marrow and in marrow that expressed a PML/RARA transgene. Interestingly, although MYC and TRIB1 readily co-operated in leukemogenesis for wild-type bone marrow, TRIB1 provided no selective advantage to cells expressing PML/RARA. We hypothesized that this lack of co-operation between PML/RARA and TRIB1 reflected a common pathway for their effect: both proteins targeting the myeloid transcription factor C/EBPα. In support of this idea, TRIB1 expression abrogated the all-trans retinoic acid response of acute promyelocytic leukemia cells in vitro and in vivo Our data delineate the common and redundant inhibitory effects of TRIB1 and PML/RARA on C/EBPα providing a potential explanation for the lack of selection of TRIB1 in human acute promyelocytic leukemia, and highlighting the key role of C/EBPs in acute promyelocytic leukemia pathogenesis and therapeutic response. In addition, the co-operativity we observed between MYC and TRIB1 in the absence of PML/RARA show that, outside of acute promyelocytic leukemia, gain of both genes may drive selection for trisomy 8. Copyright© Ferrata Storti Foundation.

  5. Quantitative interaction screen of telomeric repeat-containing RNA reveals novel TERRA regulators.

    Science.gov (United States)

    Scheibe, Marion; Arnoult, Nausica; Kappei, Dennis; Buchholz, Frank; Decottignies, Anabelle; Butter, Falk; Mann, Matthias

    2013-12-01

    Telomeres are actively transcribed into telomeric repeat-containing RNA (TERRA), which has been implicated in the regulation of telomere length and heterochromatin formation. Here, we applied quantitative mass spectrometry (MS)-based proteomics to obtain a high-confidence interactome of TERRA. Using SILAC-labeled nuclear cell lysates in an RNA pull-down experiment and two different salt conditions, we distinguished 115 proteins binding specifically to TERRA out of a large set of background binders. While TERRA binders identified in two previous studies showed little overlap, using quantitative mass spectrometry we obtained many candidates reported in these two studies. To test whether novel candidates found here are involved in TERRA regulation, we performed an esiRNA-based interference analysis for 15 of them. Knockdown of 10 genes encoding candidate proteins significantly affected total cellular levels of TERRA, and RNAi of five candidates perturbed TERRA recruitment to telomeres. Notably, depletion of SRRT/ARS2, involved in miRNA processing, up-regulated both total and telomere-bound TERRA. Conversely, knockdown of MORF4L2, a component of the NuA4 histone acetyltransferase complex, reduced TERRA levels both globally and for telomere-bound TERRA. We thus identified new proteins involved in the homeostasis and telomeric abundance of TERRA, extending our knowledge of TERRA regulation.

  6. Development of vertical drilling apparatus (Terra-Drill); Entwicklung eines Vertikal-Bohrgeraets (Terra-Drill) - Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Jenne, D.

    2009-05-15

    This well-illustrated final report for the Swiss Federal Office of Energy (SFOE) reports on the development of a vertical drilling apparatus named Terra-Drill. The various stages of the development of the apparatus, which is based on earlier designs, is discussed. New norms issued in Germany for the size of boreholes for buried vertical heat-exchangers and the appropriate linings to be used are discussed. The new Terra Drill 4407 V drilling apparatus and its testing are discussed. The drill is quoted as being particularly suitable for cramped locations. Technical details are presented and a comprehensive collection of photographs is included. Various preliminary reports and development documentation are included.

  7. Terra-Acqua, adaptable definition and execution of workflows

    Directory of Open Access Journals (Sweden)

    Genoveva Vargas S.

    2004-01-01

    Full Text Available Este trabajo presenta TERRA y ACQUA, dos mecanismos que dan soporte a la definición y ejecución adaptables de flujos de trabajo. Dando una especificación de un proceso como flujo de trabajo (actividades, flujo, agentes y comportamiento TERRA genera un grafico representando el flujo de trabajo. Dicho grafico es utilizado para verificar que la estructura sea la correcta y la terminación de una especificación de flujo de trabajo. Una vez verificada TERRA genera y almacena las estructuras (objetos, eventos, reacciones necesarias para ejecutar un flujo de trabajo. ACQUA ejecuta flujos de trabajo de acuerdo a un modelo paramétrico de comportamiento que representa las políticas de ejecución de flujos de trabajo en términos de dimensiones asociadas a valores. ACQUA esta soportado por mecanismos de comunicación basados en eventos para interactuar con agentes que participan en la ejecución de actividades de flujo de trabajo. Finalmente TERRA y ACQUA ofrecen mecanismos para modificar la estructura de un flujo de trabajo y su comportamiento asociado.

  8. Mucilaginibacter terrae sp nov., isolated from Antarctic soil

    Czech Academy of Sciences Publication Activity Database

    Sedláček, I.; Pantůček, R.; Králová, S.; Mašlaňová, I.; Holochová, P.; Staňková, E.; Sobotka, Roman; Barták, M.; Busse, H.-J.; Švec, P.

    2017-01-01

    Roč. 67, č. 10 (2017), s. 4002-4007 ISSN 1466-5026 R&D Projects: GA MŠk(CZ) LO1416 Institutional support: RVO:61388971 Keywords : Mucilaginibacter terrae sp nov. * James ross island * Antarctic Subject RIV: EE - Microbiology, Virology Impact factor: 2.134, year: 2016

  9. Assessing Terra Disposal Orbit Candidates from an Orbital Debris Perspective

    Science.gov (United States)

    Abraham, Andrew J.; Thompson, Roger C.; Mantziaras, Dimitrios C.

    2016-01-01

    The NASA Terra satellite is reaching the end of its mission life. Because the satellite resides in the 705 km Earth Science Constellation, disposal strategies need to be considered to remove it from this densely populated operational orbit. Of critical importance was the need to examine the future potential risk to other satellite residents of the 705 km constellation due to an unexpected breakup event of the Terra satellite post-disposal. This study quantifies the comparative risk of debris impacts associated with the two leading candidate disposal orbits (701 km vs. 686 km) and characterizes the suitability of each orbit for the purpose of long-term spacecraft disposal. The increase in collision risk to any member of the 705 km Earth Science Constellation is very modest. The long-term, average, total risk (including the ambient background risk) due to a Terra breakup at a disposal of -19 km (i.e., 686 km) relative to the 705 km constellation is 9.7 × 10(exp -6) impacts/day versus 1.0 × 10(exp -5) impacts/day for a disposal of only -4 km (i.e., 701 km). For perspective, note that the nominal space background risk to the 705 km constellation is 9.2 × 10(exp -6) impacts/day which implies a very modest increase in risk (approximately 3% difference between the two cases) due to a Terra breakup in either disposal orbit.

  10. Micropropagation of Anthurium andreanum cv. Terra | Farsi | African ...

    African Journals Online (AJOL)

    Anthurium anderanum cv. Terra from family Araceae, is a plant with a high commercial value. Conventional propagation of this plant performed via suckers and seeds planting that nowadays missed its application have been abolished. This study aimed to establish producible protocol for indirect in vitro regeneration of the ...

  11. SITE TECHNOLOGY CAPSULE: TERRA-KLEEN SOLVENT EXTRACTION TECHNOLOGY

    Science.gov (United States)

    Remediation of PCBs in soils has been difficult to implement on a full-scale, cost-effective basis. The Terra-Kleen solvent extraction system has overcome many of the soil handling, contaminant removal, and regulatory restrictions that have made it difficult to implement a cost-e...

  12. Telomeric Repeat Containing RNA (TERRA): Aging and Cancer.

    Science.gov (United States)

    Sinha, Sonam; Shukla, Samriddhi; Khan, Sajid; Farhan, Mohammad; Kamal, Mohammad Amjad; Meeran, Syed Musthapa

    2015-01-01

    Telomeric repeat containing RNAs (TERRA) are small RNA molecules synthesized from telomeric regions which were previously considered as silent genomic domains. In normal cells, these RNAs are transcribed in a direction from subtelomeric region towards the chromosome ends, but in case of cancer cells, their expression remains limited or absent. Telomerase is a rate limiting enzyme for cellular senescence, cancer and aging. Most of the studies deal with the manipulation of telomerase enzyme in cancer and aging either by synthetic oligonucleotide or by natural phytochemicals. Here, we collected evidences and discussed intensely about the bio-molecular structure of TERRA, naturally occurring ligands of telomerase, and their genetic and epigenetic regulations in aging associated diseases. Due to their capability to act as naturally occurring ligands of telomerase, these RNAs can overcome the limitations possessed by synthetic oligonucleotides, which are aimed against telomerase. Drugs specifically targeting TERRA molecules could modulate telomerase-mediated telomere lengthening. Thus, targeting TERRA-mediated regulation of telomerase would be a promising therapeutic strategy against cancer and age-associated diseases.

  13. Evaluating Terra MODIS Satellite Sensor Data Products for Maize ...

    African Journals Online (AJOL)

    The Free State Province of the Republic of South Africa contains some of the most important maize-producing areas in South Africa. For this reason this province has also been selected as a Joint Experiment for Crop Assessment and Monitoring (JECAM, 2012) site representative of South Africa. The Terra (EOS AM-1) ...

  14. Identification of chromatin marks at TERRA promoter and encoding region.

    Science.gov (United States)

    Negishi, Yutaka; Kawaji, Hideya; Minoda, Aki; Usui, Kengo

    2015-11-27

    TERRA is a long non-coding RNA that is essential for telomere integrity. Although it is transcribed from subtelomeres and telomeres, how it is expressed in heterochromatic region is currently unknown. In this study, we focused our analysis on TERRA-encoding region TelBam3.4 and TelBam3.4-like sequences, and determined their transcription start sites, as well as enrichment of RNA polymerase II and histone modifications. We found that H3K4me3 and H3K9me3 are present at TERRA promoters, whereas H3K27ac and H3K9me3 are present at telomeric repeats. Consistently, we show that presence of active histone modifications H3K4me3 and H3K27ac are correlated to TERRA expression. These results mark an important step towards understanding telomere maintenance and transcription. Copyright © 2015 The Authors. Published by Elsevier Inc. All rights reserved.

  15. Terra Vac In Situ Vacuum Extraction System: Applications Analysis Report

    Science.gov (United States)

    This document is an evaluation of the Terra Vac in situ vacuum extraction system and its applicability as a treatment method for waste site cleanup. This report analyzes the results from the Superfund Innovative Technology Evaluation (SITE) Program’s 56-day demonstration at t...

  16. Síndrome de Churg Strauss: uma vasculite rara Churg strauss Syndrome: a rare vasculitis

    Directory of Open Access Journals (Sweden)

    Luciana Calvo Mardegan

    2004-04-01

    Full Text Available O objetivo deste trabalho é avaliar as características demográficas, clínicas, laboratoriais e histopatológica de pacientes com diagnóstico de síndrome de Churg Strauss (SCS acompanhados no ambulatório de vasculites do Hospital das Clínicas da Universidade Estadual de Campinas (HC/Unicamp. Foi realizado estudo retrospectivo dos prontuários dos pacientes com vasculite primária, classificados como SCS pelos critérios do American College of Rheumathology (ACR. Foram observados cinco pacientes com diagnóstico de SCS (M/F:3/2, caucasóides. A média de idade do início da doença foi 46 anos (40-55. A média de tempo de seguimento foi de 2,37 anos (0,25-6. Sintomas sistêmicos, asma, neuropatia periférica e lesão cutânea foram observados em todos os pacientes. Envolvimento cardiovascular, renal e de trato gastrintestinal estiveram presentes cada qual em um paciente. Todos os pacientes apresentaram eosinofilia (>10%,e o p-ANCA foi positivo nos três casos investigados. A radiografia de tórax revelou infiltrado pulmonar intersticial em dois casos; em um, associado à derrame pleural. Na histopatologia, evidências de eosinófilos extravascular foram encontradas nas biópsias cutâneas de 3/4 pacientes. Todos os pacientes foram tratados com prednisona. Em 3, houve a necessidade de associar-se imunossupressor. Nenhum paciente evoluiu a óbito. A SCS é uma patologia rara, com acometimento sistêmico, sendo a asma uma das principais e mais precoce manifestação. Todos os pacientes apresentaram sintomas sistêmicos, acometimento de pele e sistema nervoso periférico. Envolvimento renal, cardíaco e gastrointestinal foi observado, cada qual em um único paciente, diferindo de outras séries nas quais esses acometimentos são mais freqüentes. Embora seja uma patologia grave e de prognóstico reservado, observamos evolução favorável com tratamento.The aim of this report is to verify the demographic, clinical, laboratorial and

  17. Evidence for regulated expression of Telomeric Repeat-containing RNAs (TERRA) in parasitic trypanosomatids.

    Science.gov (United States)

    Damasceno, Jeziel D; Silva, Gabriel LA; Tschudi, Christian; Tosi, Luiz Ro

    2017-08-01

    The Telomeric Repeat-containing RNAs (TERRA) participate in the homeostasis of telomeres in higher eukaryotes. Here, we investigated the expression of TERRA in Leishmania spp. and Trypanosoma brucei and found evidences for its expression as a specific RNA class. The trypanosomatid TERRA are heterogeneous in size and partially polyadenylated. The levels of TERRA transcripts appear to be modulated through the life cycle in both trypanosomatids investigated, suggesting that TERRA play a stage-specific role in the life cycle of these early-branching eukaryotes.

  18. Tumor cardiaco en un paciente de mediana edad con enfermedad coronaria - una rara asociación

    Directory of Open Access Journals (Sweden)

    Ricardo P Silva

    2013-08-01

    Full Text Available Se describe una rara asociación de tumor cardíaco y enfermedad coronaria. Un varón de 42 años de edad fue admitido con queja de disnea. El electrocardiograma mostró ritmo sinusal, bloqueo de rama derecha y repolarización anormal de la pared ventricular anterior. El ecocardiograma mostró una estructura con ecogenicidad aumentada dentro de la aurícula izquierda, compatible con tumor cardíaco. El paciente fue enviado a cirugía; se estabilizó y fue dado de alta en el cuarto día post-operatorio sin complicaciones y sin síntomas.

  19. Tumor cardiaco en un paciente de mediana edad con enfermedad coronaria – una rara asociación

    Directory of Open Access Journals (Sweden)

    Ricardo P. Silva, MD., PhD.

    2013-07-01

    Full Text Available Se describe una rara asociación de tumor cardíaco y enfermedad coronaria. Un varón de 42 años de edad fue admitido con queja de disnea. El electrocardiograma mostró ritmo sinusal, bloqueo de rama derecha y repolarización anormal de la pared ventricular anterior. El ecocardiograma mostró una estructura con ecogenicidad aumentada dentro de la aurícula izquierda, compatible con tumor cardíaco. El paciente fue enviado a cirugía; se estabilizó y fue dado de alta en el cuarto día post-operatorio sin complicaciones y sin síntomas.

  20. De rara avis a referéndum: El fenómeno de los latinismos en la prensa venezolana

    Directory of Open Access Journals (Sweden)

    Valentina Truneanu

    2005-09-01

    Full Text Available La presencia de latinismos es común y fructífera en el discurso periodístico, el cual cuenta con expresiones como rara avis, modus operandi, grosso modo y referéndum. El objetivo de esta investigación consistió en analizar morfológica y semánticamente los latinismos empleados en la prensa venezolana, para lo cual se estudió una muestra extraída del diario El Universal. Los resultados obtenidos demuestran la aparición de latinismos en casi todas las secciones del periódico, las vacilaciones de los periodistas en torno a la ortografía, plurales y acentos, y los cambios entre el significado literal de la expresión latina y su significado en contexto.

  1. El uso de Facebook en asociaciones españolas de enfermedades raras: ¿cómo y para qué lo utilizan?

    Directory of Open Access Journals (Sweden)

    Manuel Armayones

    2015-09-01

    Conclusiones: La alineación entre los intereses de las asociaciones a través de su presencia en Facebook y los ámbitos de actuación de la estrategia nacional de enfermedades raras permite ser optimistas sobre la viabilidad de utilizar Facebook como espacio de encuentro y trabajo colaborativo.

  2. TERRA Promotes Telomere Shortening through Exonuclease 1–Mediated Resection of Chromosome Ends

    Science.gov (United States)

    Pfeiffer, Verena; Lingner, Joachim

    2012-01-01

    The long noncoding telomeric repeat containing RNA (TERRA) is expressed at chromosome ends. TERRA upregulation upon experimental manipulation or in ICF (immunodeficiency, centromeric instability, facial anomalies) patients correlates with short telomeres. To study the mechanism of telomere length control by TERRA in Saccharomyces cerevisiae, we mapped the transcriptional start site of TERRA at telomere 1L and inserted a doxycycline regulatable promoter upstream. Induction of TERRA transcription led to telomere shortening of 1L but not of other chromosome ends. TERRA interacts with the Exo1-inhibiting Ku70/80 complex, and deletion of EXO1 but not MRE11 fully suppressed the TERRA–mediated short telomere phenotype in presence and absence of telomerase. Thus TERRA transcription facilitates the 5′-3′ nuclease activity of Exo1 at chromosome ends, providing a means to regulate the telomere shortening rate. Thereby, telomere transcription can regulate cellular lifespan through modulation of chromosome end processing activities. PMID:22719262

  3. Telomeric noncoding RNA TERRA is induced by telomere shortening to nucleate telomerase molecules at short telomeres.

    Science.gov (United States)

    Cusanelli, Emilio; Romero, Carmina Angelica Perez; Chartrand, Pascal

    2013-09-26

    Elongation of a short telomere depends on the action of multiple telomerase molecules, which are visible as telomerase RNA foci or clusters associated with telomeres in yeast and mammalian cells. How several telomerase molecules act on a single short telomere is unknown. Herein, we report that the telomeric noncoding RNA TERRA is involved in the nucleation of telomerase molecules into clusters prior to their recruitment at a short telomere. We find that telomere shortening induces TERRA expression, leading to the accumulation of TERRA molecules into a nuclear focus. Simultaneous time-lapse imaging of telomerase RNA and TERRA reveals spontaneous events of telomerase nucleation on TERRA foci in early S phase, generating TERRA-telomerase clusters. This cluster is subsequently recruited to the short telomere from which TERRA transcripts originate during S phase. We propose that telomere shortening induces noncoding RNA expression to coordinate the recruitment and activity of telomerase molecules at short telomeres. Copyright © 2013 Elsevier Inc. All rights reserved.

  4. Pirólise de resíduos poliméricos gerados por atividades offshore Pyrolysis of offshore solid wastes

    Directory of Open Access Journals (Sweden)

    Mara L. de Oliveira

    2009-01-01

    Full Text Available Resíduos plásticos gerados pelas atividades offshore da indústria de exploração e produção de óleo e gás, após caracterização por ensaio de identificação das classes poliméricas e análise térmica, foram pirolisados em atmosfera inerte a 450 °C. Os óleos pirolíticos foram caracterizados por espectrofotometria de infravermelho por transformada de Fourier (FTIR e cromatografia em fase gasosa acoplada à espectrometria de massas (CG/EM, indicando a composição de parafinas, olefinas e aromáticos.Solid wastes from oil and gas offshore exploration and production activities, after characterization of polymeric classes and thermal identification analysis tests, were pyrolysed under an inert atmosphere at 450 °C. The pyrolysis oil was characterized by Fourier Transform Infrared Spectroscopy (FTIR gas chromatography mass spectrometry (CG/EM, indicating high generation of paraffin, olefines and aromatics.

  5. Evaluating frequency of PML-RARA mutations and conferring resistance to arsenic trioxide-based therapy in relapsed acute promyelocytic leukemia patients.

    Science.gov (United States)

    Lou, Yinjun; Ma, Yafang; Sun, Jianai; Ye, Xiujin; Pan, Hanzhang; Wang, Yungui; Qian, Wenbin; Meng, Haitao; Mai, Wenyuan; He, JingSong; Tong, Hongyan; Jin, Jie

    2015-11-01

    The aim of the study is to better understand the mechanism of relapse and acquired clinical resistance to arsenic trioxide (ATO) and/or all-trans retinoic acid (ATRA). Thirty relapsed acute promyelocytic leukemia (APL) patients were followed. Fifteen patients experienced two or more relapses; nine patients had clinical resistance to ATO-based therapy. The frequency and clinical significance of promyelocytic leukemia (PML)-retinoic acid receptor alpha (RARA) mutational status using Sanger sequencing were evaluated. Overall, eight different types of mutations in the RARA region (V218D, R272Q, T278A, T291I, N299D, R294W, A300G, and L220_F228delinsP) were identified in 11 patients. Eight missense mutations (L211P, C213R, S214L, A216V, L217F, D219H, S221G, and D241G) were found in the PML portion of PML-RARA in 14 patients, with A216V as the predominant mutation. Eight patients were found to harbor both PML and RARA mutations over the course of the disease. The PML-region mutations were associated with response to ATO-based therapy (P < 0.0001), number of relapses (P = 0.001), and early relapse (P = 0.013). Notably, one case sampled at nine different time points showed alternating clonal dominance over the course of treatment. This study demonstrated frequent mutations of PML-RARA and supported a clonal selection model in relation to APL relapse and ATO resistance.

  6. TERRA: efficient video mark-up and analytics

    Science.gov (United States)

    Doig, P. A.; Hickman, D.; Nottage, G.; Page, S.

    2011-06-01

    This paper describes the ongoing development of the TERRA(TM) (Timeline Editing for Real-time Review and Analysis) application by Waterfall Solutions Ltd. (WS), which is a high-throughput video analytics tool designed to be highly flexible to user requirements. One of the known pitfalls associated with video analytics is the lack of sufficient user interaction within existing systems, often leading to system unreliability due to an unacceptably high level of false alarms. Therefore, instead of aiming to produce a fully automated system, TERRA(TM) emphasises the importance of having a human user in the loop, and consequently concentrates on providing information in the most intuitive and efficient a manner possible.

  7. Metamasius hemipterus L. como praga de bananeiras cv. Terra

    Directory of Open Access Journals (Sweden)

    Marilene Fancelli

    2012-09-01

    Full Text Available Metamasius spp. não é citado como praga da bananeira. Entretanto, o manejo cultural adotado nos bananais pode interferir na ocorrência desses insetos. Este trabalho foi realizado com o objetivo de registrar a ocorrência de Metamasius hemipterus L.. em bananal orgânico cv. Terra e seus danos em uma área experimental e de produção no município de Presidente Tancredo Neves, Bahia. Relata-se a ocorrência de M. hemipterus como praga da bananeira cv. Terra. Alerta-se para a necessidade de monitoramento do inseto principalmente em sistemas de produção orgânica.

  8. Summary of Terra and Aqua MODIS Long-Term Performance

    Science.gov (United States)

    Xiong, Xiaoxiong (Jack); Wenny, Brian N.; Angal, Amit; Barnes, William; Salomonson, Vincent

    2011-01-01

    Since launch in December 1999, the MODIS ProtoFlight Model (PFM) onboard the Terra spacecraft has successfully operated for more than 11 years. Its Flight Model (FM) onboard the Aqua spacecraft, launched in May 2002, has also successfully operated for over 9 years. MODIS observations are made in 36 spectral bands at three nadir spatial resolutions and are calibrated and characterized regularly by a set of on-board calibrators (OBC). Nearly 40 science products, supporting a variety of land, ocean, and atmospheric applications, are continuously derived from the calibrated reflectances and radiances of each MODIS instrument and widely distributed to the world-wide user community. Following an overview of MODIS instrument operation and calibration activities, this paper provides a summary of both Terra and Aqua MODIS long-term performance. Special considerations that are critical to maintaining MODIS data quality and beneficial for future missions are also discussed.

  9. Supervolcanoes Within an Ancient Volcanic Province in Arabia Terra, Mars

    Science.gov (United States)

    Michalski, Joseph. R.; Bleacher, Jacob E.

    2014-01-01

    Several irregularly shaped craters located within Arabia Terra, Mars represent a new type of highland volcanic construct and together constitute a previously unrecognized martian igneous province. Similar to terrestrial supervolcanoes, these low-relief paterae display a range of geomorphic features related to structural collapse, effusive volcanism, and explosive eruptions. Extruded lavas contributed to the formation of enigmatic highland ridged plains in Arabia Terra. Outgassed sulfur and erupted fine-grained pyroclastics from these calderas likely fed the formation of altered, layered sedimentary rocks and fretted terrain found throughout the equatorial region. Discovery of a new type of volcanic construct in the Arabia volcanic province fundamentally changes the picture of ancient volcanism and climate evolution on Mars. Other eroded topographic basins in the ancient Martian highlands that have been dismissed as degraded impact craters should be reconsidered as possible volcanic constructs formed in an early phase of widespread, disseminated magmatism on Mars.

  10. Geological Mapping of the Lada Terra (V-56) Quadrangle, Venus

    Science.gov (United States)

    Kumar, P. Senthil; Head, James W., III

    2009-01-01

    Geological mapping of the V-56 quadrangle (Fig. 1) reveals various tectonic and volcanic features and processes in Lada Terra that consist of tesserae, regional extensional belts, coronae, volcanic plains and impact craters. This study aims to map the spatial distribution of different material units, deformational features or lineament patterns and impact crater materials. In addition, we also establish the relative age relationships (e.g., overlapping or cross-cutting relationship) between them, in order to reconstruct the geologic history. Basically, this quadrangle addresses how coronae evolved in association with regional extensional belts, in addition to evolution of tesserae, regional plains and impact craters, which are also significant geological units of Lada Terra.

  11. Blob tectonics - A prediction for Western Aphrodite Terra, Venus

    Science.gov (United States)

    Herrick, Robert R.; Phillips, Roger J.

    1990-01-01

    It is proposed that the Western Aphrodite Terra region of Venus was formed by four diapirs of heated mantle material, or blobs, rising to the surface in a region of convective upwelling. The four blobs are in different stages of evolution, producing different topography, gravity anomalies, and morphology. It is shown that this model is consistent with available data and make specific predictions that can be tested with Magellan radar data.

  12. Terra MODIS Band 27 Electronic Crosstalk Effect and Its Removal

    Science.gov (United States)

    Sun, Junqiang; Xiong, Xiaoxiong; Madhavan, Sriharsha; Wenny, Brian

    2012-01-01

    The MODerate-resolution Imaging Spectroradiometer (MODIS) is one of the primary instruments in the NASA Earth Observing System (EOS). The first MODIS instrument was launched in December, 1999 on-board the Terra spacecraft. MODIS has 36 bands, covering a wavelength range from 0.4 micron to 14.4 micron. MODIS band 27 (6.72 micron) is a water vapor band, which is designed to be insensitive to Earth surface features. In recent Earth View (EV) images of Terra band 27, surface feature contamination is clearly seen and striping has become very pronounced. In this paper, it is shown that band 27 is impacted by electronic crosstalk from bands 28-30. An algorithm using a linear approximation is developed to correct the crosstalk effect. The crosstalk coefficients are derived from Terra MODIS lunar observations. They show that the crosstalk is strongly detector dependent and the crosstalk pattern has changed dramatically since launch. The crosstalk contributions are positive to the instrument response of band 27 early in the mission but became negative and much larger in magnitude at later stages of the mission for most detectors of the band. The algorithm is applied to both Black Body (BB) calibration and MODIS L1B products. With the crosstalk effect removed, the calibration coefficients of Terra MODIS band 27 derived from the BB show that the detector differences become smaller. With the algorithm applied to MODIS L1B products, the Earth surface features are significantly removed and the striping is substantially reduced in the images of the band. The approach developed in this report for removal of the electronic crosstalk effect can be applied to other MODIS bands if similar crosstalk behaviors occur.

  13. [Clinicopathological aspects of terra firma-forme dermatosis].

    Science.gov (United States)

    Gusdorf, L; Cribier, B

    2016-01-01

    Terra firma-forme dermatosis was first described in 1987. It is characterized by the appearance in children or adolescents of dirt-like patches despite normal cleansing. The lesions are removed when the skin is rubbed with a 70°C alcohol swab. This largely unknown condition is of uncertain origin but could be due to a keratinisation disorder. Herein we report the case of a 17-year-old male patient who, after seeking the opinions of a number of doctors, consulted in dermatology for multiple pigmented patches on the trunk and limbs that had appeared one year earlier. These lesions had persisted despite appropriate cleansing. He had no history of endocrine disorders and no familial history of pigmentation disorders. A skin biopsy revealed compact orthokeratotic hyperkeratosis resembling a second layer of stratum corneum on top of a normal layer. Very small granules were seen within this layer and PAS staining revealed spores. These skin lesions disappeared when rubbed with an alcohol swab, resulting in a diagnosis of terra firma-forme dermatosis. Where a diagnosis of terra firma-forme dermatosis is suspected, confirmation is easy to obtain using an alcohol swab. Nevertheless, the disease is not familiar to dermatologists. The most common differential diagnoses are acanthosis nigricans, reticulate and confluent papillomatosis, and Dowling-Degos disease. Their histopathological appearances are very different and skin biopsy can be useful for diagnosis. These entities belong to a group of disorders involving abnormal keratinisation and pigmentation. Anatomoclinical correlation is essential for optimal management. The appearance of the stratum corneum may play an important role in the diagnosis of terra firma-forme dermatosis. Copyright © 2016 Elsevier Masson SAS. All rights reserved.

  14. Geologic map of the Lada Terra quadrangle (V-56), Venus

    Science.gov (United States)

    Kumar, P. Senthil; Head, James W.

    2013-01-01

    This publication provides a geological map of Lada Terra quadrangle (V–56), a portion of the southern hemisphere of Venus that extends from lat 50° S. to 70° S. and from long 0° E. to 60° E. V–56 is bordered by Kaiwan Fluctus (V–44) and Agnesi (V–45) quadrangles in the north and by Mylitta Fluctus (V–61), Fredegonde (V–57), and Hurston (V–62) quadrangles in the west, east, and south, respectively. The geological map of V–56 quadrangle reveals evidence for tectonic, volcanic, and impact processes in Lada Terra in the form of tesserae, regional extensional belts, coronae, and volcanic plains. In addition, the map also shows relative age relations such as overlapping or cross-cutting relations between the mapped geologic units. The geology observed within this quadrangle addresses (1) how coronae evolved in association with regional extensional belts and (2) how tesserae, regional plains, and impact craters, which are also significant geological units observed in Lada Terra quadrangle, were formed.

  15. Sedimentary strata in the southern highlands of Noachis Terra, Mars

    Science.gov (United States)

    Fenton, L. K.

    2005-12-01

    The sedimentary history of Mars is one of the fundamental problems that needs to be understood in order to determine the role of the atmosphere, climate, and water in sculpting the martian surface. To begin addressing this issue, a number of sedimentary strata, some up to several hundreds of meters thick, have been studied in the southern highlands of Mars using THEMIS VIS and IR (both day and night) images. A sequence of sedimentary units was found in a pit eroded into the floor of Rabe Crater (35° E, 44° S), some of which appear to be shedding dark sand that feeds into the Rabe Crater dune field. The visible and thermal characteristics of these units are similar to other units found across Noachis Terra (which extends from 0°-60° E, 30°-65° S, and includes Rabe Crater), leading to the hypothesis that a series of region-wide depositional events occurred at some point in the martian past, and that these deposits are currently exposed by erosion in pits on crater floors and possibly on the intercrater plains separating the craters. Some of these sedimentary units may consitute a source of sand for the many intracrater dune fields in Noachis Terra, eroding from a widespread source that outcrops locally. Sand-bearing layers that extend across all or part of Noachis Terra are not likely to be dominated by loess or lacustrine deposits; glacial and/or volcanic origins are more plausible.

  16. Projeto de aterramento para sistema monofilar com retorno pelo terra Grounding project for single wire earth return system

    Directory of Open Access Journals (Sweden)

    Humberto C Bertolo

    2011-02-01

    Full Text Available Este trabalho apresenta o projeto de aterramento elétrico para Sistema Monofilar com Retorno pela Terra (MRT, em solicitações de baixas frequências, utilizando-se o método das imagens e considerando a simplificação do método dos potenciais constantes. Simulou-se o comportamento de três diferentes configurações de aterramento: hastes em triângulo, em quadrado vazio e para nove hastes, formando uma malha com quatro quadrados. A partir da simulação obtiveram-se o valor da resistência de aterramento para cada configuração e os potenciais gerados na superfície do solo. Com base nesses resultados foi possível comparar os valores tabelados para resistências mínimas, em função da potência do transformador, aplicados para diferentes concessionárias de energia que utilizam o Sistema MRT, com os valores calculados que mantêm os potenciais no solo em níveis seguros para seres humanos e animais. Os resultados mostraram que é possível utilizar aterramentos mais simples e mais baratos, pois os gradientes de tensões no solo se mantiveram em níveis seguros.This work presents a grounding project for a Single Wire Earth Return (SWER system in low frequency applications, through the use of the image method, a simplification of the constant potential method. The responses of three different grounding configurations were simulated: electrodes in triangular format, electrodes placed in the corners of a square and nine electrodes placed in the corners of a grid with four squares. With the mentioned simulation it was possible to calculate the ground resistance and the surface voltage of each configuration. Based on these results, it was possible to compare the values for minimal resistance, depending on the power of the transformer, applied to various power utilities that use the SWER system with the values that hold the potential in the soil at safe levels for human beings and animals. Results showed that it is possible to use simpler and

  17. A problemática ambiental decorrente dos resíduos sólidos gerados no processo produtivo do queijo

    Directory of Open Access Journals (Sweden)

    M. A. Silva

    2015-12-01

    Full Text Available O processo de fabricação e comercialização de queijo, sejam eles em grandes agroindústrias ou de modo artesanal em pequenas propriedades rurais, é parte importante na economia brasileira, sobretudo para algumas regiões, a exemplo da região nordeste do Brasil. O objetivo deste trabalho foi efetuar uma caracterização preliminar da produção de queijo, enfatizando o levantamento de suas relações com o meio ambiente e os possíveis aspectos e impactos ambientais decorrentes da produção de queijo. Para tanto, utilizou-se como processo metodológico uma revisão bibliográfica da problemática em estudo a fim de se obter a maior quantidade possível de informações, além de fazer uma correlação com estudos que traz alternativas para o aproveitamento do principal efluente gerado no processo produtivo do queijo, que é o soro derivado do  leite. O soro do leite é um subproduto de alto potencial poluidor, e as empresas perceberam que agregando valor a esse subproduto derivado do leite tem-se uma alternativa viável economicamente, além da redução dos custos com o tratamento de efluentes. Destacando assim, a necessidade de conscientização dos empresários deste segmento, bem como da instalação e/ou adequação de sistemas de tratamento eficientes dos resíduos e efluentes gerados em todas as etapas do processo, haja vista o alto potencial poluidor e impactante desta atividade.The environmental problems resulting from solid waste generated in the production process cheeseAbstract: The process of manufacturing and marketing of cheese, whether in big agribusiness or artisanal way in small farms, is an important part in the Brazilian economy, especially for some regions such as the northeast region of Brazil. The objective of this study was to perform a preliminary characterization of cheese production, emphasizing raising its relations with the environment and potential environmental aspects and impacts of the cheese production

  18. TERRAS RARAS: CONSIDERAÇÕES SOBRE O PLANALTO DE POÇOS DE CALDAS, MG NO NOVO CENÁRIO MUNDIAL/RARE EARTH ELEMENTS: CONSIDERATIONS ON THE POÇOS DE CALDAS PLATEAU IN THE NEW WORLD SCENE

    National Research Council Canada - National Science Library

    A D V Gouvea; F C Navarro; C D Roveri

    2014-01-01

    .... This is a lateritic deposit developed on an alkaline complex that intrudes in a crystalline basement domain with different responses to laterization and/or oxidation processes resulting in the...

  19. Synthesis and characterization of rare earth molybdates nanoparticles for detection of specific prostatic cancer (PSA); Preparacao e caracterizacao de nanoparticulas de molibdatos de terras raras para deteccao do antigeno especifico da prostata (PSA)

    Energy Technology Data Exchange (ETDEWEB)

    Dias, Clarissa Lombardi

    2013-07-01

    The interest in using rare earths to investigate the properties and functions of biochemical systems as well as to determinate biological substances has increased in several fields, including biomarkers in immunology (fluoro immunoassays). Nowadays the use of lanthanides in the diagnosis of various diseases have become more important through the development of commercial diagnostic kits. As main feature, these rare earths can show a long lifetime, photo stability and emission bands of atomic like behavior and well defined, in the visible region, demonstrating unique advantages when compared to other luminescent species. The present work had as its goal to synthesize rare earth molybdates by the co-precipitation method as well as to characterize these materials by X-ray diffraction, near infrared spectroscopy, thermogravimetric analysis, scanning electronic microscopy, transmission electronic microscopy and luminescent studies. In this work, three different studied were developed: the influence of the vortex speed variation during co-precipitation in the structure of the final product, morphology and luminescence properties; the influence of the annealing temperature also in the structure, morphology and luminescence properties; and the influence of concentration of the doping in the luminescence properties. Another important step of this work was the functionalization of nanoparticles using an organosilane (APTES) to coat and establish points for binding the particles to biological species. It was proved that this process was very efficient by the characterization results and the silica incorporation was well succeeded. Specific prostatic cancer (PSA) was then linked to the functionalized nanoparticles to diagnostic prostatic cancer by fluoroimmunoassay and levels for detection were established. (author)

  20. Método hidrometalúrgico para reciclagem de metais terras raras, cobalto, níquel, ferro e manganês de eletrodos negativos de baterias exauridas de Ni-MH de telefone celular

    Directory of Open Access Journals (Sweden)

    Vinicius Emmanuel de Oliveira dos Santos

    2014-01-01

    Full Text Available A hydrometallurgical method for the recovery of rare earth metals, cobalt, nickel, iron, and manganese from the negative electrodes of spent Ni - MH mobile phone batteries was developed. The rare earth compounds were obtained by chemical precipitation at pH 1.5, with sodium cerium sulfate (NaCe(SO42.H2O and lanthanum sulfate (La2(SO43.H2O as the major recovered components. Iron was recovered as Fe(OH3 and FeO. Manganese was obtained as Mn3O4.The recovered Ni(OH2 and Co(OH2 were subsequently used to synthesize LiCoO2, LiNiO2 and CoO, for use as cathodes in ion-Li batteries. The anodes and recycled materials were characterized by analytical techniques.

  1. Analysis of electrical and microstructural characteristics of a ZnO-based varistor doped with rare earth oxide; Analise das caracteristicas microestruturais e eletricas de um varistor a base de ZnO dopado com oxidos de terras raras

    Energy Technology Data Exchange (ETDEWEB)

    Andrade, J.M. de; Dias, R.; Furtado, J.G. de M. [Centro de Pesquisas de Energia Eletrica (CEPEL), Rio de Janeiro, RJ (Brazil); Assuncao, F.C.R. [Pontificia Univ. Catolica do Rio de Janeiro (PUC/Rio), RJ (Brazil)

    2010-07-01

    Varistor is a semiconductor device, used in the protection of electrical systems, characterized to have a high no-linear electric resistance. Its properties are directly dependents of its chemical composition and microstructural characteristics. In this work were analyzed microstructural and electrical characteristics of a ZnO-based varistor doped with rare earth oxide, with chemical composition (mol%) 98,5.ZnO - 0,3.Pr{sub 6}O{sub 11} - 0,2.Dy{sub 2}O{sub 3} - 0,9.Co{sub 2}O{sub 3} - 0,1.Cr{sub 2}O{sub 3}. X-ray diffraction for phase characterization, scanning electron microscopy and energy dispersive X-ray spectroscopy were used for microstructural analysis. Measurement of average grain size and electrical and dielectric characteristics complete the characterization. The results show the formation of biphasic microstructure and with high densification, presenting relevant varistors characteristics but that would need improvements.(author)

  2. Optical spectroscopy of the Er{sup +3} and Gd{sup +3} rare earth ions in fluoridate glasses; Espectroscopia optica dos ions terras raras Er{sup +3} e Gd{sup +3} em vidros fluoroindatos

    Energy Technology Data Exchange (ETDEWEB)

    Ribeiro, Cristina Tereza Monteiro

    1996-12-31

    This work consists of the optical characterization of rare earth Er{sup +3}, Yb{sup +3} and Gd{sup +3} fluoridate glasses by means of luminescence, optical absorption and lifetime techniques. Up conversion process were studied in Er{sup +3}, Yb{sup +3} doped glasses (with the same Er F{sub 3} concentration and different Yb F{sub 3} concentration) excited at 0.8 and 0.98 {mu}m. Transitions {sup 2} H{sub 11/2},{sup 4} S 3{sub /2}->{sup 4} I{sub 15/2}, (green) and {sup 4} F{sub 9/2}->{sup 4} I{sub 15/2} (red) were detected. As a result, we conclude that the Yb{sup -3} incorporation increases the emission efficiency of the red up conversion process. Spectroscopic measurements performed on Gd{sup +3} fluoridate glasses did not point out crystallization tendency of the glasses, even for high Gd{sup +3} concentrations. The Judd-Ofelt parameters of Gd{sup +3} fluoridate glasses were obtained, so that the optical properties of Gd{sup +3} were determined. The results are in good agreement with the experiment. (author) 32 refs., 10 tabs., 43 figs.

  3. Mechanism of luminescent emission in BaY{sub 2}F{sub 8} scintillators doped with rare earths; Mecanismos de emissao luminescente nos cintiladores de BaY{sub 2}F{sub 8} dopado com terras raras

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Ana Carolina de Mello

    2013-07-01

    In this work samples of Barium Yttrium Fluoride (BaY{sub 2}F{sub 8}-BaYF) doped with different concentrations of Tb{sup 3+}, Er{sup 3+}, Tm{sup 3+} e Nd{sup 3+} ions were characterized, aiming their application in radiation detection devices using their scintillating properties. Two types of samples were produced, polycrystalline samples, obtained via solid state reaction and single crystals, obtained via the floating zone melting method. The radioluminescence measurements (RL) revealed that the samples doped with 2.0 or 3.0 % Tb showed RL intensity at 545 nm two times higher than samples of CsI:Tl, although the total scintillation yield was smaller when compared to this commercial scintillator. Thermoluminescence (TL) results showed that all doped samples exhibited the same peak at 123°C, which is characteristic of the matrix (BaY{sub 2}F{sub 2}). Comparison of the areas under the TL and RL curves for Tb{sup 3+} and Nd{sup 3+} doped BaYF revealed that the trapping centers are competing with the scintillation of the samples. However, this was not true for the Er{sup 3+} and Tm{sup 3+} doped samples and it was found that the scintillation yield is independent of the trap concentration up to a certain concentration limit. From this point on, the scintillation yields started increasing as the trap concentration increased. The radiation damage defects in BaYF:Tb{sup 3+} were studied via optical absorption (OA) and correlated with TL, showing that trapping centers are connected to the color centers. All samples exhibited different luminescence decay processes with time constants ranging from microseconds, for the fast processes, milliseconds, for the intermediate ones, and phosphorescent processes with decay time on the order of seconds. For the Nd{sup 3+} doped samples, very fast decay process was also found with time constants of about 60ns and that is an indication that this material can be used in fast detection systems, although its scintillation efficiency was weak. The combined results obtained with these techniques together with an analysis of X-ray absorption spectroscopy (XAS) and X-rays Excited Optical Luminescence (XEOL) allowed the development of a model for the scintillation mechanism for the rare earth doped BaYF systems. (author)

  4. Rare earth elements and uranium in groundwater under influence of distinct aquifers in Campinas, SP, Brazil; Elementos terras raras e uranio em aguas subterraneas sob influencia de aquiferos distintos em Campinas (SP)

    Energy Technology Data Exchange (ETDEWEB)

    Bulia, Isabella Longhi; Enzweiler, Jacinta, E-mail: isabellalonghi@ige.unicamp.br, E-mail: jacinta@ige.unicamp.br [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Instituto de Geociencias

    2015-07-01

    The composition of groundwaters results mainly from water-rock reactions within aquifers. Among the various constituents of water, the rare earth elements (REE) and uranium can serve as tracers of geochemical processes and hydrological flow paths. The main objective of this study was to associate the chemical composition of groundwaters extracted from three distinct aquifer systems (crystalline, diabase and sedimentary) with that of the respective hosts rocks. The area of the study is located at the campus of University of Campinas (Campinas, SP). Samples of groundwater collected from four tubular wells were used to determine physicochemical parameters, major ions and trace elements, including the REE. The results confirm that the water of two wells (IMECC and IB) is predominantly influenced by the crystalline and diabase aquifers, while the other two (GM and FEF) by the sedimentary aquifer. Both the individual and normalized REE values of the four wells are distinct from each other, pointing to the heterogeneity of the local geology. The uranium concentration in the water of one well (GM) exceeded the guideline value for this element in drinking water. The U probably results from the oxidative dissolution of U-bearing phases in the sedimentary aquifer. However, the hydrochemical modeling indicated Ca{sub 2}UO{sub 2}(CO{sub 3}){sub 3} and CaUO{sub 2}(CO{sub 3}){sub 2}{sup 2-} as the major U dissolved species, which are considered non-toxic and non-bioavailable according to literature data. (author)

  5. Hematoma subdural intracraniano: uma rara complicação após raquianestesia: relato de caso

    Directory of Open Access Journals (Sweden)

    Flora Margarida Barra Bisinotto

    2012-02-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O hematoma subdural intracraniano é uma complicação rara após raquianestesia. O diagnóstico é muitas vezes difícil porque os sintomas iniciais são os mesmos da cefaleia pós-punção da dura-máter. O objetivo é relatar o caso de um hematoma subdural diag nosticado precocemente, após uma raquianestesia realizada com agulha de calibre fino e punção única. RELATO DO CASO: Paciente de 48 anos, ASA I, submetida a raquianestesia para cirurgia de correção de incontinência urinária. Foi realizada a raquianestesia com agulha 27G Quincke e punção única. A cirurgia foi sem intercorrências, e a paciente recebeu alta hospitalar. Após 48 horas da punção raquidiana, a paciente relatou cefaleia de início súbito, de forte intensidade, acometendo principalmente a região orbitária, mas também a região temporal, com melhora importante no decúbito dorsal e acompanhada de dois episódios de vômitos. Foi solicitada tomografia de crânio que revelou a presença de um hematoma subdural agudo frontotemporoparietal esquerdo. Foi indicado tratamento conservador com analgésicos, dexametasoma e hidantoína. Após 17 dias, apresentou quadro de cefaleia intensa, acompanhada de dormência e paresia do membro superior direito, e distúrbio da fala e comportamento. O hematoma foi drenado cirurgicamente. A paciente evoluiu bem sem sequelas. CONCLUSÕES: A cefaleia é a complicação mais frequente após raquianestesia e é considerada de evolução benigna. Faz com que diagnósticos potencialmente fatais, como o hematoma subdural, não sejam feitos em muitos casos, ou sejam tardios. Este caso descreve uma ocorrência rara, um hematoma subdural agudo após uma raquianestesia com agulha fina em uma paciente sem fatores de risco para sangramento

  6. Terra Rossa in the Mediterranean Region: Parent Materials, Composition and Origin

    OpenAIRE

    Durn, G.

    2003-01-01

    In the past, the term “terra rossa” became quite a common indication for all limestone derived red soils in the Mediterranean region. Today, in some classification systems based on the Mediterranean climate as the major soil differentiating criterion, the term terra rossa is used as a name for the soil subclass “Modal Fersiallitic Red soil” when situated on limestones (Duchaufour, 1982). However, several national soil classifications (e.g. Croatian, Italian, Israeli) retained the term “terra ...

  7. La comunicación en la red de pacientes con enfermedades raras en España 

    Directory of Open Access Journals (Sweden)

    A Castillo Esparcia

    2015-11-01

    Full Text Available Introducción: Este estudio se centra en la estrategia de comunicación de las organizaciones de pacientes con enfermedades raras en internet. Objetivo: Analizar la utilización de las herramientas de comunicación en internet. Métodos: Se examinaron 143 organizaciones de pacientes nacionales. Se ha realizado un análisis de contenido de cada una de las webs de las organizaciones, redes sociales y blogs. Y se han llevado a cabo encuestas telefónicas a 90 organizaciones con las que se contactó, el 63% del total. Resultados: El 84% de las web está gestionada por miembros de las organizaciones sin formación específica y el 16% por profesionales. Se dirigen en la misma proporción a pacientes y allegados que al resto de la población, pero no utilizan herramientas que les permitan una comunicación más fluida. Discusión y Conclusiones: Los resultados muestran la necesidad de contar con personal especializado y con espacios habilitados en la red para comunicarse con el resto de la población.

  8. Dalila e la sua voglia di godersi l’intervallo: vita e pensieri di una giovane con malattia rara

    Directory of Open Access Journals (Sweden)

    Orazio Vecchio

    2015-07-01

    Full Text Available Dalila è una bella ragazza originaria della provincia di Catania, da tempo trasferitasi nel capoluogo etneo. Laureata, ha un lavoro, un marito e spera di avere presto anche un bambino. Scherza e sorride con generosità, ma sa essere seria e diligente quando si richiede. A vederla, impeccabile in ufficio o rilassata il sabato sera, nessuno sospetterebbe che possa avere una malattia rara e degenerativa. Eppure, tra le preoccupazioni di ogni giorno e le speranze per il futuro, Dalila affronta un’importante patologia autoimmune. Per tanto tempo ha taciuto, quasi nascosto o rimosso, la sua sofferenza; oggi ne parla con le persone più vicine e ha accettato di aprirsi in questo dialogo, in cui racconta l’impatto con la diagnosi e le prime cure, il rapporto con i genitori e quello con il marito, le relazioni con gli amici e i problemi sul lavoro, le lunghe ore in ospedale e i pensieri sulla morte, la voglia di vivere al meglio e la fede in Dio. Dimensioni e aspetti riscoperti o valorizzati grazie alla malattia.

  9. The non-coding RNA TERRA is a natural ligand and direct inhibitor of human telomerase.

    Science.gov (United States)

    Redon, Sophie; Reichenbach, Patrick; Lingner, Joachim

    2010-09-01

    Telomeres, the physical ends of eukaryotes chromosomes are transcribed into telomeric repeat containing RNA (TERRA), a large non-coding RNA of unknown function, which forms an integral part of telomeric heterochromatin. TERRA molecules resemble in sequence the telomeric DNA substrate as they contain 5'-UUAGGG-3' repeats near their 3'-end which are complementary to the template sequence of telomerase RNA. Here we demonstrate that endogenous TERRA is bound to human telomerase in cell extracts. Using in vitro reconstituted telomerase and synthetic TERRA molecules we demonstrate that the 5'-UUAGGG-3' repeats of TERRA base pair with the RNA template of the telomerase RNA moiety (TR). In addition TERRA contacts the telomerase reverse transcriptase (TERT) protein subunit independently of hTR. In vitro studies further demonstrate that TERRA is not used as a telomerase substrate. Instead, TERRA acts as a potent competitive inhibitor for telomeric DNA in addition to exerting an uncompetitive mode of inhibition. Our data identify TERRA as a telomerase ligand and natural direct inhibitor of human telomerase. Telomerase regulation by the telomere substrate may be mediated via its transcription.

  10. PREVALENCIA Y MORTALIDAD DE LA ENFERMEDAD DE HUNTINGTON A PARTIR DEL REGISTRO POBLACIONAL DE ENFERMEDADES RARAS DE LAS ISLAS BALEARES DURANTE EL PERÍODO 2010-2013

    Directory of Open Access Journals (Sweden)

    Mercedes Cáffaro Rovira

    2017-01-01

    Full Text Available La enfermedad de Huntington (EH es una enfermedad hereditaria de baja prevalencia, por lo que se incluye en los registros de enfermedades raras. El registro poblacional de enfermedades raras de las Islas Baleares se inició en el año 2010. Previamente no existían datos de prevalencia y mortalidad de la EH en las Islas Baleares. El objetivo de este estudio fue determinar la prevalencia y la mortalidad de la enfermedad de Huntington en las Islas Baleares durante el periodo 2010-2013. Métodos: Se utilizaron como fuentes de información el registro poblacional de enfermedades raras de las Islas Baleares, del que se obtuvieron los casos diagnosticados, el Registro de mortalidad de las Islas Baleares, del que se obtuvieron los casos fallecidos, el registro del Servicio de Salud de las Islas Baleares del que se obtuvieron el número de tarjetas sanitarias y del Instituto Nacional de Estadística se obtuvieron los datos de población. Se calcularon las tasas de prevalencia y de mortalidad. Resultados: El registro poblacional de enfermedades raras de las Islas Baleares durante el periodo 2010-2013 registró 27 casos de EH. El 63% fueron mujeres. La tasa de prevalencia fue de 2,6 por 105 y la tasa de mortalidad de 1,1 por 105. La isla de Menorca fue la más afectada con una prevalencia de 5,9 por 105 y una mortalidad de 2,1 por 105. Conclusiones: La prevalencia y mortalidad de la EH en las Islas Baleares son bajas en comparación con zonas del entorno.

  11. The lncRNA HOTAIRM1 regulates the degradation of PML-RARA oncoprotein and myeloid cell differentiation by enhancing the autophagy pathway

    Science.gov (United States)

    Chen, Zhen-Hua; Wang, Wen-Tao; Huang, Wei; Fang, Ke; Sun, Yu-Meng; Liu, Shu-Rong; Luo, Xue-Qun; Chen, Yue-Qin

    2017-01-01

    Increasing evidence has indicated that long noncoding RNAs (lncRNAs) are of great importance in different cell contexts. However, only a very small number of lncRNAs have been experimentally validated and functionally annotated during human hematopoiesis. Here, we report an lncRNA, HOTAIRM1, which is associated with myeloid differentiation and has pivotal roles in the degradation of oncoprotein PML-RARA and in myeloid cell differentiation by regulating autophagy pathways. We first revealed that HOTAIRM1 has different variants that are expressed at different levels in cells and that the expression pattern of HOTAIRM1 is closely related to that of the PML-RARA oncoprotein in acute promyelocytic leukemia (APL) patients. We further revealed that the downregulation of HOTAIRM1 could inhibit all-trans retinoic acid (ATRA) -induced degradation of PML-RARA in APL cells and repress the process of differentiation from promyelocytic to granulocytic cells. More importantly, we found that HOTAIRM1 regulates autophagy and that autophagosome formation was inhibited when HOTAIRM1 expression was reduced in the cells. Finally, through the use of a dual luciferase activity assay, AGO2 RNA immunoprecipitation and RNA pull-down, HOTAIRM1 was revealed to act as a microRNA sponge in a pathway that included miR-20a/106b, miR-125b and their targets ULK1, E2F1 and DRAM2. We constructed a human APL-ascites SCID mouse model to validate the function of HOTAIRM1 and its regulatory pathway in vivo. This is the first report showing that a lncRNAs regulates autophagy and the degradation of the PML-RARA oncoprotein during the process of myeloid cell differentiation blockade, suggesting that lncRNAs may be the potential therapeutic targets for leukemia. PMID:27740626

  12. O Goodwill gerado pelo Passivo

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    Eliseu Martins

    2017-01-01

    Full Text Available Objetivo: O objetivo deste estudo está relacionado à figura do Goodwill originado do Passivo de uma empresa, ou seja, não é a do Goodwill normalmente constituído pelos Ativos Intangíveis capazes de produzir uma rentabilidade anormal e que fazem com que o valor da entidade como um todo, em funcionamento, seja maior do que a soma algébrica dos valores justos de seus elementos patrimoniais. Trata-se de uma visão que se pode entender como novidade para muitos, ou seja, a do Goodwill originado do Passivo e, não, dos Ativos de uma empresa. Existem empresas que sequer conseguem remunerar o risco que seus Ativos carregam, mas podem apresentar Goodwill devido à forma com que suas atividades são financiadas. Método: Como ensaio, são apresentados conceitos básicos e de formulação, normalmente utilizados em avaliações de empresas. Na sequência, são apresentadas simulações que demonstram, de forma objetiva, o verdadeiro sentido técnico da formulação. Resultados: Sabendo-se que determinadas agências estatais de desenvolvimento e o próprio BNDES acabam financiando determinadas atividades com taxas de juros generosas, este estudo apresenta ainda um caso real de existência de Goodwill originado do Passivo de uma empresa brasileira. Contribuições: Este trabalho tem como uma de suas principais contribuições a exposição de um tema que é praticamente desconhecido no mundo acadêmico, totalmente desconsiderado pelas normas e legislações contábeis, mas presente no mundo dos analistas e investidores mais bem preparados, e o faz pela não disseminação desse conceito, com apresentação e redação acessíveis a todos os níveis de leitores.

  13. 15 Years of Terra, 14 Years of Application Usage

    Science.gov (United States)

    Schmaltz, J. E.; Alarcon, C.; Boller, R. A.; Cechini, M. F.; Davies, D.; Fu, G.; Gunnoe, T.; Hall, J. R.; Huang, T.; Ilavajhala, S.; Jackson, M.; King, J.; McGann, M.; Murphy, K. J.; Roberts, J. T.; Thompson, C. K.; Ye, G.

    2014-12-01

    The instruments onboard the Terra spacecraft were designed for long-term Earth science research but not long after launch it became apparent that this data and imagery could be made available in near real-time for applications users. During the year 2000 fire season in the western United States, the US Forest Service approached NASA with a request to expedite MODIS fire detections. The Rapid Response system was created to generate fire detections as well as true color imagery in both swath and geo-referenced formats. This imagery was used by a wide variety of applications, such as NASA's AERONET program, the USDA Foreign Agricultural Service, Antarctic resupply shipping, flood mapping for relief agencies, Deepwater Horizon monitoring, volcanic ash monitoring, as well as print, televised, and Internet media. From 2004, the University of Maryland's Web Fire Mapper helped distribute fire detection information in a variety of formats. However, the applications community expressed the need for near-real time access to the underlying data. This requirement led to the development of the Land Atmosphere Near real-time Capability for EOS (Earth Observing System) (LANCE) in 2009. To achieve the latency requirements, many components of the EOS satellite operations, ground and science processing systems had to be made more efficient. In addition, products that require ancillary data were modified to use alternate inputs. Forty Terra MODIS data products are currently available from LANCE. LANCE also includes data from other instruments including AIRS, AMSR-E, MLS, and OMI. To help near-real time users navigate this large data offering, a new imagery service was begun in 2011 - Global Imagery Browse Services (GIBS). This service provides very responsive viewing using the Web Map Tile Service protocol. These programs will continue to support and expand the use of Terra data for near-real time applications well into the future.

  14. Classification of maritime objects in TerraSAR-X imagery

    OpenAIRE

    Velotto, Domenico; Tings, Björn; Bentes da Silva, Carlos Augusto

    2016-01-01

    For an adequate security of the maritime domain is necessary to be aware of the objects location and their activities, e.g. ship traffic, in relevant areas of the sea. TerraSAR-X, a satellite radar imager operating at X-band, is a powerful tool to detect maritime objects, e.g. ships, oil platforms, icebergs etc., which can raise potential risk for maritime traffic and environment. The use of satellite radar to create such awareness has the benefits, among many, that can detect also no self-re...

  15. TerraSAR-X Capabilities in Polar Regions

    OpenAIRE

    Floricioiu, Dana; Gottwald, Manfred; Diedrich, Erhard; Roth, Achim; Eineder, Michael

    2008-01-01

    DLR participates in a coordinated plan established by the space agencies for the optimum use of SAR acquisitions over the Artic and Antarctica for the remaining period of IPY and beyond. Due to the specific advantages of the X-band in respect to snow and ice properties and the high spatial resolution of the data, the contribution of TerraSAR-X focuses on topics like mapping of seasonal snow cover at high latitudes, ice sheet velocity, velocity fields of slow and fast moving glaciers, permafro...

  16. Estudo químico de logo gerado num sistema anaeróbico de tratamento de efluentes de origem residencial

    Directory of Open Access Journals (Sweden)

    Vagner Guedes

    2015-07-01

    Full Text Available processos biológicos aeróbios e ou anaeróbios que apresentam dispositivos de ordem variável e geram resíduos definidos como sólidos segundo a ABNT 10004/2004. Um dos dispositivos que podem estar presentes numa ETE que utiliza processo anaeróbio é o reator de manta de lodo. O objetivo deste trabalho foi de avaliar quimicamente a composição do lodo gerado num destes reatores através da fluorescência de raios X, pH, carbono orgânico (CO, matéria orgânica (MO, nitrogênio total Kjeldahl (NTK, relação C/N, capacidade de troca catiônica efetiva (CTC, relação CTC/CO, potássio (K, fósforo orgânico (PO, fósforo mineral (PM e determinar a concentração de Cr, Cu, Ni, Ag, Fe, Mn, Zn, Pb, Cd e Ba nos extratos obtidos através do método de Tessier. Através da fluorescência de raios X, observou-se que a somatória das porcentagens dos elementos Al, Si, Fe, S, Ca, P, Ti, K e Zn está próxima de 99 %. Que os valores médios da MO, NTK e CTC são respectivamente 20,2%, 0,64 % e 19,6 cmolc kg-1, e que a disposição desse material no meio ambiente pode ser associada a algum risco devido às concentrações de ferro, manganês, zinco e cádmio, em presença de um redutor, ferro em presença de um oxidante e manganes em presença de pH=5 estarem acima do VMP da Resolução CONAMA 430 /11.

  17. Chromosomal abnormality of acute promyelocytic leukemia other than PML-RARA: a case report of acute promyelocytic leukemia with del(5q).

    Science.gov (United States)

    Imataki, Osamu; Uemura, Makiko

    2016-01-01

    The recent study described a better outcome in acute promyelocytic leukemia patients treated with all-trans retinoic acid and arsenic oxide compared to those treated with all-trans retinoic acid combined with conventional chemotherapy. The pivotal study indicated that favorable-risk acute promyelocytic leukemia patients can be cured without any cytotoxic chemotherapy. Even high-risk patients are treatable with cytotoxic agents. Acute promyelocytic leukemia does not develop only by the dedifferentiation caused by PML-RARA. A determined oncogene other than PML-RARA which promotes cell proliferation would be required. We recently treated a 30-year-old Japanese female who achieved molecular remission with only the administration of all-trans retinoic acid. The patient's leukemic clones concomitantly had a del(5q) aberrant chromosome with t(15;17) (q22;q12). The patient's bone marrow cells indicated clonal evolution of the tumor cells expressing CD13dim, CD33+, CD117+, and lacking HLA-DR, CD34 and CD11b. A fluorescence in situ hybridization analysis detected PML-RARA fusion genes in the patient's bone marrow specimens, leading to the diagnosis of acute promyelocytic leukemia. A del(5q) is one of the characteristic chromosomal abnormalities observed in myelodysplastic syndrome. On the other hand, up to 40 % of acute promyelocytic leukemia cases are known to harbor the addition of a clonal cytogenetic abnormality. However, such a case acute promyelocytic leukemia with del(5q) would be rare, rather than myelodysplastic syndrome, consequently obtaining t(15;17). Which cytogenetic abnormalities, acute promyelocytic leukemia or myelodysplastic syndrome, came first is informative to make a clinical decision for the initial therapy. In this case, we speculated the PML-RARA translocation is an original pathogenesis and thereafter additional cytogenetic abnormalities (del(5q) and -6) common in myelodysplastic syndrome. All-trans retinoic acid lead the patient into molecular

  18. Síndrome de Liddle: diagnóstico tardio de causa rara de hipertensão arterial

    Directory of Open Access Journals (Sweden)

    Silva Ana Cristina Simões e

    2002-01-01

    Full Text Available Objetivo: a finalidade desse relato de caso é chamar a atenção para uma doença que, embora rara, é causa de hipertensão arterial grave em crianças. O relato procura chamar a atenção dos pediatras para a importância do diagnóstico precoce de hipertensão arterial, e do valor de se estabelecer uma investigação apropriada a cada caso. Relato: neste artigo é relatado uma caso de um paciente de treze anos, do sexo masculino, com quadro clínico e laboratorial típico dessa doença. O diagnóstico foi estabelecido a partir do quadro clínico associado à presença de hipocalemia crônica, aumento da excreção urinária de potássio acoplado à retenção de sódio, e diminuição da atividade de renina plasmática e dos níveis circulantes de Angiotensina II e aldosterona. Apesar da resposta inicial ao uso de triamtereno, o paciente evoluiu com perda da função renal, secundária ao retardo no diagnóstico e ao mau controle da hipertensão. Discussão: a Síndrome de Liddle consiste numa forma de pseudo-aldosteronismo caracterizado por hipertensão arterial, hipocalemia, alcalose metabólica e retardo no crescimento. Alguns aspectos da fisiopatologia, do diagnóstico e do tratamento são discutidos no estudo.

  19. Telomeric repeat-containing RNA (TERRA) related to polycystic ovary syndrome (PCOS).

    Science.gov (United States)

    Wang, Caiqin; Shen, Fengxian; Zhu, Yuning; Fang, Yuying; Lu, Shiming

    2017-04-01

    Telomeric repeat-containing RNA (TERRA) participates in the regulation of telomere length, and leucocyte telomere length (LTL) plays an important role in the pathophysiology of polycystic ovary syndrome (PCOS), but little is known about the role of TERRA in PCOS. To evaluate the role of TERRA and peripheral blood LTL in PCOS. Forty women with PCOS and 35 healthy women without PCOS were recruited. A prospective case-control study was performed. RNA fluorescence in situ hybridization (FISH) was used to detect TERRA expression in peripheral blood leucocyte. Quantitative PCR was used to measure TERRA expression and the mean LTL in the PCOS and control groups. We analysed the association between related clinical parameters and the age-adjusted ratio of the telomere repeat length (T/S ratio) or TERRA. Telomeric repeat-containing RNA was expressed in human peripheral blood leucocytes, and the signal was abolished after culture with RNase A. The age-adjusted LTLs were significantly longer in the PCOS group than in the control group (P PCOS group than in the control group (P PCOS group (r = 0·532, P = 0·002; r = -0·477, P = 0·017). We found TERRA expression in human peripheral blood leucocytes, and LTLs were positively associated with PCOS. TERRA and testosterone play an important role in the LTL regulation in PCOS. © 2016 John Wiley & Sons Ltd.

  20. Terra firma-forme dermatosis: a retrospective review of 31 patients.

    Science.gov (United States)

    Berk, David R

    2012-01-01

    Terra firma-forme dermatosis is an idiopathic condition characterized by acquired, dirtlike plaques despite normal hygiene. A diagnosis can be reached by removing lesions with gentle alcohol swabbing. Although Terra firma-forme dermatosis was first described more than 20 years ago and is thought to be not uncommon in clinical practice, it has never been systematically studied. There are few publications about this condition, including no case series of more than six patients. In particular, little is known about the incidence, peak age groups, and most common locations of Terra firma-forme dermatosis. A retrospective review was conducted to identify cases of Terra firma-forme dermatosis in a single-provider practice consisting of 55% pediatric and 45% adult patients. Thirty-one patients with Terra firma-forme dermatosis were identified, including 10 who presented with Terra firma-forme dermatosis as their primary concern. Only two patients were older than 17 years. The median duration of lesions was 4 months. The most common lesion locations were the neck, ankles, and face. Before presenting to the dermatology clinic, three patients had undergone endocrine evaluations, and four had been prescribed topical corticosteroids. Terra firma-forme dermatosis is relatively common and most often occurs in children on the neck or posterior malleolus. This series exemplifies the importance of recognizing Terra firma-forme dermatosis so as to provide rapid relief for patients and avoid unnecessary tests and treatments. © 2011 Wiley Periodicals, Inc.

  1. Terra-Kleen Response Group, Inc. Solvent Extraction Technology Rapid Commercialization Initiative Report

    Science.gov (United States)

    Terra-Kleen Response Group Inc. (Terra-Kleen), has commercialized a solvent extraction technology that uses a proprietary extraction solvent to transfer organic constituents from soil to a liquid phase in a batch process at ambient temperatures. The proprietary solvent has a rel...

  2. EPA SITE DEMONSTRATION OF THE TERRA VAC IN SITU VACUUM EXTRACTION PROCESS IN GROVELAND, MASSACHUSETTS

    Science.gov (United States)

    This paper presents an EPA evaluation of the patented Terra Vac, Inc.'s in situ vacuum extraction process that was field-demonstrated on a trichloroethylene (TCE) contaminated soil in Groveland, MA, under the EPA Superfund Innovative Technology Evaluation (SITE) program. he Terra...

  3. Mechanochemical properties of individual human telomeric RNA (TERRA) G-quadruplexes.

    Science.gov (United States)

    Yangyuoru, Philip M; Zhang, Amy Y Q; Shi, Zhe; Koirala, Deepak; Balasubramanian, Shankar; Mao, Hanbin

    2013-10-11

    Potential functions: By following the unfolding and refolding of individual human RNA telomeric (TERRA) G-quadruplexes (GQs) in laser tweezers, the mechanical stability and transition kinetics of RNA GQs are obtained. Comparison between TERRA and DNA GQs suggests their different regulatory capacities for processes associated with human telomeres. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  4. Identification of TERRA locus unveils a telomere protection role through association to nearly all chromosomes.

    Science.gov (United States)

    López de Silanes, Isabel; Graña, Osvaldo; De Bonis, Maria Luigia; Dominguez, Orlando; Pisano, David G; Blasco, Maria A

    2014-09-03

    Telomeric RNAs (TERRAs) are UUAGGG repeat-containing RNAs that are transcribed from the subtelomere towards the telomere. The precise genomic origin of TERRA has remained elusive. Using a whole-genome RNA-sequencing approach, we identify novel mouse transcripts arising mainly from the subtelomere of chromosome 18, and to a lesser extend chromosome 9, that resemble TERRA in several key aspects. Those transcripts contain UUAGGG-repeats and are heterogeneous in size, fluctuate in abundance in a TERRA-like manner during the cell cycle, are bound by TERRA RNA-binding proteins and are regulated in a manner similar to TERRA in response to stress and the induction of pluripotency. These transcripts are also found to associate with nearly all chromosome ends and downregulation of the transcripts that originate from chromosome 18 causes a reduction in TERRA abundance. Interestingly, downregulation of either chromosome 18 transcripts or TERRA results in increased number of telomere dysfunction-induced foci, suggesting a protective role at telomeres.

  5. TERRA transcripts are bound by a complex array of RNA-binding proteins.

    Science.gov (United States)

    López de Silanes, Isabel; Stagno d'Alcontres, Martina; Blasco, Maria A

    2010-06-29

    Telomeres are transcribed from the telomeric C-rich strand, giving rise to UUAGGG repeat-containing telomeric transcripts or TERRA, which are novel structural components of telomeres. TERRA abundance is highly dependent on developmental status (including nuclear reprogramming), telomere length, cellular stresses, tumour stage and chromatin structure. However, the molecular mechanisms and factors controlling TERRA levels are still largely unknown. In this study, we identify a set of RNA-binding proteins, which endogenously bind and regulate TERRA in the context of primary mouse embryonic fibroblasts. The identification was carried out by biotin pull-down assays followed by LC-MALDI TOF/TOF mass spectrometry. Different members of the heterogeneous nuclear ribonucleoprotein family are among the ribonucleoprotein family that bind more abundantly to TERRA. Downregulation of TERRA-bound RBPs by small interfering RNA further shows that they can impact on TERRA abundance, their location and telomere lengthening. These findings anticipate an impact of TERRA-associated RBPs on telomere biology and telomeres diseases, such as cancer and aging.

  6. Microzooplankton biomass distribution in Terra Nova Bay, Ross Sea (Antarctica)

    Science.gov (United States)

    Fonda Umani, S.; Monti, M.; Nuccio, C.

    1998-11-01

    This work describes the spatial and vertical distribution of microzooplankton (20-200 μm) abundance and biomass of the upper layers (0-100 m), collected during the first oceanographic Italian expedition in Antarctica (1987/1988) in Terra Nova Bay (Ross Sea). Biomass was estimated by using biovolume calculations and literature conversion factors. Sampling was carried out at three depths, surface, 50 and 100 m. The dominant taxa were made up of tintinnid ciliates, ciliates other than tintinnids, larvae of micrometazoa and heterotrophic dinoflagellates. The abundance of the total microplankton fraction had its absolute maximum in the center of Terra Nova Bay at the surface with 31 042 ind. dm -3. The areal and vertical distribution of heterotrophic microplankton biomass differs from that of abundance. On the basis of hydrological conditions, phytoplankton composition and biomass and microzooplankton biomass and structure it is possible to identify three groups of stations: 1—northern coastal stations (intermediate chlorophyll maxima, microphytoplankton prevalence, low microzooplankton biomass); 2—central stations (high surface chlorophyll, nanoplankton prevalence, high abundance of microzooplankton); 3—northern stations (deeper pycnocline, nanoplankton prevalence, high microzooplankton biomass at intermediate depths).

  7. JUVENTUDE ASSENTADA E A IDENTIDADE VINCULADA COM A TERRA

    Directory of Open Access Journals (Sweden)

    Leandro Gomes Reis Lopes

    2017-08-01

    Full Text Available Resumo Este estudo tem como foco analisar a construção da identidade vinculada à terra pela juventude de um assentamento rural organizado pelo Movimento dos Trabalhadores Rurais Sem-Terra (MST em Teresina, Piauí. O conceito de apropriação do espaço da Psicologia Ambiental, em estreita articulação com a Psicologia Social de base histórico-cultural, foi o referencial analítico para compreender esse processo. As informações foram obtidas por meio de grupo focal com o Coletivo de Jovens, já existente no assentamento. As entrevistas foram gravadas e transcritas e realizada Análise de Conteúdo Temática, por meio da qual se obteve como categorias as identidades: homogênea, enriquecida, de luta e de contraste. Apesar das diferenças existentes, elas têm em comum a inserção numa história do homem do campo e do assentamento, como as atividades exercidas pelos sujeitos no espaço em que vivem.

  8. Status of Terra MODIS Operation, Calibration, and Performance

    Science.gov (United States)

    Xiong, X.; Wenny, B.; Wu, A.; Angal, A.; Geng, X.; Chen, H.; Dodd, J.; Link, D.; Madhavan, S.; Chen, N.; hide

    2014-01-01

    Since launch in December 1999, Terra MODIS has successfully operated for nearly 15 years, making continuous observations. Data products derived from MODIS observations have significantly contributed to a wide range of studies of key geophysical parameters of the earth's eco-system of land, ocean, and atmosphere, and their changes over time. The quality of MODIS data products relies on the dedicated effort to monitor and sustain instrument health and operation, to calibrate and update sensor parameters and properties, and to improve calibration algorithms. MODIS observations are made in 36 spectral bands, covering wavelengths from visible to long-wave infrared. The reflective solar bands (1-19 and 26) are primarily calibrated by a solar diffuser (SD) panel and regularly scheduled lunar observations. The thermal emissive bands (20-25 and 27- 36) calibration is referenced to an on-board blackbody (BB) source. On-orbit changes in the sensor spectral and spatial characteristics are monitored by a spectroradiometric calibration assembly (SRCA). This paper provides an overview of Terra MODIS on-orbit operation and calibration activities and implementation strategies. It presents and summarizes sensor on-orbit performance using nearly 15 years of data from its telemetry, on-board calibrators, and lunar observations. Also discussed in this paper are changes in sensor characteristics, corrections applied to maintain MODIS level 1B (L1B) data quality, and efforts for future improvements.

  9. 75 FR 5780 - Green Borders Geothermal, LLC, Complainant, v. Terra-Gen Dixie Valley, LLC, Respondent; Notice of...

    Science.gov (United States)

    2010-02-04

    ... Energy Regulatory Commission Green Borders Geothermal, LLC, Complainant, v. Terra-Gen Dixie Valley, LLC... Geothermal, LLC (Green Borders) filed a formal complaint against Terra-Gen Dixie Valley, LLC (f/k/a Caithness Dixie Valley, LLC) (Terra-Gen) pursuant to section 206 of the Federal Power Act, and 18 CFR 385.206...

  10. Morfeia generalizada em uma criança com ictiose arlequim, uma associação rara

    Directory of Open Access Journals (Sweden)

    Maria F.A. Giacomin

    2016-02-01

    Full Text Available Resumo Introdução Ictiose arlequim é uma doença cutânea congênita grave, autossômica e rara, caracterizada por ressecamento excessivo da pele e hiperqueratose. A associação de ictiose com esclerose sistêmica foi descrita em apenas três crianças. Ainda não foi descrito nenhum paciente com morfeia generalizada (MG associada à ictiose arlequim. Relato de caso: Menina de quatro anos e seis meses de idade com diagnóstico de ictiose arlequim baseado em espessamento cutâneo difuso, com fissuras, descamação, eritema e sangramento da lesão desde as primeiras horas de vida. A paciente foi tratada com acitretina (1,0 mg/kg/dia e creme emoliente. Aos três anos e nove meses, desenvolveu contraturas musculares com dor à movimentação e limitação nos cotovelos e joelhos e placas esclerodérmicas difusas no abdômen, nas costas, na região suprapúbica e nas extremidades inferiores. A biópsia de pele mostrou epiderme retificada e hiperqueratose leve, derme reticular com linfócitos, infiltrado mononuclear perivascular e perianexial e esclerose da derme reticular e glândula sudorípara rodeada por um tecido colágeno denso, compatível com esclerodermia. A paciente preencheu os critérios para o subtipo MG. Metotrexato e prednisona foram introduzidos. Aos quatro anos e três meses, apresentou novas lesões esclerodérmicas, associando-se azatioprina à terapêutica anterior, sem resposta após dois meses. Discussão: Um caso de ictiose arlequim associada à MG foi descrito. O tratamento dessas duas condições é um desafio e requer uma equipe multidisciplinar.

  11. Gaultheria nubigena (Ericaceae, una especie rara en la Argentina Gaultheria nubigena (Ericaceae, a rare species in Argentina

    Directory of Open Access Journals (Sweden)

    Paula M. Hermann

    2006-12-01

    Full Text Available A lo largo de los aproximadamente 20 años de colección de material para el estudio del desarrollo floral de Ericaceae en los bosques subantárticos de Argentina, ocho de las nueve especies allí existentes fueron fácilmente encontradas. La excepción fue Gaultheria nubigena . Es una especie rara; cincuenta y dos años pasaron desde su colección en 1952 hasta una más reciente en 2004; en esta oportunidad fue encontrada en una nueva localidad. Se reiniciaron búsquedas durante diciembre de 2005 y enero de 2006 que resultaron en la ubicación de la especie en la nueva localidad (Lago Gutiérrez y en una de las ya conocidas (Cascada Los Alerces; ambas poblaciones sólo cuentan con siete a diez individuos. La mayoría de los lugares visitados, con un hábitat supuestamente adecuado para encontrar más poblaciones, dieron resultados negativos. De acuerdo a la información disponible hasta el momento, se la considera en la categoría Vulnerable (VU de la UICN.During approximately 20 years of collecting material for floral development studies of Ericaceae in the subantarctic forests of Argentina, eight species of the nine that occur there were easily found. The exception was G. nubigena . It is a rare species; fifty-two years have elapsed since its collection in 1952 and more recently in 2004 when it was found in a new locality. Renewed searches during Dec. 2005 and Jan. 2006 resulted in the location of the species in the new locality (Lago Gutiérrez and one of the previously known ones (Cascada Los Alerces; both populations consist of no more than seven to ten individuals. Most of the supposedly appropriate habitats visited in order to find new populations yielded negative results. According to the information available it will be considered as Vulnerable (VU in the IUCN categories.

  12. Establishment of a humanized APL model via the transplantation of PML-RARA-transduced human common myeloid progenitors into immunodeficient mice.

    Directory of Open Access Journals (Sweden)

    Hiromichi Matsushita

    Full Text Available Recent advances in cancer biology have revealed that many malignancies possess a hierarchal system, and leukemic stem cells (LSC or leukemia-initiating cells (LIC appear to be obligatory for disease progression. Acute promyelocytic leukemia (APL, a subtype of acute myeloid leukemia characterized by the formation of a PML-RARα fusion protein, leads to the accumulation of abnormal promyelocytes. In order to understand the precise mechanisms involved in human APL leukemogenesis, we established a humanized in vivo APL model involving retroviral transduction of PML-RARA into CD34(+ hematopoietic cells from human cord blood and transplantation of these cells into immunodeficient mice. The leukemia well recapitulated human APL, consisting of leukemic cells with abundant azurophilic abnormal granules in the cytoplasm, which expressed CD13, CD33 and CD117, but not HLA-DR and CD34, were clustered in the same category as human APL samples in the gene expression analysis, and demonstrated sensitivity to ATRA. As seen in human APL, the induced APL cells showed a low transplantation efficiency in the secondary recipients, which was also exhibited in the transplantations that were carried out using the sorted CD34- fraction. In order to analyze the mechanisms underlying APL initiation and development, fractionated human cord blood was transduced with PML-RARA. Common myeloid progenitors (CMP from CD34(+/CD38(+ cells developed APL. These findings demonstrate that CMP are a target fraction for PML-RARA in APL, whereas the resultant CD34(- APL cells may share the ability to maintain the tumor.

  13. Establishment of a humanized APL model via the transplantation of PML-RARA-transduced human common myeloid progenitors into immunodeficient mice.

    Science.gov (United States)

    Matsushita, Hiromichi; Yahata, Takashi; Sheng, Yin; Nakamura, Yoshihiko; Muguruma, Yukari; Matsuzawa, Hideyuki; Tanaka, Masayuki; Hayashi, Hideki; Sato, Tadayuki; Damdinsuren, Anar; Onizuka, Makoto; Ito, Mamoru; Miyachi, Hayato; Pandolfi, Pier Paolo; Ando, Kiyoshi

    2014-01-01

    Recent advances in cancer biology have revealed that many malignancies possess a hierarchal system, and leukemic stem cells (LSC) or leukemia-initiating cells (LIC) appear to be obligatory for disease progression. Acute promyelocytic leukemia (APL), a subtype of acute myeloid leukemia characterized by the formation of a PML-RARα fusion protein, leads to the accumulation of abnormal promyelocytes. In order to understand the precise mechanisms involved in human APL leukemogenesis, we established a humanized in vivo APL model involving retroviral transduction of PML-RARA into CD34(+) hematopoietic cells from human cord blood and transplantation of these cells into immunodeficient mice. The leukemia well recapitulated human APL, consisting of leukemic cells with abundant azurophilic abnormal granules in the cytoplasm, which expressed CD13, CD33 and CD117, but not HLA-DR and CD34, were clustered in the same category as human APL samples in the gene expression analysis, and demonstrated sensitivity to ATRA. As seen in human APL, the induced APL cells showed a low transplantation efficiency in the secondary recipients, which was also exhibited in the transplantations that were carried out using the sorted CD34- fraction. In order to analyze the mechanisms underlying APL initiation and development, fractionated human cord blood was transduced with PML-RARA. Common myeloid progenitors (CMP) from CD34(+)/CD38(+) cells developed APL. These findings demonstrate that CMP are a target fraction for PML-RARA in APL, whereas the resultant CD34(-) APL cells may share the ability to maintain the tumor.

  14. Terra Nullius: Colonial Violence in Prynne’s Acrylic Tips

    Directory of Open Access Journals (Sweden)

    Matthew Hall

    2016-06-01

    Full Text Available Examining J.H. Prynne’s 'Acrylic Tips' through a series of analogous readings, this paper identifies the location, characters, and themes of the poem. By examining the poem and the contiguities with 'Her Weasel’s Wild Returning', 'Acrylic Tips' is positioned against the historical decree of terra nullius over the sovereign land of Australia. The poem is read against and situated in the colonial and linguistic history of Australia. Read as a pastoral elegy, the poem depicts a hierarchy of human dominance over nature, which finds its ends in the colonial shearing shed, as well as the genetic laboratory. These positions are ultimately argued to be socio-political by-products of the colonial dominance of Indigenous culture and nature.

  15. Summary of Aqua, Aura, and Terra High Interest Events

    Science.gov (United States)

    Newman, Lauri

    2015-01-01

    Single-obs tracking Sparsely tracked objects are an unfortunate reality of CARA operations Terra vs. 32081: new track with bad data was included in OD solution for secondary object and risk became high CARA and JSpOC discussed tracking and OSAs threw out the bad data. Event no longer presented high risk based on new OD Improvement: CARA now sends JSpOC a flag indicating when a single obs is included, so OSAs can evaluate if manual update to OD is required. Missing ASW OCMsAura vs. 87178, TCA: 317 at 08:04 UTC. Post-maneuver risk (conjunction was identified in OO results)CARA confirmed with JSpOC that ASW OCMs should have been received in addition to OO OCMsJSpOC corrected the manual error in their script that prevented the data from being delivered to CARAJSpOC QAd their other scripts to ensure this error did not exist in other places.

  16. DINÂMICA ESPACIAL E TEMPORAL DO USO DAS TERRAS E ÍNDICE DE VEGETAÇÃO POR DIFERENÇA NORMALIZADA (NDVI EM SETOR DE CABECEIRA DO RIO SÃO LOURENÇO, CAMPO VERDE, MT

    Directory of Open Access Journals (Sweden)

    Anny Keli Aparecida Alves Cândido

    2015-06-01

    Full Text Available Avaliou-se a dinâmica espacial e temporal do uso do solo na microbacia que contém a nascente do Rio São Lourenço, situada no bioma Cerrado. Foram utilizadas imagens orbitais obtidas pelo sensor Mapeador Temático (TM do Landsat 5, referentes à órbita/ponto 226/71 dos anos de 1985, 1997 e 2011, com resolução espacial de 30 metros, compreendendo um período de 26 anos. O mapa de uso das terras foi gerado a partir de classificação supervisionada, utilizando o algoritmo Máximo Verossimilhança. O Índice de vegetação por diferença normalizada (NDVI foi gerado a partir das bandas 4 e 3 correspondentes ao infravermelho próximo e ao vermelho, respectivamente. Verificou-se que mais de 78% da área da microbacia é destinada à agricultura. A classe floresta aumentou no decorrer dos anos analisados, fato este explicado pelo plantio de floresta de eucalipto, no setor norte da microbacia. O NDVI evidenciou áreas que estavam com pouca biomassa vegetal, diferenciando-as das áreas com cobertura vegetal densa. Considerando o NDVI de uma área em processo de recuperação ambiental, denominada de unidade demonstrativa de restauração ecológica, observou-se que com nove meses de implantação, a mesma ainda não apresenta resposta espectral semelhante à mata ciliar adjacente. As matas ciliares da microbacia representam potenciais corredores de dispersão de fluxo biológico, que conectam áreas de planalto situadas no bioma Cerrado à planície sedimentar do Pantanal situada no sudoeste de Mato Grosso. A pesquisa fornece subsídios para a adequação ambiental das propriedades rurais junto à legislação ambiental pertinente.

  17. TERRA Battery Thermal Control Anomaly - Simulation and Corrective Actions

    Science.gov (United States)

    Grob, Eric W.

    2010-01-01

    The TERRA spacecraft was launched in December 1999 from Vandenberg Air Force Base, becoming the flagship of NASA's Earth Observing System program to gather data on how the planet's processes create climate. Originally planned as a 5 year mission, it still provides valuable science data after nearly 10 years on orbit. On October 13th, 2009 at 16:23z following a routine inclination maneuver, TERRA experienced a battery cell failure and a simultaneous failure of several battery heater control circuits used to maintain cell temperatures and gradients within the battery. With several cells nearing the minimum survival temperature, preventing the electrolyte from freezing was the first priority. After several reset attempts and power cycling of the control electronics failed to reestablish control authority on the primary side of the controller, it was switched to the redundant side, but anomalous performance again prevented full heater control of the battery cells. As the investigation into the cause of the anomaly and corrective action continued, a battery thermal model was developed to be used in determining the control ability remaining and to simulate and assess corrective actions. Although no thermal model or detailed reference data of the battery was available, sufficient information was found to allow a simplified model to be constructed, correlated against pre-anomaly telemetry, and used to simulate the thermal behavior at several points after the anomaly. It was then used to simulate subsequent corrective actions to assess their impact on cell temperatures. This paper describes the rapid development of this thermal model, including correlation to flight data before and after the anomaly., along with a comparative assessment of the analysis results used to interpret the telemetry to determine the extent of damage to the thermal control hardware, with near-term corrective actions and long-term operations plan to overcome the anomaly.

  18. Modelo de gestión para la atención integral de pacientes con enfermedades huérfanas o raras en Colombia

    OpenAIRE

    Córdoba Buriticá, Juan Pablo; Salinas Nova, María Angélica

    2016-01-01

    Las enfermedades raras o huérfanas corresponden a aquellas con baja prevalencia en la población, y en varios países tienen una definición distinta de acuerdo con el número de pacientes que afectan en la población. La Organización Mundial de la Salud (OMS), las define como un trastorno que afecta de 650 a 1.000 personas por millón de habitantes, de las que se han identificado alrededor de 7.000. En Colombia su prevalencia es menor de 1 por cada 5.000 personas y comprenden: las enfermedades rar...

  19. Retocolite ulcerativa e artrite reumatoide: uma rara associação - relato de caso Ulcerative colitis and rheumatoid arthritis: a rare association - case report

    OpenAIRE

    Vitor Alves Cruz; Lúcio Yamaguchi; Carolina Nazeozeno Ribeiro; Vanessa de Oliveira Magalhães; Jozelia Rego; Nilzio Antonio da Silva

    2012-01-01

    A retocolite ulcerativa é uma desordem autoimune de etiologia desconhecida. Embora o intestino grosso represente o principal foco de autoimunidade, trata-se, na verdade, de uma doença sistêmica com inúmeras manifestações extraintestinais, inclusive articulares. A associação frequente entre diversas doenças autoimunes em um mesmo paciente é descrita na literatura. No entanto, é rara a coexistência entre retocolite ulcerativa e artrite reumatoide. Os autores relatam um caso de retocolite ulcera...

  20. Técnicas de abordaje del estrés y la ansiedad: aplicación a pacientes con enfermedades raras

    OpenAIRE

    Pérez Jaramillo, Ana María

    2016-01-01

    Las enfermedades raras afectan a la calidad de vida de más de 3.000.000 de personas en nuestro país incluyendo pacientes y familiares, sometiéndolas a múltiples situaciones de estrés y generando altos niveles de ansiedad. Al igual que otros factores ambientales, estas alteraciones emocionales tienen una repercusión directa sobre la salud, siendo necesario realizar una intervención psicosocial preventiva y promotora del bienestar emocional a fin de prevenir consecuencias nefasta...

  1. Regulation of TERRA on telomeric and mitochondrial functions in IPF pathogenesis.

    Science.gov (United States)

    Gao, Yulin; Zhang, Jinjin; Liu, Yuxia; Zhang, Songzi; Wang, Youlei; Liu, Bo; Liu, Huizhu; Li, Rongrong; Lv, Changjun; Song, Xiaodong

    2017-12-02

    Aging is a known risk factor of idiopathic pulmonary fibrosis (IPF). However, the pathogenic mechanisms underlying the effects of advanced aging remain largely unknown. Telomeric repeat-containing RNA (TERRA) represents a type of long noncoding RNA. In this study, the regulatory roles of TERRA on human telomeres and mitochondria and IPF epithelial injury model were identified. Blood samples were collected from patients with IPF (n = 24) and matched control individuals (n = 24). The significance of clinical research on the TERRA expression correlated with pulmonary fibrosis was assessed. The expression levels of TERRA in vivo and in vitro were determined through quantitative real-time polymerase chain reaction analysis. Telomerase activity was observed using a fluorescent quantitative TRAP assay kit. The functions of telomeres, mitochondria, and associated genes were analyzed through RNA interference on TERRA. TERRA expression levels significantly increased in the peripheral blood mononuclear cells of IPF patients. The expression levels also exhibited a direct and significantly inverse correlation with the percentage of predicted force vital capacity, which is a physiological indicator of fibrogenesis during IPF progression. This finding was confirmed in the epithelial injury model of IPF in vitro. RNA interference on TERRA expression can ameliorate the functions of telomeres; mitochondria; associated genes; components associated with telomeres, such as telomerase reverse transcriptase, telomerase, and cell nuclear antigen, cyclin D1; and mitochondria-associated cyclin E genes, including the MMP and Bcl-2 family. The RNA interference on TERRA expression can also improve the functions of oxidative-stress-associated genes, such as reactive oxygen species, superoxide dismutase, and catalase, and apoptosis-related genes, such as cytochrome c, caspase-9, and caspase-3. In this study, the regulation of TERRA expression on telomeres and mitochondria during IPF

  2. Development and validation of a 3-Plex RT-qPCR assay for the simultaneous detection and quantitation of the three PML-RARa fusion transcripts in acute promyelocytic leukemia.

    Directory of Open Access Journals (Sweden)

    Zhanguo Chen

    Full Text Available Rapid diagnosis of acute promyelocytic leukemia (APL with promyelocytic leukemia-retinoic acid receptor alpha (PML-RARa contributes to a highly effective therapy with all-trans retinoic acid (ATRA. Real-time quantitative reverse transcription-polymerase chain reaction (RT-qPCR is a valuable tool to diagnose APL with PML-RARa. However, a single RT-qPCR analysis, which is laborious and costly, has to be performed in three reactions to determine whether one of the three PML-RARa transcripts is present and to quantify the involved transcript. This paper describes a novel TaqMan MGB probe-based 3-plex RT-qPCR assay in a single reaction to detect simultaneously the three PML-RARa transcripts. Specific primers and probe were designed, and the results were further normalized to the Abelson gene. The detection results for the serially diluted plasmid indicate that the analytical sensitivity was 10 copies per reaction for PML-RARa bcr1, bcr2, and bcr3. A relatively high sensitivity of 10-4 was achieved with this assay when analyzing the bcr1 transcripts obtained from the NB4 cell line. The reproducibility was satisfactory because the coefficients of variation of cycle threshold values were less than 3% for both inter- and intra-assays. After testing 319 newly diagnosed patients with leukemia (including 61 APL cases, the results of the 3-plex RT-qPCR assay completely agreed with the traditional methods used for the detection of PML-RARa. The quantitative results of the 3-plex RT-qPCR were highly correlated with the single RT-qPCR and showed similar assay sensitivity for 60 PML-RARa positive APL samples at diagnosis and 199 samples from 57 patients during follow-up. Interestingly, one PML-RARa bcr2 case at diagnosis with breakpoint at 1579, which was not detected by the single RT-q-PCR, was detected by the 3-plex RT-qPCR assay. The 3-plex RT-qPCR assay is a specific, sensitive, stable, and cost-effective method that can be used for the rapid diagnosis and

  3. FT-IR spectroscopic study of terra-cotta sarcophagi recently excavated in Ainos (Enez) Turkey

    Science.gov (United States)

    Kurap, Gulnur; Akyuz, Sevim; Akyuz, Tanil; Basaran, Sait; Cakan, Banu

    2010-07-01

    In this study, painting materials and body samples of the decorated terra-cotta sarcophagi, and the body samples of six terra-cotta sarcophagi, recently excavated in Ancient Ainos (Enez) Turkey, were investigated, using the FT-IR spectrometry. EDXRF spectrometry was used as a complementary technique. The experimental results allowed us to identify the mineralogical composition of body samples and main pigments of the decorated parts of the terra-cotta sarcophagi. Spectroscopic results revealed that the investigated samples were fired to a temperature less than 750 °C, in the oxidising atmosphere.

  4. Compatibilidade entre as paredes e respectivos revestimentos em construções em terra crua

    OpenAIRE

    Faria, Paulina

    2004-01-01

    2º Seminário de Arquitectura de Terra em Portugal, Lisboa, Setembro 2004 Apresentam-se de forma genérica as principais patologias associadas às construções de terra crua, nomeadamente as relativas à acção da água. Ressaltam-se os problemas associados à acção dos sais solúveis higroscópicos. Relembram-se as exigências a cumprir pelos revestimentos de paredes, as características que estes devem possuir e a sua necessária compatibilidade com as paredes de terra. Apresentam-se as c...

  5. Dermatomiosite juvenil e linfoma de Hodgkin: uma rara associação Juvenile dermatomyositis and Hodgkin disease: a rare association

    Directory of Open Access Journals (Sweden)

    André Cavalcanti

    2007-12-01

    Full Text Available A dermatomiosite (DM em adultos está freqüentemente associada com câncer. Já na faixa etária pediátrica, a dermatomiosite juvenil (DMJ é predominantemente idiopática, e sua associação com neoplasia é rara e com base apenas em relatos de casos. Embora rara, a presença de neoplasia em pacientes com DMJ deve ser sempre suspeitada quando houver manifestações clínicas atípicas e alterações laboratoriais incomuns. A seguir, descrevemos e discutimos um caso de DMJ e linfoma de Hodgkin em uma adolescente.Dermatomyositis (DM in adults is frequently associated with cancer. In contrast, during childhood juvenile dermatomyositis (JDM is predominantly idiopathic and its association with neoplasia is rare and based only in case reports. Although rare, the presence of neoplasia in JDM patients must always be suspected in face of atypical clinical manifestations and uncommon laboratorial findings. We describe and discuss a case of JDM and Hodgkin disease in an adolescent.

  6. Yttrium and lanthanum recovery from low cerium carbonate, yttrium carbonate and yttrium concentrate; Aproveitamento de itrio e lantanio de um carbonato de terras raras de baixo teor em cerio, de um carbonato de itrio e de um oxido de terras itricas

    Energy Technology Data Exchange (ETDEWEB)

    Vasconcelos, Mari Estela de

    2006-07-01

    In this work, separation, enrichment and purification of lanthanum and yttrium were performed using as raw material a commercial low cerium rare earth concentrate named LCC (low cerium carbonate), an yttrium concentrate named 'yttrium carbonate', and a third concentrated known as 'yttrium earths oxide. The first two were industrially produced by the late NUCLEMON - NUCLEBRAS de Monazita e Associados Ltda, using Brazilian monazite. The 'yttrium earths oxide' come from a process for preparation of lanthanum during the course of the experimental work for the present thesis. The following techniques were used: fractional precipitation with urea; fractional leaching of the LCC using ammonium carbonate; precipitation of rare earth peroxycarbonates starting from the rare earth complex carbonates. Once prepared the enriched rare earth fractions the same were refined using the ion exchange chromatography with strong cationic resin without the use of retention ion and elution using the ammonium salt of ethylenediaminetetraacetic acid. With the association of the above mentioned techniques were obtained pure oxides of yttrium (>97,7%), lanthanum (99,9%), gadolinium (96,6%) and samarium (99,9%). The process here developed has technical and economic viability for the installation of a large scale unity. (author)

  7. MODIS/Terra Surface Reflectance Daily L3 Global 0.05Deg CMG V006

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD09CMG Version 6 product provides an estimate of the surface spectral reflectance of Terra MODIS Bands 1-7 resampled to 5600 m pixel resolution and corrected...

  8. Detailed geological mapping of the fluvial deposits in Magong crater, Xanthe Terra, Mars

    Science.gov (United States)

    Knade, J.; Hauber, E.; Platz, T.; Le Deit, L.; Kinch, K.

    2017-09-01

    We present a detailed geological map of a layered sedimentary deposit at the terminus of Sabrina Vallis in Xanthe Terra, Mars. This location shows diverse sedimentary and volcanic features which makes it an attractive place for future exploration, including rovers.

  9. Geologic Mapping in Southern Margaritifer Terra on Mars and the Evolution of Nirgal Vallis

    Science.gov (United States)

    Wilson, S. A.; Grant, J. A.; Buczkowski, D. L.

    2017-06-01

    The Margaritifer Terra region on Mars preserves a long and fascinating record of aqueous activity. Geologic mapping in four quadrangles helps constrain the timing, source, duration, and relative importance of aqueous versus other geomorphic processes.

  10. MODIS/Terra+Aqua Near Real Time L3 Value-added Aerosol Optical Depth

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  11. MODIS/Terra Near Real Time L3 Value-added Aerosol Optical Depth

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  12. MODIS/Terra L3 Value-added Aerosol Optical Depth - NRT

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  13. MODIS/Terra+Aqua L3 Value-added Aerosol Optical Depth - NRT

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  14. MODIS/Terra Aerosol 5-Min L2 Swath 10km V5.1

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  15. Biooxidation of Primary Alcohols to Aldehydes through Hydrogen Transfer Employing Janibacter terrae

    NARCIS (Netherlands)

    Orbegozo, Thomas; Vries, Johannes G. de; Kroutil, Wolfgang

    2010-01-01

    Chemoselective oxidations still represent a challenge for chemists. Lyophilized cells of Janibacter terrae were employed for the chemoselective oxidation of primary alcohols to the corresponding aldehydes by hydrogen transfer with the use of acetaldehyde as the hydrogen acceptor. Secondary alcohol

  16. MODIS/Terra Vegetation Continuous Fields Yearly L3 Global 250m SIN Grid V005

    Data.gov (United States)

    National Aeronautics and Space Administration — The Terra MODIS Vegetation Continuous Fields (VCF) product is a sub-pixel-level representation of surface vegetation cover estimates globally. Designed to...

  17. MODIS/Terra Vegetation Continuous Fields Yearly L3 Global 500m SIN Grid V051

    Data.gov (United States)

    National Aeronautics and Space Administration — The Terra MODIS Vegetation Continuous Fields (VCF) product is a sub-pixel-level representation of surface vegetation cover estimates globally. Designed to...

  18. Chlorophyll-a, Terra MODIS, OSU DB, 0.0125 degrees, West US, EXPERIMENTAL

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — NOAA CoastWatch distributes chlorophyll-a concentration data from NASA's Terra satellite. Measurements are gathered by the Moderate Resolution Imaging...

  19. Technology Demonstration Summary: Terra Vac In Situ Vacuum Extraction System, Groveland, Massachusetts

    Science.gov (United States)

    Terra Vac Inc's vacuum extraction system was demonstrated at the Valley Manufactured Products Company, Inc., site in Groveland, Massachusetts. The property is part of the Groveland Wells Superfund site and is contaminated mainly by trichloroethylene (TCE). Vacuum extraction...

  20. Retrieval of Aerosol Properties from MODIS Terra, MODIS Aqua, and VIIRS SNPP: Calibration Focus

    Science.gov (United States)

    Levy, Robert C.; Mattoo, Shana; Sawyer, Virginia; Kleidman, Richard; Patadia, Falguni; Zhou, Yaping; Gupta, Pawan; Shi, Yingxi; Remer, Lorraine; Holz, Robert

    2016-01-01

    MODIS-DT Collection 6 - Aqua/Terra level 2, 3; entire record processed - "Trending" issues reduced - Still a 15% or 0.02 Terra vs Aqua offset. - Terra/Aqua convergence improved with C6+, but bias remains. - Other calibration efforts yield mixed results. VIIRS-­-DT in development - VIIRS is similar, yet different then MODIS - With 50% wider swath, VIIRS has daily coverage - Ensures algorithm consistency with MODIS. - Currently: 20% NPP vs Aqua offset over ocean. - Only small bias (%) over land (2012-­-2016) - Can VIIRS/MODIS create aerosol CDR? Calibration for MODIS - VIIRS continues to fundamentally important. It's not just Terra, or just Aqua, or just NPP-­-VIIRS, I really want to push synergistic calibration.

  1. NAMMA MODIS/AQUA AND MODIS/TERRA DEEP BLUE PRODUCTS V1

    Data.gov (United States)

    National Aeronautics and Space Administration — The NAMMA MODIS/AQUA and MODIS/TERRA Deep Blue Products dataset is a collection of images depicting the aerosol optical depth derived from the MODIS deep blue...

  2. MODIS/Terra Surface Reflectance Daily L2G Global 250m SIN Grid V006

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD09GQ Version 6 product provides an estimate of the surface spectral reflectance of Terra MODIS 250 m bands 1-2 corrected for atmospheric conditions such as...

  3. Topographic Analyses of the Vestalia Terra plateau, Vesta (Invited)

    Science.gov (United States)

    Buczkowski, D.; Wyrick, D. Y.; Williams, D. A.; Preusker, F.; Roatsch, T.; DeSanctis, M. C.; Raymond, C. A.; Russell, C. T.

    2013-12-01

    The identification of Vestalia Terra, a topographically high region of Vesta bound by steep scarps, is itself a direct result of topographic analysis of the asteroid. However, additional analysis of the topography of the plateau has yielded important scientific discoveries. While most equatorial regions on Vesta display numerous wide and flat-floored troughs, Vestalia Terra does not. There are, however, three long pit crater chains on top of the plateau that are roughly aligned with the equatorial flat-floor troughs. Pit crater chains are a type of feature that have been observed on several planetary bodies and have been described as lines of circular to elliptical depressions which lack an elevated rim, ejecta deposits, or lava flows. Individual pits most commonly have a conical shape, sometimes with a flat floor, but in some cases they are elliptical in shape, with the long axis parallel to the chain orientation. Pit craters can in many cases coalesce into linear troughs, but the pits are often bordered by a graben (a down-dropped block bounded by normal faults) even before this coalesence. While pits are generally agreed to have formed by collapse into a subsurface cavity, the exact formation mechanisms hypothesized can vary from planet to planet. However, several researchers have suggested that pit crater chains on small bodies such as Phobos, Eros, Lutetia and Enceladus are formed by the drainage of a loose cover material into subsurface voids formed by dilation of a subsurface normal fault, a method described in extensive detail for pit crater chains on Mars. This formation hypothesis is strengthened by the strong correlation between pit crater chains and fault-bounded graben that has been observed and by the fact that pit chains are often in alignment with a regional fault and fracture system. There are two fundamental controls on the maximum size a pit can attain: the thickness of the overlying regolith and the amount of subsurface accommodation space. The

  4. Laranja-da-terra: potential citric fruit for Piauí State / Laranja-da-terra: fruta cítrica potencial para o Piauí

    Directory of Open Access Journals (Sweden)

    Ítalo Herbert Lucena Cavalcante

    2010-09-01

    Full Text Available The work had as objecive the phisico-chemical caracterization of laranja-da-terra fruits. Five samples of 10 fruits were harvested in laranja-da-terra plants produced in home orchards of the municipality of Bom Jesus/PI and caracterized by evaluation of lenght and width, number of the seeds per fruits, weigth, soluble solids (SS, titulable acidity (TA, vitamin C and SS/AT ratio. Laranja-da-terra has good quality phisico-chemical and is a natural source of vitamin C with an average of 125.76 mg/100g of fresh fruit, low titratable acidity and high values of soluble solids and SS/AT ratio.O trabalho teve como objetivo a caracterização físico-química de frutos de laranja-da-terra (Ctrius aurantium L. Cinco amostras de dez frutos cada foram colhidas em plantas de laranja-da-terra produzidos em pomares domésticos do município de Bom Jesus/PI e caracterizadas pela avaliação de diâmetro e altura, número de sementes por fruto, massa de frutos sólidos solúveis (SS, acidez titulavel (AT, vitamina C e relação SS/AT. A laranja-da-terra tem boas qualidades físico-quimicas e é uma fonte natural de vitamina C com media de 125,76 mg/100g de fruta fresca, com acidez baixa e elevados sólidos solúveis e “ratio”.

  5. Terra-Drill program: progress report and program plan. [Prefracturing using 50 caliber steel projectiles

    Energy Technology Data Exchange (ETDEWEB)

    Newsom, M.M.; Alvis, R.L.; Dardick, D.

    1976-06-01

    This report presents the status of the Terra-Drill development program as of May 31, 1976. The Terra-Drill system uses high velocity projectiles to prefracture the rock in front of a conventional rotary bit. The significant progress is reviewed and a long-range program plan is developed to indicate the level of effort required to bring this system to commercial production.

  6. Tectonics and volcanism of Eastern Aphrodite Terra, Venus - No subduction, no spreading

    Science.gov (United States)

    Hansen, Vicki L.; Phillips, Roger J.

    1993-01-01

    Eastern Aphrodite Terra, a deformed region with high topographic relief on Venus, has been interpreted as analogous to a terrestrial extensional or convergent plate boundary. However, analysis of geological and structural relations indicates that the tectonics of eastern Aphrodite Terra is dominated by blistering of the crust by magma diapirs. The findings imply that, within this region, vertical tectonism dominates over horizontal tectonism and, consequently, that this region is neither a divergent nor a convergent plate boundary.

  7. TerraFERMA: Harnessing Advanced Computational Libraries in Earth Science

    Science.gov (United States)

    Wilson, C. R.; Spiegelman, M.; van Keken, P.

    2012-12-01

    Many important problems in Earth sciences can be described by non-linear coupled systems of partial differential equations. These "multi-physics" problems include thermo-chemical convection in Earth and planetary interiors, interactions of fluids and magmas with the Earth's mantle and crust and coupled flow of water and ice. These problems are of interest to a large community of researchers but are complicated to model and understand. Much of this complexity stems from the nature of multi-physics where small changes in the coupling between variables or constitutive relations can lead to radical changes in behavior, which in turn affect critical computational choices such as discretizations, solvers and preconditioners. To make progress in understanding such coupled systems requires a computational framework where multi-physics problems can be described at a high-level while maintaining the flexibility to easily modify the solution algorithm. Fortunately, recent advances in computational science provide a basis for implementing such a framework. Here we present the Transparent Finite Element Rapid Model Assembler (TerraFERMA), which leverages several advanced open-source libraries for core functionality. FEniCS (fenicsproject.org) provides a high level language for describing the weak forms of coupled systems of equations, and an automatic code generator that produces finite element assembly code. PETSc (www.mcs.anl.gov/petsc) provides a wide range of scalable linear and non-linear solvers that can be composed into effective multi-physics preconditioners. SPuD (amcg.ese.ic.ac.uk/Spud) is an application neutral options system that provides both human and machine-readable interfaces based on a single xml schema. Our software integrates these libraries and provides the user with a framework for exploring multi-physics problems. A single options file fully describes the problem, including all equations, coefficients and solver options. Custom compiled applications are

  8. Katabatic wind forcing of the Terra Nova Bay polynya

    Science.gov (United States)

    Bromwich, David H.; Kurtz, Dennis D.

    The Terra Nova Bay polynya is a perennial winter feature in the western Ross Sea, Antarctica, which occupies roughly 1000 km2, it is formed and maintained by the combined influence of persistent katabatic winds, which advect newly formed bay ice eastward, and the Drygalski Ice Tongue, which prevents northward drifting pack ice from entering Terra Nova Bay. Existence of anomalously strong katabatic drainage along this coast is predicted by Parish's (1982) simulation of wintertime airflow which reveals a pronounced confluence of surface winds upslope from the Reeves Glacier where the winds are further focused by local topography. The simulation is strongly supported by regional sastrugi orientations. Average wintertime atmospheric conditions and ice sheet topography which control surface air drainage are stable on a climatic time scale; therefore, persistent wintertime katabatic winds should be an annual phenomenon. Further evidence comes from multi-year Landsat images which consistently show windswept, snowfree areas on the Reeves Glacier. In marked contrast to typical Antarctic katabatic winds, strong persistent winter winds are observed at sea level ˜25 km beyond the coastal slope break. Air probably descends as bora-type winds and is likely to be significantly denser than the air at sea level; conditions are not favorable for hydraulic jumps apparently typical of other katabatic regimes. The horizontal density difference is maintained during airflow across the Nansen Ice Sheet because relatively little air mass modification occurs there in contrast to situations where air moves over an ice-laden ocean. Observations thus suggest that katabatic winds maintain their identity for some distance seaward of the coast; qualitative trajectory calculations indicate that for representative geostrophic conditions this distance is on the order of the observed polynya width. Estimated ice freezing rates are ˜20 cm day-1, but wind-generated waves and currents prevent ice from

  9. A three-state model for the regulation of telomerase by TERRA and hnRNPA1.

    Science.gov (United States)

    Redon, Sophie; Zemp, Ivo; Lingner, Joachim

    2013-10-01

    Telomeres, the physical ends of eukaryotic chromosomes, are transcribed into telomeric repeat-containing RNA (TERRA), a large non-coding RNA, which forms an integral part of telomeric heterochromatin. In vitro, naked TERRA molecules are efficient inhibitors of human telomerase, base-pairing via their 5'-UUAGGG-3' repeats with the template sequence of telomerase RNA, in addition to contacting the telomerase reverse transcriptase protein subunit. In vivo, however, TERRA-mediated inhibition of telomerase can be prevented by unknown mechanisms. Also, heterogeneous nuclear ribonucleoprotein A1 (hnRNPA1) has been implicated in telomere length control. In vivo, TERRA is partially associated with hnRNPA1, and hnRNPA1 is also detected at telomeres. We demonstrate that on binding of TERRA, hnRNPA1 can alleviate the TERRA-mediated inhibition of telomerase. However, when in excess over TERRA, hnRNPA1 becomes itself an inhibitor of telomere extension, on binding of the telomeric DNA substrate. Yet, hnRNPA1 has no notable direct effects on the telomerase catalysis. Our in vitro results suggest that TERRA-mediated telomerase inhibition may be prevented by hnRNPA1 in vivo. Telomere extension by telomerase may require balanced levels of TERRA and hnRNPA1 at telomeres. Thus, TERRA and hnRNPA1 can function as a bimolecular regulator to turn telomerase and the telomere on and off.

  10. From Soup to Nuts: How Terra has enabled the growth of NASA Earth science communication

    Science.gov (United States)

    Ward, K.; Carlowicz, M. J.; Allen, J.; Voiland, A.; Przyborski, P.

    2014-12-01

    The birth of NASA's Earth Observatory website in 1999 closely mirrored the launch of Terra and over the years its growth has paralleled that of the Earth Observing System (EOS) program. With the launch of Terra, NASA gained an extraordinary platform that not only promised new science capabilities but gave us the data and imagery for telling the stories behind the science. The Earth Observatory Group was founded to communicate these stories to the public. We will present how we have used the capabilities of all the Terra instruments over the past 15 years to expand the public's knowledge of NASA Earth science. The ever-increasing quantity and quality of Terra data, combined with technological improvements to data availability and services has allowed the Earth Observatory and, as a result, the greater science-aware media, to greatly expand the visibility of NASA data and imagery. We will offer thoughts on best practices in using these multi-faceted instruments for public communication and we will share how we have worked with Terra science teams and affiliated systems to see the potential stories in their data and the value of providing the data in a timely fashion. Terra has allowed us to tell the stories of our Earth today like never before.

  11. Telomeric repeat-containing RNA TERRA: a noncoding RNA connecting telomere biology to genome integrity.

    Science.gov (United States)

    Cusanelli, Emilio; Chartrand, Pascal

    2015-01-01

    Telomeres are dynamic nucleoprotein structures that protect the ends of chromosomes from degradation and activation of DNA damage response. For this reason, telomeres are essential to genome integrity. Chromosome ends are enriched in heterochromatic marks and proper organization of telomeric chromatin is important to telomere stability. Despite their heterochromatic state, telomeres are transcribed giving rise to long noncoding RNAs (lncRNA) called TERRA (telomeric repeat-containing RNA). TERRA molecules play critical roles in telomere biology, including regulation of telomerase activity and heterochromatin formation at chromosome ends. Emerging evidence indicate that TERRA transcripts form DNA-RNA hybrids at chromosome ends which can promote homologous recombination among telomeres, delaying cellular senescence and sustaining genome instability. Intriguingly, TERRA RNA-telomeric DNA hybrids are involved in telomere length homeostasis of telomerase-negative cancer cells. Furthermore, TERRA transcripts play a role in the DNA damage response (DDR) triggered by dysfunctional telomeres. We discuss here recent developments on TERRA's role in telomere biology and genome integrity, and its implication in cancer.

  12. Structure of human telomeric RNA (TERRA): stacking of two G-quadruplex blocks in K(+) solution.

    Science.gov (United States)

    Martadinata, Herry; Phan, Anh Tuân

    2013-04-02

    Telomeric repeat-containing RNAs (TERRA) are transcription products of the telomeres. Human TERRA sequences containing UUAGGG repeats can form parallel-stranded G-quadruplexes. The stacking interaction of such structures was shown to be important for ligand targeting and higher-order arrangement of G-quadruplexes in long TERRA sequences. Here we report on the first high-resolution structure of a stacked G-quadruplex formed by the 10-nucleotide human TERRA sequence r(GGGUUAGGGU) in potassium solution. This structure comprises two dimeric three-layer parallel-stranded G-quadruplex blocks, which stack on each other at their 5'-ends. The adenine in each UUA loop is nearly coplanar with the 5'-end G-tetrad forming an A·(G·G·G·G)·A hexad, thereby increasing the stacking contacts between the two blocks. Interestingly, this stacking and loop conformation is different from all structures previously reported for the free human TERRA but resembles the structure previously determined for a complex between a human TERRA sequence and an acridine ligand. This stacking conformation is a potential target for drugs that recognize or induce the stacking interface.

  13. Genomic origin and nuclear localization of TERRA telomeric repeat-containing RNA: from Darkness to Dawn.

    Science.gov (United States)

    Diman, Aurélie; Decottignies, Anabelle

    2017-12-14

    Long noncoding RNAs, produced from distinct regions of the chromosomes, are emerging as new key players in several important biological processes. The long noncoding RNAs add a new layer of complexity to cellular regulatory pathways, from transcription to cellular trafficking or chromatin remodeling. More than 25 years ago, the discovery of a transcriptional activity at telomeres of protozoa ended the long-lasting belief that telomeres were transcriptionally silent. Since then, progressively accumulating evidences established that production of TElomeric Repeat-containing RNA (TERRA) was a general feature of eukaryotic cells. Whether TERRA molecules always originate from the telomeres or whether they can be transcribed from internal telomeric repeats as well is however still a matter of debate. Whether TERRA transcripts always localize to telomeres and play similar roles in all eukaryotic cells is also unclear. We review the studies on TERRA localization in the cell, its composition and some aspects of its transcriptional regulation to summarize the current knowledge and controversies about the genomic origin of TERRA, with a focus on human and mouse TERRA. © 2017 Federation of European Biochemical Societies.

  14. UMA PROPOSTA NO MODELO DE GESTÃO DOS RESÍDUOS SÓLIDOS GERADOS EM UM PAVILHÃO DE ABASTECIMENTO DE ALIMENTOS DO ESTADO DO RIO DE JANEIRO

    Directory of Open Access Journals (Sweden)

    Anaíza de S Teixeira

    2016-12-01

    Full Text Available Atualmente nas CEASAs são geradas inúmeras quantidades de resíduos. Em um dos Pavilhões de uma delas, observou-se que grande parte dos resíduos é proveniente da fonte orgânica, papel, madeira e plástico. Os resíduos gerados são coletados na maioria das vezes sem algum tipo de segregação e enviados para os aterros sanitários. Sendo assim, este trabalho propôs um modelo utilizando recipientes identificados para recicláveis e não recicláveis, tentando assim, agregar valor ao material reciclado e minimizar a quantidade enviada para os aterros sanitários dos demais materiais.

  15. Estudo da separação e aproveitamento da parte metálica e de óxidos presentes no resíduo gerado no corte de rochas ornamentais.

    OpenAIRE

    Eduardo Junca

    2009-01-01

    Este trabalho tem como objetivo o estudo do reaproveitamento da parte metálica e a caracterização dos óxidos presente no resíduo de granito gerado na etapa de desdobramento. Inicialmente, foi feita a caracterização química e física do resíduo através de análise química, difração de raios-X, microscopia eletrônica de varredura e análise granulométrica. Após a caracterização do resíduo, foi dado inicio aos processos para a recuperação do Fe metálico que envolveram: separação magnética, mesa con...

  16. Análise Sazonal das Regiões do Rio Grande do Sul Atingidas por Eventos Severos Gerados por SCM no Período de 2004 a 2008

    Directory of Open Access Journals (Sweden)

    Gustavo Rasera

    2012-07-01

    Full Text Available ntos Severos (ES, como por exemplo, vendaval, granizo e enchente, têm sido estudados com frequência devido à gravidade dos danos que estes causam à sociedade. Um dos sistemas meteorológicos que é bastante comum no Rio Grande do Sul (RS, e que frequentemente está associado aos ES são os Sistemas Convectivos de Mesoescala (SCM. Como a economia do RS é voltada majoritariamente para a agricultura, que é bastante suscetível às mudanças do tempo, é frequente no Estado a ocorrência de prejuízos econômicos causados por ES. Diante disso, o objetivo deste trabalho foi analisar a distribuição sazonal das regiões atingidas por ES gerados por SCM que afetaram o RS (ESSCMRS no período de 2004 a 2008. Foram utilizados, para o período de estudo, dados de ocorrências de ES e municípios atingidos por ES (MAES obtidos no banco de dados da Coordenadoria Estadual de Defesa Civil do RS; trajetórias dos SCM que afetaram o RS (SCMRS geradas a partir de informações fornecidas pela ferramenta ForTrACC (Forecasting and Tracking of Active Cloud Clusters e imagens brutas do satélite GOES 10 e 12 do canal 4. Os resultados obtidos mostraram que: i ~45% dos ES observados foram gerados por SCMRS; ii ~58% dos MAES foram atingidos por SCMRS; iii a porção norte do RS foi a mais atingida por ESSCMRS; iv vendaval e granizo foram os tipos de ESSCMRS que atingiram o maior número de municípios e v JAS (jul-ago-set foi o trimestre que apresentou o maior número de municípios atingidos por ESSCMRS (MAES-SCMRS.

  17. Bacillus terrae sp. nov. isolated from Cistus ladanifer rhizosphere soil.

    Science.gov (United States)

    Díez-Méndez, Alexandra; Rivas, Raúl; Mateos, Pedro F; Martínez-Molina, Eustoquio; Santín, Primitivo Julio; Sánchez-Rodríguez, Juan Antonio; Velázquez, Encarna

    2017-05-01

    A bacterial strain designated RA9T was isolated from a root of Cistus ladanifer in Spain. Phylogenetic analyses based on 16S rRNA gene sequences placed the isolate into the genus Bacillus with its closest relatives being Bacillus fortis R-6514T and Bacillus fordii R-7190T with 98.2 % similarity in both cases. DNA-DNA hybridization studies showed mean relatedness values of 29 and 30 %, respectively, between strain RA9T and the type strains of B. fortis and B. fordii. Cells of the isolate were Gram-stain-positive, motile, sporulating rods. Catalase and oxidase were positive. Gelatin, starch and casein were not hydrolysed. Menaquinone MK-7 was the only menaquinone detected and iso-C15 : 0 and anteiso-C15 : 0 were the major fatty acids. The polar lipid profile consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, one unidentified aminophospholipid, one unidentified phospholipid, one unidentifed glycolipid and one unidentified lipid. meso-Diaminopimelic acid was detected in the peptidoglycan. The DNA G+C content was 43.1 mol%. Phylogenetic, chemotaxonomic and phenotypic analyses showed that strain RA9T should be considered as representing a novel species of the genus Bacillus, for which the name Bacillus terrae sp. nov. is proposed. The type strain is RA9T (=LMG 29736T=CECT 9170T).

  18. Lutando por terra e vida! =Fighting for land and life

    Directory of Open Access Journals (Sweden)

    Lassak, Sandra

    2010-01-01

    Full Text Available O artigo analisa a situação das mulheres camponesas e seu trabalho em prol da justa distribuição da terra. Inicia com a afirmação da exclusão e da exploração da força do trabalho feminino no modelo dos colonatos, passando ao capitalismo, difusor do latifúndio e do agronegócio o estudo do papel exercido pelas mulheres, para chegar à reforma agrária e a mudança de relações sociais de gênero e, enfim, a resistência feminina por meio do movimento de mulheres camponesas. This article analyzes the situation of peasant women and their efforts towards a just distribution of land. It starts by affirming the fact that there is exclusion and exploitation of the feminine labor force within the structure of small colonies. It also shows the way capitalism helps diffuse agribusiness and large estate owners and the role women play to reach land reform and a change in the social relationships based on gender. Finally, it examines the feminine resistance through an organized movement of peasant women.

  19. Aoutomatic Oil Spill Detection Using TerraSAR-X Data

    Science.gov (United States)

    Zulipiye, Kaiyoumu; Balik Sanli, Fusun

    2016-07-01

    Oil release into the ocean may affect marine ecosystems and cause environmental pollution. Thus, oil spill detection and identification becomes critical important. Characterized by synoptic view over large regions, remote sensing has been proved to be a reliable tool for oil spill detection. Synthetic Aperture Radar (SAR) imagery shows returned signal that clearly distinguish oil from oil-free surface under optimal wind conditions, which makes it the most frequent used remote sensing technique in oil spill detection. Algorithms of automatic oil spill detection has already been developed for different SAR sensors, including RADARSAT and ENVISAT. In this study, we want to apply automatic oil spill detection algorithms on TerraSAR-X data which is previously developed for ASAR data. The applied methodology includes two steps as segmentation and classification. First segmentation algorithms compiled by C# have been applied under a Bayesian framework adopting a multi-level logistic. After segmentation different classification methods such as feature selection, filter, and embedded selection have been applied. As a result the used classifiers for oil spill detection will be compared, and the complete processing chain will be evaluated.

  20. A figura da Terra no pensamento medieval europeu

    Directory of Open Access Journals (Sweden)

    Carlos Henrique Oliveira da Rocha

    2017-03-01

    Full Text Available A Idade Média é um período histórico mal compreendido e difamado.  Podem ser elencados diversos preconceitos ensinados nas escolas e pela cultura em geral.  Especificamente, será tratado um deles neste trabalho: o mito de que o medievo acreditava em uma Terra plana.  O presente trabalho tem por objetivo, portanto, fornecer aos cartógrafos e geodesistas de língua portuguesa alguns argumentos comprovantes do equívoco desta ideia, muito propagada e hegemônica. Serão fornecidas provas bibliográficas e iconográficas.  Esta mudança de curso nos conhecimentos históricos faz-se cada vez mais premente, tendo em vista publicações modernas, inclusive técnicas, que ainda bebem nas fontes deste mito, tais obras ajudam a propagá-lo, passando-o às novas gerações.  Um objetivo secundário é incentivar a visita às fontes medievais e se embrenhar nesta sociedade tão diversa, mas tão bela e rica.

  1. Surface Current Measurements In Terra Nova Bay By Hf Radar

    Science.gov (United States)

    Flocco, D.; Falco, P.; Wadhams, P.; Spezie, G.

    We present the preliminary results of a field experiment carried out within frame- work of the CLIMA project of the Italian National Programme for Antarctic Research (PNRA) and in cooperation with the Scott Polar Research Institute of Cambridge. Dur- ing the second period (02/12/1999-23/01/2000) of the XV Italian expedition a coastal radar was used to characterize the current field in the area of Terra Nova Bay (TNB). One of the aims of the CLIMA (Climatic Long-term Interactions for the Mass balance in Antarctica) project is to determine the role of the polynya in the sea ice mass bal- ance, water structure and local climate. The OSCR-II experiment was planned in order to provide surface current measurements in the area of TNB polynya, one of the most important coastal polynya of the Ross Sea. OSCR (Ocean Surface Current Radar) is a shore based, remote sensing system designed to measure sea surface currents in coastal waters. Two radar sites (a master and a slave) provide with radial current mea- surements; data combined from both sites yield the total current vector. Unfortunately the master and slave stations did not work together throughout the whole period of the experiment. A description of the experiment and a discussion of the results, will be proposed.

  2. Estimating Terra MODIS Polarization Effect Using Ocean Data

    Science.gov (United States)

    Wald, Andrew E.; Brinkmann, Jake; Wu, Aisheng; Xiong, Jack

    2016-01-01

    Terra MODIS has been known since pre-launch to have polarization sensitivity, particularly in shortest-wavelength bands 8 and 9. On-orbit reflectance trending of pseudo-invariant sites show a variation in reflectance as a function of band and scan mirror angle of incidence consistent with time-dependent polarization effects from the rotating double-sided scan mirror. The MODIS Characterization Support Team [MCST] estimates the Mueller matrix trending from this variation as observed from a single desert site, but this effect is not included in Collection 6 [C6] calibration. Here we extend the MCSTs current polarization sensitivity monitoring to two ocean sites distributed over latitude to helpestimate the uncertainties in the derived Mueller matrix. The Mueller matrix elements derived for polarization-sensitive Band 8 for a given site are found to be fairly insensitive to surface brdf modeling. The site-to-site variation is a measure of the uncertainty in the Mueller estimation.Results for band 8 show that the polarization correction reduces mirror-side striping by up to 50% and reduces the instrument polarization effect on reflectance time series of an ocean target.

  3. Stars come down to Earth As estrelas descem à Terra

    Directory of Open Access Journals (Sweden)

    Luiz Marcelo Brandão Carneiro

    2009-09-01

    Full Text Available Stars come down to Earth — A little known essay by Theodor W. Adorno, Stars Come Down to Earth is a study about horoscopes and superstition, written in the form of an analysis for the astrology column of the Los Angeles Times in the early 1950s. The German philosopher points out that the texts offered to the reader are an amalgam of the rational and the irrational, revealing the frankly ideological meanderings of their object. Obra não muito conhecida de Theodor W. Adorno, As estrelas descem à Terra é um estudo sobre horóscopo e superstição, originalmente dirigido à coluna de astrologia do Los Angeles Times do início dos anos 1950. O filósofo alemão, pontuando os textos oferecidos aos leitores como um mistura entre o racional e o irracional, revela os meandros do caráter francamente ideológico de seu objeto.

  4. Especiación de tierras raras en las soluciones ácidas y neutras del sistema de drenaje del Arroyo del Val (Zaragoza

    Directory of Open Access Journals (Sweden)

    Zamora, A.

    1994-08-01

    -90 % of LREE and for 100 % of HREE. LnPO04 and Ln(PO43-2 complexes are quite significant compared to carbonate complexes, mainly in the speciation of HREE. These results il1ustrate the importance of phosphate ion concentration and REE phosphate complexation reactions in REEs speciation calculations.Las soluciones de la cuenca de drenaje del Arroyo del Val (Zaragoza presentan unas características geoquímicas muy diferenciadas, lo que las hace especialmente apropiadas para el estudio de diferentes aspectos acerca del comportamiento de los elementos de las Tierras Raras. Esta cuenca está constituida por un curso principal (Arroyo del Val de aguas ácidas (con valores de pH entre 3 y 4.5 e importantes concentraciones de sulfato, Al, Fe y distintos metales pesados al que desaguan varios afluentes de aguas bicarbonatadas (sulfatadas cálcicas (con valores de pH de hasta 7.5, alcalinidad apreciable y notables concentraciones de fosfato. En los puntos de confluencia del Arroyo del Val con los afluentes se producen espectaculares procesos de floculación de coloides ricos en aluminio, hierro y sulfato que tapizan el fondo del curso principal. Los elementos de las Tierras Raras fueron analizados en distintas muestras de aguas ácidas tomadas a lo largo de la cabecera del Arroyo del Val y en dos muestras de aguas neutras correspondientes a dos de los afluentes del sistema. Las concentraciones de estos elementos determinadas en las soluciones ácidas son, cuando menos, dos órdenes de magnitud superiores a las de las soluciones neutras y sus pautas de distribución (normalizadas frente a NASC muestran un marcado enriquecimiento en las Tierras Raras Intermedias (IREE; Eu-Tb. Los cálculos de especiación de REE realizados en las aguas ácidas muestran que estos elementos se encuentran de forma dominante como especies iónicas libres (Ln3+ ≈ 35 % y especialmente formando complejos con sulfato (LnSO+4 ≈ 60% y en menor proporción como Ln(SO4-2 ≈ 5%. Estos porcentajes

  5. Bringing Terra Science to the People: 10 years of education and public outreach

    Science.gov (United States)

    Riebeek, H.; Chambers, L. H.; Yuen, K.; Herring, D.

    2009-12-01

    The default image on Apple's iPhone is a blue, white, green and tan globe: the Blue Marble. The iconic image was produced using Terra data as part of the mission's education and public outreach efforts. As far-reaching and innovative as Terra science has been over the past decade, Terra education and public outreach efforts have been equally successful. This talk will provide an overview of Terra's crosscutting education and public outreach projects, which have reached into educational facilities—classrooms, museums, and science centers, across the Internet, and into everyday life. The Earth Observatory web site was the first web site designed for the public that told the unified story of what we can learn about our planet from all space-based platforms. Initially conceived as part of Terra mission outreach in 1999, the web site has won five Webby awards, the highest recognition a web site can receive. The Visible Earth image gallery is a catalogue of NASA Earth imagery that receives more than one million page views per month. The NEO (NASA Earth Observations) web site and WMS (web mapping service) tool serves global data sets to museums and science centers across the world. Terra educational products, including the My NASA Data web service and the Students' Cloud Observations Online (S'COOL) project, bring Terra data into the classroom. Both projects target multiple grade levels, ranging from elementary school to graduate school. S'COOL uses student observations of clouds to help validate Terra data. Students and their parents have puzzled over weekly "Where on Earth" geography quizzes published on line. Perhaps the most difficult group to reach is the large segment of the public that does not seek out science information online or in a science museum or classroom. To reach these people, EarthSky produced a series of podcasts and radio broadcasts that brought Terra science to more than 30 million people in 2009. Terra imagery, including the Blue Marble, have

  6. GEOTECNOLOGY APPLIED TO CURRENT LAND USE EVALUATION OF RIBEIRÃO JOÃO LEITE WATERSHED, GOIÁS, BRAZIL GEOTECNOLOGIA APLICADA NA AVALIAÇÃO DO USO DAS TERRAS DA MICROBACIA DO RIBEIRÃO JOÃO LEITE, GOIÁS

    Directory of Open Access Journals (Sweden)

    Marco Túlio Guimarães Silva

    2009-10-01

    ;">KEY-WORDS: Agricultural potential; geoprocessing; remote sensing; watersheds.

    O desenvolvimento agropecuário no Estado de Goiás demanda utilização crescente de terras, por vezes de maneira inadequada, podendo proporcionar degradação ambiental. Este trabalho objetivou avaliar a adequação do uso das terras na Microbacia do Ribeirão João Leite, Goiás, Brasil (entre 16°13´S e 16°39´S, e 48°57´S e 49°11´W, utilizando-se geotecnologias. Por meio do software Spring, foram gerados mapas temáticos, baseados nos fatores determinantes das condições agrícolas das terras (deficiência de fertilidade, água e oxigênio, impedimento à mecanização e susceptibilidade à erosão, para a elaboração dos mapas de aptidão agrícola, das terras da área de estudo, nos manejos B e C. Foi, também, elaborado o mapa de uso e ocupação das terras, o qual foi, posteriormente, submetido a operações de tabulação cruzada com os mapas gerados de aptidão agrícola, obtendo-se a adequação do uso das terras. Os resultados constataram que a maior parte das terras da área estudada apresenta utilização de acordo ou abaixo do seu potencial agrícola, com 71,34% e 66,16%, respectivamente, nos níveis de manejo B e C. Observou-se, ainda, que apenas 1,81% (manejo B e 0,92% (manejo C da área apresentam suas terras com uso inadequado. Estes resultados caracterizam sustentabilidade da utilização agropecuária das terras da Microbacia do Ribeirão João Leite.

    Formation of telomeric repeat-containing RNA (TERRA) foci in highly proliferating mouse cerebellar neuronal progenitors and medulloblastoma.

    Science.gov (United States)

    Deng, Zhong; Wang, Zhuo; Xiang, Chaomei; Molczan, Aliah; Baubet, Valérie; Conejo-Garcia, Jose; Xu, Xiaowei; Lieberman, Paul M; Dahmane, Nadia

    2012-09-15

    Telomeres play crucial roles in the maintenance of genome integrity and control of cellular senescence. Most eukaryotic telomeres can be transcribed to generate a telomeric repeat-containing RNA (TERRA) that persists as a heterogeneous nuclear RNA and can be developmentally regulated. However, the precise function and regulation of TERRA in normal and cancer cell development remains poorly understood. Here, we show that TERRA accumulates in highly proliferating normal and cancer cells, and forms large nuclear foci, which are distinct from previously characterized markers of DNA damage or replication stress. Using a mouse model for medulloblastoma driven by chronic Sonic hedgehog (SHH) signaling, TERRA RNA was detected in tumor, but not adjacent normal cells using both RNA fluorescence in situ hybridization (FISH) and northern blotting. RNA FISH revealed the formation of TERRA foci (TERFs) in the nuclear regions of rapidly proliferating tumor cells. In the normal developing cerebellum, TERRA aggregates could also be detected in highly proliferating zones of progenitor neurons. SHH could enhance TERRA expression in purified granule progenitor cells in vitro, suggesting that proliferation signals contribute to TERRA expression in responsive tissue. TERRA foci did not colocalize with γH2AX foci, promyelocytic leukemia (PML) or Cajal bodies in mouse tumor tissue. We also provide evidence that TERRA is elevated in a variety of human cancers. These findings suggest that elevated TERRA levels reflect a novel early form of telomere regulation during replication stress and cancer cell evolution, and the TERRA RNA aggregates may form a novel nuclear body in highly proliferating mammalian cells.

  7. Chromatin remodeling of human subtelomeres and TERRA promoters upon cellular senescence: commonalities and differences between chromosomes.

    Science.gov (United States)

    Thijssen, Peter E; Tobi, Elmar W; Balog, Judit; Schouten, Suzanne G; Kremer, Dennis; El Bouazzaoui, Fatiha; Henneman, Peter; Putter, Hein; Eline Slagboom, P; Heijmans, Bastiaan T; van der Maarel, Silvère M

    2013-05-01

    Subtelomeres are patchworks of evolutionary conserved sequence blocks and harbor the transcriptional start sites for telomere repeat containing RNAs (TERRA). Recent studies suggest that the interplay between telomeres and subtelomeric chromatin is required for maintaining telomere function. To further characterize chromatin remodeling of subtelomeres in relation to telomere shortening and cellular senescence, we systematically quantified histone modifications and DNA methylation at the subtelomeres of chromosomes 7q and 11q in primary human WI-38 fibroblasts. Upon senescence, both subtelomeres were characterized by a decrease in markers of constitutive heterochromatin, suggesting relative chromatin relaxation. However, we did not find increased levels of markers of euchromatin or derepression of the 7q VIPR2 gene. The repressed state of the subtelomeres was maintained upon senescence, which could be attributed to a rise in levels of facultative heterochromatin markers at both subtelomeres. While senescence-induced subtelomeric chromatin remodeling was similar for both chromosomes, chromatin remodeling at TERRA promoters displayed chromosome-specific patterns. At the 7q TERRA promoter, chromatin structure was co-regulated with the more proximal subtelomere. In contrast, the 11q TERRA promoter, which was previously shown to be bound by CCCTC-binding factor CTCF, displayed lower levels of markers of constitutive heterochromatin that did not change upon senescence, whereas levels of markers of facultative heterochromatin decreased upon senescence. In line with the chromatin state data, transcription of 11q TERRA but not 7q TERRA was detected. Our study provides a detailed description of human subtelomeric chromatin dynamics and shows distinct regulation of the TERRA promoters of 7q and 11q upon cellular senescence.

  8. MOPITT Mechanisms 16 Years In-Orbit Operation on TERRA

    Science.gov (United States)

    Gibson, Andrew S.; Nichitiu, Florian; Caldwell, Dwight

    2016-01-01

    The 16th anniversary of the launch of NASA's Terra Spacecraft was marked on December 18, 2015, with the Measurements of Pollution in the Troposphere (MOPITT) instrument being a successful contributor to the NASA EOS flagship. MOPITT has been enabled by a large suite of mechanisms, allowing the instrument to perform long-duration monitoring of atmospheric carbon monoxide, providing global measurements of this important greenhouse gas for 16 years. Mechanisms have been successfully employed for scanning, cooling of detectors, and to optically modulate the gas path length within the instrument by means of pressure and gas cell length variation. The instrument utilizes these devices to perform correlation spectroscopy, enabling measurements with vertical resolution from the nadir view, and has thereby furthered understanding of source and global transport effects of carbon monoxide. Given the design requirement for a 5.25-year lifetime, the stability and performance of the majority of mechanisms have far surpassed design goals. With 16 continuously operating mechanisms in service on MOPITT, including 12 rotating mechanisms and 4 with linear drive elements, the instrument was an ambitious undertaking. The long life requirements combined with demands for cleanliness and optical stability made for difficult design choices including that of the selection of new lubrication processes. Observations and lessons learned with regards to many aspects of the mechanisms and associated monitoring devices are discussed here. Mechanism behaviors are described, including anomalies, long-term drive current/power, fill pressure, vibration and cold-tip temperature trends. The effectiveness of particular lubrication formulations and the screening method implemented is discussed in relation to continuous rotating mechanisms and stepper motors, which have exceeded 15 billon rotations and 2.5 billion steps respectively. Aspects of gas cell hermeticity, optical cleanliness, heater problems

  9. Toxicity assessment in marine sediment for the Terra Nova environmental effects monitoring program (1997-2010)

    Science.gov (United States)

    Whiteway, Sandra A.; Paine, Michael D.; Wells, Trudy A.; DeBlois, Elisabeth M.; Kilgour, Bruce W.; Tracy, Ellen; Crowley, Roger D.; Williams, Urban P.; Janes, G. Gregory

    2014-12-01

    This paper discusses toxicity test results on sediments from the Terra Nova offshore oil development. The Terra Nova Field is located on the Grand Banks approximately 350 km southeast of Newfoundland (Canada). The amphipod (Rhepoxynius abronius) survival and solid phase luminescent bacteria (Vibrio fischeri, or Microtox) assays were conducted on sediment samples collected from approximately 50 stations per program year around Terra Nova during baseline (1997), prior to drilling, and in 2000, 2001, 2002, 2004, 2006, 2008 and 2010 after drilling began. The frequency of toxic responses in the amphipod toxicity test was low. Of the ten stations that were toxic in environmental effects monitoring (EEM) years, only one (station 30(FE)) was toxic in more than one year and could be directly attributed to Terra Nova project activities. In contrast, 65 (18%) of 364 EEM samples were toxic to Microtox. Microtox toxicity in EEM years was not related to distance from Terra Nova drill centres or concentrations of >C10-C21 hydrocarbons or barium, the primary constituents of the synthetic-based drill muds used at Terra Nova. Of the variables tested, fines and strontium levels showed the strongest (positive) correlations with toxicity. Neither fines nor strontium levels were affected by drill cuttings discharge at Terra Nova, except at station 30(FE) (and that station was not toxic to Microtox). Benthic macro-invertebrate abundance, richness and diversity were greater in toxic than in non-toxic sediments. Therefore, Microtox responses indicating toxicity were associated with positive biological responses in the field. This result may have been an indirect function of the increased abundance of most invertebrate taxa in less sandy sediments with higher gravel content, where fines and strontium levels and, consequently, toxicity to Microtox were high; or chemical substances released by biodegradation of organic matter, where invertebrates are abundant, may be toxic to Microtox. Given

  10. TERRA-Reinforced Association of LSD1 with MRE11 Promotes Processing of Uncapped Telomeres

    Directory of Open Access Journals (Sweden)

    Antonio Porro

    2014-02-01

    Full Text Available Telomeres protect chromosome ends from being recognized as sites of DNA damage. Upon telomere shortening or telomere uncapping induced by loss of telomeric repeat-binding factor 2 (TRF2, telomeres elicit a DNA-damage response leading to cellular senescence. Here, we show that following TRF2 depletion, the levels of the long noncoding RNA TERRA increase and LSD1, which binds TERRA, is recruited to telomeres. At uncapped telomeres, LSD1 associates with MRE11, one of the nucleases implicated in the processing of 3′ telomeric G overhangs, and we show that LSD1 is required for efficient removal of these structures. The LSD1-MRE11 interaction is reinforced in vivo following TERRA upregulation in TRF2-deficient cells and in vitro by TERRA-mimicking RNA oligonucleotides. Furthermore, LSD1 enhances the nuclease activity of MRE11 in vitro. Our data indicate that recruitment of LSD1 to deprotected telomeres requires MRE11 and is promoted by TERRA. LSD1 stimulates MRE11 catalytic activity and nucleolytic processing of uncapped telomeres.

  11. Telomere Length Determines TERRA and R-Loop Regulation through the Cell Cycle.

    Science.gov (United States)

    Graf, Marco; Bonetti, Diego; Lockhart, Arianna; Serhal, Kamar; Kellner, Vanessa; Maicher, André; Jolivet, Pascale; Teixeira, Maria Teresa; Luke, Brian

    2017-06-29

    Maintenance of a minimal telomere length is essential to prevent cellular senescence. When critically short telomeres arise in the absence of telomerase, they can be repaired by homology-directed repair (HDR) to prevent premature senescence onset. It is unclear why specifically the shortest telomeres are targeted for HDR. We demonstrate that the non-coding RNA TERRA accumulates as HDR-promoting RNA-DNA hybrids (R-loops) preferentially at very short telomeres. The increased level of TERRA and R-loops, exclusively at short telomeres, is due to a local defect in RNA degradation by the Rat1 and RNase H2 nucleases, respectively. Consequently, the coordination of TERRA degradation with telomere replication is altered at shortened telomeres. R-loop persistence at short telomeres contributes to activation of the DNA damage response (DDR) and promotes recruitment of the Rad51 recombinase. Thus, the telomere length-dependent regulation of TERRA and TERRA R-loops is a critical determinant of the rate of replicative senescence. Copyright © 2017 Elsevier Inc. All rights reserved.

  12. TERRA-reinforced association of LSD1 with MRE11 promotes processing of uncapped telomeres.

    Science.gov (United States)

    Porro, Antonio; Feuerhahn, Sascha; Lingner, Joachim

    2014-02-27

    Telomeres protect chromosome ends from being recognized as sites of DNA damage. Upon telomere shortening or telomere uncapping induced by loss of telomeric repeat-binding factor 2 (TRF2), telomeres elicit a DNA-damage response leading to cellular senescence. Here, we show that following TRF2 depletion, the levels of the long noncoding RNA TERRA increase and LSD1, which binds TERRA, is recruited to telomeres. At uncapped telomeres, LSD1 associates with MRE11, one of the nucleases implicated in the processing of 3' telomeric G overhangs, and we show that LSD1 is required for efficient removal of these structures. The LSD1-MRE11 interaction is reinforced in vivo following TERRA upregulation in TRF2-deficient cells and in vitro by TERRA-mimicking RNA oligonucleotides. Furthermore, LSD1 enhances the nuclease activity of MRE11 in vitro. Our data indicate that recruitment of LSD1 to deprotected telomeres requires MRE11 and is promoted by TERRA. LSD1 stimulates MRE11 catalytic activity and nucleolytic processing of uncapped telomeres. Copyright © 2014 The Authors. Published by Elsevier Inc. All rights reserved.

  13. Monitoring the On-Orbit Calibration of Terra MODIS Reflective Solar Bands Using Simultaneous Terra MISR Observations

    Science.gov (United States)

    Angal, Amit; Xiong, Xiaoxiong; Wu, Aisheng

    2016-01-01

    On December 18, 2015, the Terra spacecraft completed 16 years of successful operation in space. Terra has five instruments designed to facilitate scientific measurements of the earths land, ocean, and atmosphere. The Moderate Resolution Imaging Spectroradiometer (MODIS) and the Multiangle Imaging Spectroradiometer (MISR) instruments provide information for the temporal studies of the globe. After providing over 16 years of complementary measurements, a synergistic use of the measurements obtained from these sensors is beneficial for various science products. The 20 reflective solar bands (RSBs) of MODIS are calibrated using a combination of solar diffuser and lunar measurements, supplemented by measurements from pseudoinvariant desert sites. MODIS views the on-board calibrators and the earth via a two-sided scan mirror at three spatial resolutions: 250 m using 40 detectors in bands 1 and 2, 500 m using 20 detectors in bands 3 and 4, and 1000 m using 10 detectors in bands 819 and 26. Simultaneous measurements of the earths surface are acquired in a push-broom fashion by MISR at nine view angles spreading out in the forward and backward directions along the flight path. While the swath width for MISR acquisitions is 360 km, MODIS scans a wider swath of 2330 km via its two-sided scan mirror. The reflectance of the MODIS scan mirror has an angle dependence characterized by the response versus scan angle (RVS). Its on-orbit change is derived using the gain from a combination of on-board and earth-view measurements. The on-orbit RVS for MODIS has experienced a significant change, especially for the short-wavelength bands. The on-orbit RVS change for the short-wavelength bands (bands 3, 8, and 9) at nadir is observed to be greater than 10 over the mission lifetime. Due to absence of a scanning mechanism, MISR can serve as an effective tool to evaluate and monitor the on-orbit performance of the MODIS RVS. Furthermore, it can also monitor the detector and scan

  14. Earth Observing System (EOS) Terra Spacecraft 120 Volt Power Subsystem: Requirements, Development and Implementation

    Science.gov (United States)

    Keys, Denney J.

    2000-01-01

    Built by the Lockheed-Martin Corporation, the Earth Observing System (EOS) TERRA spacecraft represents the first orbiting application of a 120 Vdc high voltage spacecraft electrical power system implemented by the National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC). The EOS TERRA spacecraft's launch provided a major contribution to the NASA Mission to Planet Earth program while incorporating many state of the art electrical power system technologies to achieve its mission goals. The EOS TERRA spacecraft was designed around five state-of-the-art scientific instrument packages designed to monitor key parameters associated with the earth's climate. The development focus of the TERRA electrical power system (EPS) resulted from a need for high power distribution to the EOS TERRA spacecraft subsystems and instruments and minimizing mass and parasitic losses. Also important as a design goal of the EPS was maintaining tight regulation on voltage and achieving low conducted bus noise characteristics. This paper outlines the major requirements for the EPS as well as the resulting hardware implementation approach adopted to meet the demands of the EOS TERRA low earth orbit mission. The selected orbit, based on scientific needs, to achieve the EOS TERRA mission goals is a sun-synchronous circular 98.2degree inclination Low Earth Orbit (LEO) with a near circular average altitude of 705 kilometers. The nominal spacecraft orbit is approximately 99 minutes with an average eclipse period of about 34 minutes. The scientific goal of the selected orbit is to maintain a repeated 10:30 a.m. +/- 15 minute descending equatorial crossing which provides a fairly clear view of the earth's surface and relatively low cloud interference for the instrument observation measurements. The major EOS TERRA EPS design requirements are single fault tolerant, average orbit power delivery of 2, 530 watts with a defined minimum lifetime of five years (EOL). To meet

  15. Fifteen Years of ASTER Data on NASA's Terra Platform

    Science.gov (United States)

    Abrams, M.; Tsu, H.

    2014-12-01

    The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is one of five instruments operating on NASA's Terra platform. Launched in 1999, ASTER has been acquiring data for 15 years. ASTER is a joint project between Japan's Ministry of Economy, Trade and Industry; and US NASA. Data processing and distribution are done by both organizations; a joint science team helps to define mission priorities. ASTER acquires ~550 images per day, with a 60 km swath width. A daytime acquisition is three visible bands and a backward-looking stereo band with 15 m resolution, six SWIR bands with 30 m resolution, and 5 TIR bands with 90 m resolution. Nighttime TIR-only data are routinely collected. The stereo capability has allowed the ASTER project to produce a global Digital Elevation Model (GDEM) data set, covering the earth's land surfaces from 83 degrees north to 83 degrees south, with 30 m data postings. This is the only (near-) global DEM available to all users at no charge; to date, over 28 million 1-by-1 degree DEM tiles have been distributed. As a general-purpose imaging instrument, ASTER-acquired data are used in numerous scientific disciplines, including: land use/land cover, urban monitoring, urban heat island studies, wetlands studies, agriculture monitoring, forestry, etc. Of particular emphasis has been the acquisition and analysis of data for natural hazard and disaster applications. We have been systematically acquiring images for 15,000 valley glaciers through the USGS Global Land Ice Monitoring from Space Project. The recently published Randolph Glacier Inventory, and the GLIMS book, both relied heavily on ASTER data as the basis for glaciological and climatological studies. The ASTER Volcano Archive is a unique on-line archive of thousands of daytime and nighttime ASTER images of ~1500 active glaciers, along with a growing archive of Landsat images. ASTER was scheduled to target active volcanoes at least 4 times per year, and more frequently for

  16. Terra e Arte Project: Soils connecting Art and Education

    Science.gov (United States)

    Muggler, Cristine Carole; Rozenberg, Bianca; de Cássia Francisco, Talita; Gramacho de Oliveira, Elisa

    2015-04-01

    The "Terra e Arte" project was designed to combine science and art by approaching soil contents in basic education schools in Viçosa, Minas Gerais, Brazil. The project was developed to awake, sensitize and create awareness about soils and their importance to life and environment within school communities. It was proposed and realized by the Earth Sciences Museum Alexis Dorofeef (MCTAD) of the Federal University of Viçosa (UFV), as part of the celebrations of its 20th anniversary. Since all the schools of the town visit the museum at least once a year and most of them have received and carried out pedagogic projects on soil themes in the last 20 years, it was proposed to them to develop a soil subject with any of their groups and combine it with painting using soil materials. Each group interested in joining the project received a basic set of material to produce soil paints. They were expected to develop a soil theme and its contents for a few weeks and to finalize it with a figurative and textual collective creation that synthetized their learning. 16 of the 24 visited schools joined the project and realized it for an average of two months. During this time, the school groups visited the museum and/or borrowed the itinerant exposition on soils from the museum to work with in in the school community. At the end of the projects, the productions were presented at the Knowledge Market (Feira do Conhecimento) that happens every year in the central square of the town, as part of the National Week of Science and Technology. At the event, 58 works were presented by 14 schools, involving directly 700 pupils and their teachers. They approached themes from soil formation and properties to agroecology and urban occupation and impacts on the soils. 30 of the works were selected for a commemorative exposition and 12 were chosen for a table calendar 2014. The movement created around the project mobilized many people and had strong impact on the school communities, especially

  17. Modelling sea ice formation in the Terra Nova Bay polynya

    Science.gov (United States)

    Sansiviero, M.; Morales Maqueda, M. Á.; Fusco, G.; Aulicino, G.; Flocco, D.; Budillon, G.

    2017-02-01

    Antarctic sea ice is constantly exported from the shore by strong near surface winds that open leads and large polynyas in the pack ice. The latter, known as wind-driven polynyas, are responsible for significant water mass modification due to the high salt flux into the ocean associated with enhanced ice growth. In this article, we focus on the wind-driven Terra Nova Bay (TNB) polynya, in the western Ross Sea. Brine rejected during sea ice formation processes that occur in the TNB polynya densifies the water column leading to the formation of the most characteristic water mass of the Ross Sea, the High Salinity Shelf Water (HSSW). This water mass, in turn, takes part in the formation of Antarctic Bottom Water (AABW), the densest water mass of the world ocean, which plays a major role in the global meridional overturning circulation, thus affecting the global climate system. A simple coupled sea ice-ocean model has been developed to simulate the seasonal cycle of sea ice formation and export within a polynya. The sea ice model accounts for both thermal and mechanical ice processes. The oceanic circulation is described by a one-and-a-half layer, reduced gravity model. The domain resolution is 1 km × 1 km, which is sufficient to represent the salient features of the coastline geometry, notably the Drygalski Ice Tongue. The model is forced by a combination of Era Interim reanalysis and in-situ data from automatic weather stations, and also by a climatological oceanic dataset developed from in situ hydrographic observations. The sensitivity of the polynya to the atmospheric forcing is well reproduced by the model when atmospheric in situ measurements are combined with reanalysis data. Merging the two datasets allows us to capture in detail the strength and the spatial distribution of the katabatic winds that often drive the opening of the polynya. The model resolves fairly accurately the sea ice drift and sea ice production rates in the TNB polynya, leading to

  18. TERRA: a computer code for simulating the transport of environmentally released radionuclides through agriculture

    Energy Technology Data Exchange (ETDEWEB)

    Baes, C.F. III; Sharp, R.D.; Sjoreen, A.L.; Hermann, O.W.

    1984-11-01

    TERRA is a computer code which calculates concentrations of radionuclides and ingrowing daughters in surface and root-zone soil, produce and feed, beef, and milk from a given deposition rate at any location in the conterminous United States. The code is fully integrated with seven other computer codes which together comprise a Computerized Radiological Risk Investigation System, CRRIS. Output from either the long range (> 100 km) atmospheric dispersion code RETADD-II or the short range (<80 km) atmospheric dispersion code ANEMOS, in the form of radionuclide air concentrations and ground deposition rates by downwind location, serves as input to TERRA. User-defined deposition rates and air concentrations may also be provided as input to TERRA through use of the PRIMUS computer code. The environmental concentrations of radionuclides predicted by TERRA serve as input to the ANDROS computer code which calculates population and individual intakes, exposures, doses, and risks. TERRA incorporates models to calculate uptake from soil and atmospheric deposition on four groups of produce for human consumption and four groups of livestock feeds. During the environmental transport simulation, intermediate calculations of interception fraction for leafy vegetables, produce directly exposed to atmospherically depositing material, pasture, hay, and silage are made based on location-specific estimates of standing crop biomass. Pasture productivity is estimated by a model which considers the number and types of cattle and sheep, pasture area, and annual production of other forages (hay and silage) at a given location. Calculations are made of the fraction of grain imported from outside the assessment area. TERRA output includes the above calculations and estimated radionuclide concentrations in plant produce, milk, and a beef composite by location.

  19. TerraFERMA: The Transparent Finite Element Rapid Model Assembler for multiphysics problems in Earth sciences

    Science.gov (United States)

    Wilson, Cian R.; Spiegelman, Marc; van Keken, Peter E.

    2017-02-01

    We introduce and describe a new software infrastructure TerraFERMA, the Transparent Finite Element Rapid Model Assembler, for the rapid and reproducible description and solution of coupled multiphysics problems. The design of TerraFERMA is driven by two computational needs in Earth sciences. The first is the need for increased flexibility in both problem description and solution strategies for coupled problems where small changes in model assumptions can lead to dramatic changes in physical behavior. The second is the need for software and models that are more transparent so that results can be verified, reproduced, and modified in a manner such that the best ideas in computation and Earth science can be more easily shared and reused. TerraFERMA leverages three advanced open-source libraries for scientific computation that provide high-level problem description (FEniCS), composable solvers for coupled multiphysics problems (PETSc), and an options handling system (SPuD) that allows the hierarchical management of all model options. TerraFERMA integrates these libraries into an interface that organizes the scientific and computational choices required in a model into a single options file from which a custom compiled application is generated and run. Because all models share the same infrastructure, models become more reusable and reproducible, while still permitting the individual researcher considerable latitude in model construction. TerraFERMA solves partial differential equations using the finite element method. It is particularly well suited for nonlinear problems with complex coupling between components. TerraFERMA is open-source and available at http://terraferma.github.io, which includes links to documentation and example input files.

  1. TERRA, hnRNP A1, and DNA-PKcs Interactions at Human Telomeres.

    Science.gov (United States)

    Le, Phuong N; Maranon, David G; Altina, Noelia H; Battaglia, Christine L R; Bailey, Susan M

    2013-01-01

    Maintenance of telomeres, repetitive elements at eukaryotic chromosomal termini, and the end-capping structure and function they provide, are imperative for preserving genome integrity and stability. The discovery that telomeres are transcribed into telomere repeat containing RNA (TERRA) has revolutionized our view of this repetitive, rather unappreciated region of the genome. We have previously shown that the non-homologous end-joining, shelterin associated DNA dependent protein kinase catalytic subunit (DNA-PKcs) participates in mammalian telomeric end-capping, exclusively at telomeres created by leading-strand synthesis. Here, we explore potential roles of DNA-PKcs and its phosphorylation target heterogeneous nuclear ribonucleoprotein A1 (hnRNP A1) in the localization of TERRA at human telomeres. Evaluation of co-localized foci utilizing RNA-FISH and three-dimensional (3D) reconstruction strategies provided evidence that both inhibition of DNA-PKcs kinase activity and siRNA depletion of hnRNP A1 result in accumulation of TERRA at individual telomeres; depletion of hnRNP A1 also resulted in increased frequencies of fragile telomeres. These observations are consistent with previous demonstrations that decreased levels of the nonsense RNA-mediated decay factors SMG1 and UPF1 increase TERRA at telomeres and interfere with replication of leading-strand telomeres. We propose that hTR mediated stimulation of DNA-PKcs and subsequent phosphorylation of hnRNP A1 influences the cell cycle dependent distribution of TERRA at telomeres by contributing to the removal of TERRA from telomeres, an action important for progression of S-phase, and thereby facilitating efficient telomere replication and end-capping.

  2. Cross-Calibration of the Oceansat-2 Ocean Colour Monitor (OCM) with Terra and Aqua MODIS

    Science.gov (United States)

    Angal, Amit; Brinkmann, Jake; Kumar, A. Senthil; Xiong, Xiaoxiong

    2016-01-01

    The Ocean Colour Monitor (OCM) sensor on-board the Oceansat-2 spacecraft has been operational since its launch in September, 2009. The Oceansat 2 OCM primary design goal is to provide continuity to Oceansat-1 OCM to obtain information regarding various ocean-colour variables. OCM acquires Earth scene measurements in eight multi-spectral bands in the range from 402 to 885 nm. The MODIS sensor on the Terra and Aqua spacecraft has been successfully operating for over a decade collecting measurements of the earth's land, ocean surface and atmosphere. The MODIS spectral bands, designed for land and ocean applications, cover the spectral range from 412 to 869 nm. This study focuses on comparing the radiometric calibration stability of OCM using near-simultaneous TOA measurements with Terra and Aqua MODIS acquired over the Libya 4 target. Same-day scene-pairs from all three sensors (OCM, Terra and Aqua MODIS) between August, 2014 and September, 2015 were chosen for this analysis. On a given day, the OCM overpass is approximately an hour after the Terra overpass and an hour before the Aqua overpass. Due to the orbital differences between Terra and Aqua, MODIS images the Libya 4 site at different scan-angles on a given day. Some of the high-gain ocean bands for MODIS tend to saturate while viewing the bright Libya 4 target, but bands 8-10 (412 nm - 486 nm) provide an unsaturated response and are used for comparison with the spectrally similar OCM bands. All the standard corrections such as bidirectional reflectance factor (BRDF), relative spectral response mismatch, and impact for atmospheric water-vapor are applied to obtain the reflectance differences between OCM and the two MODIS instruments. Furthermore, OCM is used as a transfer radiometer to obtain the calibration differences between Terra and Aqua MODIS reflective solar bands.

  3. 75 FR 1052 - Terra-Gen Dixie Valley, LLC; TGP Dixie Development Company, LLC; New York Canyon, LLC; Notice of...

    Science.gov (United States)

    2010-01-08

    ... [Federal Register Volume 75, Number 5 (Friday, January 8, 2010)] [Notices] [Page 1052] [FR Doc No: 2010-62] DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Docket No. EL10-29-000] Terra-Gen... 30, 2009. Take notice that on December 24, 2009, Terra-Gen Dixie Valley, LLC, TGP Dixie Development...

  4. Los cócs: una seña de identidad de la Terra Alta

    OpenAIRE

    Maria Del Loreto Meix

    2004-01-01

    Este artículo trata sobre la repostería tradicional de la comarca de la Terra Alta (Cataluña) vinculada a las fiestas, especialmente sobre las pastas que se suelen hacer en dicha comarca. En esta zona las pastas se llaman cócs, una palabra que está presente tanto en la Terra Alta como en las comarcas vecinas de la Ribera d'Ebre o el Priorat. Junto con las pastas se sirve el vino rancio, la mistela o el vino dulce, que también son productos de e...

  5. Argamassas para construções em terra crua. Patologias associadas e formas de as minorar

    OpenAIRE

    Faria, Paulina

    2003-01-01

    Encontro “A Terra na Arquitectura”, Sines, 2003 Apresentam-se de forma genérica as principais patologias associadas às construções de terra crua, nomeadamente às relativas à erosão, à absorção de água e a condensações de vapor de água. Ressaltam-se os problemas relativos à acção dos sais. Relembram-se as exigências a cumprir pelos revestimentos de paredes, as características que estes devem possuir e os tipos de argamassas de revestimento aplicados correntemente. Apresentam-se alguma...

  6. Water Indicators in Sirenum Terra and Around the Argyre Impact Basin, Mars

    Science.gov (United States)

    Stern, J. G.; Frey, H. V.

    2004-01-01

    This study examines the relationships between three temporally distinct indicators of water on Mars: ancient craters with fluidized ejecta, relatively more recent gullies inside those craters, and current abundance of near surface hydrogen around those craters. We find an association between gully occurrence and large-scale geologic features; analysis indicates unique depth/diameter ratios for gullied craters in Sirenum Terra. Numerical comparisons of fluidized and non-fluidized, gullied and non-gullied craters suggest that the Argyre region could have had a near-surface water table that receded before recent times, while Sirenum Terra may have had an ancient water table that persists to this day.

  7. La terra e l’εὕρησις del fuoco nella Grecia Antica

    Directory of Open Access Journals (Sweden)

    Sabrina Colabella

    2016-12-01

    Full Text Available L’ εὕρησις del fuoco nell’Antica Grecia è generalmente abbinata al mito di Prometeo. Ma nelle fonti antiche sono presenti numerose tracce di una narrazione mitica secondo cui l’origine del fuoco era da ricondurre anche a Gaia e alla terra. Tale narrazione mitica sembra presentare una stretta connessione con dati ed esperienze appartenenti al vissuto dell’uomo greco, per il quale Gaia / la terra risulterebbe connessa a funzioni ampie e fondamentali.

  8. LIPS and linear correlation analysis applied to the classification of Roman pottery Terra Sigillata

    Science.gov (United States)

    López, A. J.; Nicolás, G.; Mateo, M. P.; Ramil, A.; Piñón, V.; Yáñez, A.

    2006-06-01

    Archaeological ceramics Terra Sigillata manufactured in different production centres have been studied by laser-induced plasma spectroscopy (LIPS). The aim of this work was to establish a procedure for the rapid classification of these archaeological ceramics in function of their provenance through combination of LIPS and statistical methodologies. Representative emission spectra of the Hispanic, Gaulish and African groups of pottery were selected as references. The use of linear correlation allowed one to cluster the samples by quantitative comparison of LIP spectra, leading to a reliable assignment of Terra Sigillata pieces to origin centres.

  9. Feocromocitoma: uma causa rara de hipertensão arterial na infância Pheochromocytoma: a rare cause of hypertension in childhood

    Directory of Open Access Journals (Sweden)

    Flávia Carolina D. Georgetti

    2007-09-01

    Full Text Available OBJETIVO: Relatar o caso de um adolescente com feocromocitoma, uma causa rara de hipertensão arterial na infância. DESCRIÇÃO: Adolescente internado em unidade de terapia intensiva infantil em decorrência de emergência hipertensiva, conseqüente à presença de feocromocitoma em adrenal esquerda, diagnosticado por meio de tomografia computadorizada do abdome e pela dosagem de adrenalina e noradrenalina urinárias. O paciente foi submetido à adrenalectomia esquerda, após o uso de alfa-bloqueador para controle do quadro hipertensivo. O anatomopatológico confirmou o diagnóstico do tumor. No pós-operatório, o paciente permaneceu estável, possibilitando a suspensão dos anti-hipertensivos. COMENTÁRIOS: Os feocromocitomas são tumores capazes de produzir catecolaminas, especialmente adrenalina e/ou noradrenalina. Cerca de 85 a 95% dos tumores são únicos, benignos e encontrados na medula adrenal. O feocromocitoma é um tumor de incidência rara e apenas 10 a 20% ocorrem na infância, representando uma causa rara de hipertensão arterial. Esta última é um sinal freqüente na maioria das crianças (80%, podendo ser acompanhada por cefaléia e sudorese. A encefalopatia hipertensiva consiste em uma forma de apresentação excepcional da doença. O diagnóstico pode ser realizado, na maioria dos casos, pela tomografia de abdome e pela dosagem das catecolaminas e seus metabólitos produzidos pelo tumor. O tratamento de escolha consiste na ressecção completa do tumor após o preparo farmacológico do paciente com o uso de alfa-bloqueador. No pós-operatório, a maioria dos pacientes evolui com controle do quadro de hipertensão arterial.OBJECTIVE: Report an adolescent with pheochromocytoma, a rare cause of hypertension in childhood. CASE DESCRIPTION: Adolescent admitted to the pediatric intensive care unit due to hypertension, secondary to the presence of pheochromocytoma on the left adrenal. Diagnosis of the pheochromocytoma was made by

  10. ArchTerra : Extending the European archaeology Web over Bulgaria, Romania and Poland

    NARCIS (Netherlands)

    van Leusen, M; Prinke, A; Stancic, Z; Veljanovski, T

    2001-01-01

    From the beginning of 1999 until the end of 2000, the ArchTerra(1) project (an International co-operation Project under the EU Copernicus programme) has been active in the creation of an Internet infrastructure and content for Central European archaeology. This paper provides a brief overview of its

  11. PREÇO DA TERRA EM GOIÁS: PRESSUPOSTOS E MODELOS

    Directory of Open Access Journals (Sweden)

    Nilson Clementino Ferreira

    2007-06-01

    Full Text Available Um tema tradicionalmente abordado pela economia refere-se aos critérios para definição do preço de terrasagrícolas. No caso específico de Goiás, a discussão sobreo preço da terra assume particular importância, umavez que é um dos fatores responsáveis pela expansãoda Fronteira Agrícola, iniciada em meados da década de1970. Tendo por base um modelo teórico-metodológicoque explica a formação do preço da terra agrícola emGoiás, este trabalho analisa, a partir de métodos de Geoestatísticaaplicados aos vários tipos de ocupação, ospadrões de distribuição espacial do preço da terra. Estaespacialização indicou elevada participação da variável“Localização” na definição do preço da terra, particularmenteconsiderando-se a distância em relação aosprincipais mercados consumidores (ex. Goiânia e agroindustriais(ex. Rio Verde do Estado.

  12. A Paradigm for Operant Conditioning in Blow Flies ("Phormia Terrae Novae" Robineau-Desvoidy, 1830)

    Science.gov (United States)

    Sokolowski, Michel B. C.; Disma, Gerald; Abramson, Charles I.

    2010-01-01

    An operant conditioning situation for the blow fly ("Protophormia terrae novae") is described. Individual flies are trained to enter and reenter a hole as the operant response. Only a few sessions of contingent reinforcement are required to increase response rates. When the response is no longer followed by food, the rate of entering the hole…

  13. Telomeric repeat-containing RNA (TERRA) and telomerase are components of telomeres during mammalian gametogenesis.

    Science.gov (United States)

    Reig-Viader, Rita; Vila-Cejudo, Marta; Vitelli, Valerio; Buscà, Rafael; Sabaté, Montserrat; Giulotto, Elena; Caldés, Montserrat Garcia; Ruiz-Herrera, Aurora

    2014-05-01

    Telomeres are ribonucleoprotein structures at the end of chromosomes composed of telomeric DNA, specific-binding proteins, and noncoding RNA (TERRA). Despite their importance in preventing chromosome instability, little is known about the cross talk between these three elements during the formation of the germ line. Here, we provide evidence that both TERRA and the telomerase enzymatic subunit (TERT) are components of telomeres in mammalian germ cells. We found that TERRA colocalizes with telomeres during mammalian meiosis and that its expression progressively increases during spermatogenesis until the beginning of spermiogenesis. While both TERRA levels and distribution would be regulated in a gender-specific manner, telomere-TERT colocalization appears to be regulated based on species-specific characteristics of the telomeric structure. Moreover, we found that TERT localization at telomeres is maintained throughout spermatogenesis as a structural component without affecting telomere elongation. Our results represent the first evidence of colocalization between telomerase and telomeres during mammalian gametogenesis. © 2014 by the Society for the Study of Reproduction, Inc.

  14. TERRA-KLEEN RESPONSE GROUP, INC. SOLVENT EXTRACTION TECHNOLOGY: INNOVATIVE TECHNOLOGY EVALUATION REPORT

    Science.gov (United States)

    This report summarizes the results of a field demonstration conducted under the SITE program. The technology which was demonstrated was a solvent extraction technology developed by Terra-Kleen Response Group. Inc. to remove organic contaminants from soil. The technology employs...

  15. FIELD EVALUATION OF TERRA THERM IN SITU THERMAL DESTRUCTION (ISTD) TREATMENT OF HEXACHLOROCYCLOPENTADIENE

    Science.gov (United States)

    This report summarizes the U.S. Environmental Protection Agency (EPA) Superfund Innovative Technology Evaluation (SITE) Program evaluation of the In Situ Thermal Destruction (ISTD) technology, developed by others, was refined by TerraTherm, Inc. The demonstration was designed to ...

  16. Terra Pretas: Charcoal Amendments Influence on Relict Soils and Modern Agriculture

    Science.gov (United States)

    Ricigliano, Kristin

    2011-01-01

    Most soils found in the Amazon region are characterized by highly weathered profiles that are incapable of longterm agricultural production. However, small patches of highly fertile relict soil referred to as Terra Pretas, are also found in the Amazon region, and have maintained their integrity for thousands of years. These soils were…

  17. Terra Firma-Forme Dermatosis in Singaporean Patients: The "Alcohol Wipe" Sign.

    Science.gov (United States)

    Oh, Choon Chiat; Oon, Hazel H; Ng, See Ket; Tee, Shang Ian; Jhingan, Anjali; Chong, Wei-Sheng

    2016-01-01

    The term terra firma-forme dermatosis arises from the Latin phrase terra firma , meaning dry land (dirt), thus implying dirt-like dermatosis. The authors highlight five cases of patients with terra firma-forme dermatosis presenting to our dermatology center between 2012 and 2013. All patients presented to the dermatologist for persistent reticulated brown patches on the skin. These patients ranged in age from 6 to 22 years. All patients had tried various cleansing soaps and agents but were unable to remove the patches. The condition was cosmetically unacceptable to the patients and parents. Clinically, these patients had reticulated brown patches. Rubbing 70% isopropyl alcohol wipes on the affected areas demonstrated clearance of the brown pigmented patches in all cases. The diagnosis of terra firma-forme dermatosis (TFFD) was confirmed by forceful rubbing with a gauze pad immersed in 70% isopropyl alcohol or ethyl alcohol. Patients should be reassured about the benign nature of TFFD and educated about the cleaning procedure. Recognition of this condition can assist physicians in making a diagnosis and therapy with a simple alcohol wipe, preventing further unnecessary tests for patients.

  18. Ice-bearing deposits in the southern mid-latitude regions of Terra Cimmeria, Mars

    Science.gov (United States)

    Adeli, S.; Hauber, E.; Jaumann, R.; Michael, G.; Fawdon, P.

    2017-09-01

    We report here the presence of a newly observed well-preserved glacial-like and ice-bearing deposit, named Valley Fill Deposit (VFD), on the surface of Terra Cimmeria, located in the southern mid-latitude regions of Mars.

  19. Adjustments to the MODIS Terra Radiometric Calibration and Polarization Sensitivity in the 2010 Reprocessing

    Science.gov (United States)

    Meister, Gerhard; Franz, Bryan A.

    2011-01-01

    The Moderate-Resolution Imaging Spectroradiometer (MODIS) on NASA s Earth Observing System (EOS) satellite Terra provides global coverage of top-of-atmosphere (TOA) radiances that have been successfully used for terrestrial and atmospheric research. The MODIS Terra ocean color products, however, have been compromised by an inadequate radiometric calibration at the short wavelengths. The Ocean Biology Processing Group (OBPG) at NASA has derived radiometric corrections using ocean color products from the SeaWiFS sensor as truth fields. In the R2010.0 reprocessing, these corrections have been applied to the whole mission life span of 10 years. This paper presents the corrections to the radiometric gains and to the instrument polarization sensitivity, demonstrates the improvement to the Terra ocean color products, and discusses issues that need further investigation. Although the global averages of MODIS Terra ocean color products are now in excellent agreement with those of SeaWiFS and MODIS Aqua, and image quality has been significantly improved, the large corrections applied to the radiometric calibration and polarization sensitivity require additional caution when using the data.

  20. Traceability of PDO Olive Oil “Terra di Bari” Using High Resolution Melting

    Directory of Open Access Journals (Sweden)

    Cinzia Montemurro

    2015-01-01

    Full Text Available The aim of the research was to verify the applicability of microsatellite (SSR markers in High Resolution Melting (HRM analysis for the identification of the olive cultivars used in the “Terra di Bari” PDO extra virgin olive oil. A panel of nine cultivars, widespread in Apulia region, was tested with seventeen SSR primer pairs and the PCR products were at first analysed with a Genetic Analyzer automatic sequencer. An identification key was obtained for the nine cultivars, which showed an unambiguous discrimination among the varieties constituting the “Terra di Bari” PDO extra virgin olive oil: Cima di Bitonto, Coratina, and Ogliarola. Subsequently, an SSR based method was set up with the DCA18 marker, coupled with HRM analysis for the distinction of the Terra di Bari olive oil from non-Terra di Bari olive oil using different mixtures. Thus, this analysis enabled the distinction and identification of the PDO mixtures. Hence, this assay provided a flexible, cost-effective, and closed-tube microsatellite genotyping method, well suited to varietal identification and authentication analysis in olive oil.

  1. A Chinese patient with peritoneal dialysis-related peritonitis caused by Gordonia terrae: a case report.

    Science.gov (United States)

    Hou, Chenrui; Yang, Yun; Li, Ziyang

    2017-02-28

    Gordonia terrae is a rare cause of clinical infections, with only 23 reported cases. We report the first case of peritoneal dialysis-related peritonitis caused by Gordonia terrae in mainland China. A 52-year-old man developed peritoneal dialysis-related peritonitis and received preliminary antibiotic treatment. After claiming that his symptoms had been resolved, the patient insisted on being discharged (despite our recommendations) and did not receive continued treatment after leaving the hospital. A telephone follow-up with the patient's relatives revealed that the patient died 3 months later. Routine testing did not identify the bacterial strain responsible for the infection, although matrix-assisted laser desorption/ionization time-of-flight mass spectrometry identified the strain as Gordonia rubropertincta. However, a 16S rRNA sequence analysis using an isolate from the peritoneal fluid culture revealed that the responsible strain was actually Gordonia terrae. Similar to this case, all previously reported cases have involved a delayed diagnosis and initial treatment failure, and the definitive diagnosis required a 16S rRNA sequence analysis. Changes from an inappropriate antibiotic therapy to an appropriate one have relied on microbiological testing and were performed 7-32 days after the initial treatment. The findings from our case and the previously reported cases indicate that peritoneal dialysis-related peritonitis caused by Gordonia terrae can be difficult to identify and treat. It may be especially challenging to diagnose these cases in countries with limited diagnostic resources.

  2. The role of loamy sediment ( terra rossa) in the context of steady state karst surface lowering

    Science.gov (United States)

    Šušteršič, France; Rejšek, Klement; Mišič, Miha; Eichler, František

    2009-05-01

    Reddish, loamy material ( terra rossa), found on many karstified surfaces, has long been accepted as a characteristic karst feature. Two basic views of terra rossa formation were distinguished, related to either a residual or a detrital origin. More recently it has been suggested that it could derive from isovolumetric reactions between the parent carbonate rock and airborne material. This paper reviews possible sources of terra rossa, explores its behaviour on the karst surface from the karst geomorphology viewpoint, and considers whether its existence is better explained in terms of a closed or open karst geomorphic system. Two approximately west-east traverses were laid out across Slovenia and the Czech Republic, comprising nine sample locations in each country previously known to be characterized by terra rossa. General geomorphic/speleomorphic conditions were estimated, and loamy material and parent rock samples were collected. Insoluble residues extracted from the rock were processed in the same ways as the loamy material. Basic geochemical and mineralogical investigations were run. The data obtained were processed statistically. Results show that statistical relationships between the adjacent rock insoluble residues and adjacent terra rossa bodies exist only at sampling sites recognised as "vertical". Most such sites are cutters, which are "karren-like grooves formed beneath the soil, more commonly referred to as subsoil karren" (US Environmental Protection Agency, 2002. A Lexicon of Cave and Karst Terminology. Field, M.S. (Ed.). pdf>, p.53). Possible sources of terra rossa material as well as the possibilities of material accumulating on the karst surface are discussed in detail, with special emphasis upon cutters. Theoretical considerations indicate that cutters are the only features that can collect sufficient insoluble residue to be detectable after a period of evolution within a surface that is lowering under steady state conditions. All other

  3. Retocolite ulcerativa e artrite reumatoide: uma rara associação - relato de caso Ulcerative colitis and rheumatoid arthritis: a rare association - case report

    Directory of Open Access Journals (Sweden)

    Vitor Alves Cruz

    2012-08-01

    Full Text Available A retocolite ulcerativa é uma desordem autoimune de etiologia desconhecida. Embora o intestino grosso represente o principal foco de autoimunidade, trata-se, na verdade, de uma doença sistêmica com inúmeras manifestações extraintestinais, inclusive articulares. A associação frequente entre diversas doenças autoimunes em um mesmo paciente é descrita na literatura. No entanto, é rara a coexistência entre retocolite ulcerativa e artrite reumatoide. Os autores relatam um caso de retocolite ulcerativa associada à artrite reumatoide em que a colite precedeu em 12 anos o aparecimento da artropatia inflamatória.Ulcerative colitis is an autoimmune disorder of unknown etiology. Although the large intestine is the major focus of autoimmunity, resulting in chronic diarrhea, that is actually a systemic disease, with numerous extraintestinal manifestations, such as articular involvement. The frequent association of a number of autoimmune diseases in the same patient has been described. However, the coexistence of ulcerative colitis and rheumatoid arthritis is rare. The authors report a case of ulcerative colitis associated with rheumatoid arthritis, in which colitis occurred 12 years before the onset of inflammatory arthropathy.

  4. Pioderma granulomatoso superficial: relato de caso de variante rara do pioderma gangrenoso Superficial granulomatous pyoderma: report of a case of an uncommon variant of pyoderma gangrenosum

    Directory of Open Access Journals (Sweden)

    Alceu Luiz Camargo Villela Berbert

    2009-07-01

    Full Text Available O pioderma gangrenoso é doença cutânea inflamatória rara, idiopática. Afeta principalmente adultos; apenas cerca de 4% dos casos são diagnosticados em crianças e adolescentes. Existem quatro formas clínicas de pioderma gangrenoso: ulcerativa, pustular, bolhosa e vegetante (pioderma granulomatoso superficial. O pioderma granulomatoso superficial é considerado a forma mais benigna e incomum da doença. Em pacientes submetidos a manipulação cirúrgica, uma eventual manifestação do pioderma gangrenoso ocorre nos locais de intervenção. Relata-se o caso de criança de cinco anos de idade, vítima de queimadura, que apresentou pioderma granulomatoso superficial sobre áreas doadoras de enxertos.Pyoderma gangrenosum is a rare idiopathic skin disease. It affects mainly adults, and only 4% of the cases are diagnosed on children and adolescents. There are four clinical forms of pyoderma gangrenosum: ulcerative, pustular, bullous, and vegetative (superficial granulomatous pyoderma. Superficial granulomatous pyoderma is considered the most benign and uncommon form of the disease. Patients who have undergone surgical procedures may occasionally present pyoderma gangrenosum manifestations on the surgical site. A case of a five-year-old child, victim of burn, who presented superficial granulomatous pyoderma on the skin graft donor sites is reported.

  5. Distribución de tierras raras en soluciones y coloides de un sistema natural de aguas ácidas (Arroyo del Val, Zaragoza

    Directory of Open Access Journals (Sweden)

    López Julián, P. L.

    1993-04-01

    presentan los primeros resultados obtenidos sobre las concentraciones de tierras raras (REE de estas aguas ácidas (en muestras filtradas a través de mallas de 0,1 I-tm y en los coloides asociados. Las pautas de tierras raras (normalizadas frente a NASC de las aguas ácidas analizadas presentan globalmente un enriquecimiento relativo de las tierras taras pesadas (HREE respecto a las ligeras (LREE, con relaciones Lun/Lan ≈ 2. No obstante, lo más llamativo de estas pautas es el considerable enriquecimiento en las tierras raras intermedias (IREE representadas por Eu, Gd y Tb. Ello provoca que, en detalle, las pautas obtenidas para estas aguas puedan caracterizarse por un enriquecimiento en las tierras raras más pesadas desde La a Gd y por un empobrecimiento, también respecto a las más pesadas, entre Gd y Lu. Los contenidos de REE de los geles analizados son considerablemente superiores a los determinados en las aguas, presentando enriquecimientos de hasta tres y cuatro órdenes de magnitud. Las pautas de REE obtenidas para estos geles, tomados en distintos puntos del curso del Arroyo del Val, son considerablemente diferentes. La del coloide muestreado en el mismo punto que las aguas analizadas es similar a la de las soluciones, con una marcada convexidad para los IREE; la del otro gel, tomado aguas abajo respecto al anterior, presenta un perfil mucho más plano aunque todavía ligeramente convexo para los IREE. Aparentemente, el proceso de floculación coloidal observado en la primera confluencia del Arroyo del Val con un afluente de aguas neutras provoca una considerable disminución de las REE transportadas por las aguas ácidas (hasta un SO %. Yen ese punto, el coloide floculado presenta un enriquecimiento relativo en HREE respecto al observado en las aguas antes y en el punto de floculación.

  6. A história e o acervo das obras raras da Biblioteca de Manguinhos The history of Biblioteca de Manguinhos and its rare collections

    Directory of Open Access Journals (Sweden)

    Maria Élide Bortoletto

    2002-04-01

    Full Text Available O artigo descreve a formação do acervo de obras raras da Biblioteca de Manguinhos, da Fundação Oswaldo Cruz. São obras que se estendem dos séculos XVII ao XX, distribuídas entre livros, coleções de periódicos, folhetos, teses, que contemplam valiosos trabalhos na área da história das ciências biológicas e da saúde. Descreve também a riqueza ornamental e decorativa do ambiente e do mobiliário preservados da biblioteca. Resgata a trajetória de 100 anos da Biblioteca de Manguinhos, intimamente associada à história da Fundação Oswaldo Cruz.This article narrates the creation of Fundação Oswaldo Cruz Biblioteca de Manguinhos (Manguinhos Library and its rare collections of books, magazines, journals, brochures, leaflets and theses, important publications on the history of biological sciences and health from the seventeenth to the twentieth century. It also describes the rich original ornaments and decoration of the library room and its furniture. It recovers the history of the library these past hundred years, which is closely associated to the history of Fundação Oswaldo Cruz.

  7. Major episodes in the geologic history of western Promethei Terra, Mars

    Science.gov (United States)

    Ivanov, M. A.; Korteniemi, J.; Kostama, V.-P.; Raitala, J.; Törmänen, T.; Neukum, G.

    2010-03-01

    Geologic evolution of the western portion of Promethei Terra (40-50°S, 90-105°E) consists of two major episodes. The first was the formation of a late Noachian-early Hesperian volcanic province. During this episode a kilometer-thick suite (≈0.3 × 106 km3) of lavas accumulated to the south of Reull and Harmakhis Valles within a regional depression that probably was formed earlier in a massive erosion. A topographic barrier of the cratered terrains separates the volcanic western Promethei plateau from Hesperia Planum. Thus, the lavas could not originate from Hesperia Planum. The topographic position of western Promethei Terra excludes a possible lava feeding from Hadriaca Patera. Dikes from Tyrrhena Patera potentially could be the lava source. The massive erosion before formation of the lava plateau in western Promethei Terra is poorly consistent, however, with the hypothesis that the distal dikes served as the source and favors emplacement of sills or a local source for the lavas. The second episode after the lava plateau emplacement was surface modification by glacial, fluvial, and aeolian processes. The time of the episode is poorly known, and it could continue from the late Hesperian and through the entire Amazonian epoch. Mesas, channels, and esker-like ridges suggest that at the earlier stages of this episode (late Hesperian-early Amazonian) a glacier or ice dust deposits covered the western Promethei Terra area studied. The 50-60 × 103 km3 formation could contain 15-18 to 40-50 × 103 km3 of ice. This is comparable with the ice involved into of lobate apron formation (5-13 × 103 km3) at the later Amazonian stages of western Promethei Terra. Because of the uncertainties in the ice volume estimates, the total amount of water in the earlier glacier and later aprons was approximately the same.

  8. Morphologic Variability and Ages of Deposits Along the Arabia Terra Dichotomy Boundary, Mars

    Science.gov (United States)

    Bleamaster, L. F.; Berman, D. C.; Crown, D. A.

    2005-12-01

    Preliminary morphologic and chronologic studies of three spatially distinct regions along the Arabia Terra dichotomy boundary (Arabia Terra to Acidalia Planitia ~20N, 20W, Arabia Terra to Vastitas Borealis through Deuteronilus Mensae ~45N, 35E, and Arabia Terra to Vastitas Borealis north of Syrtis Major Planum ~40N, 70E) provide insight into post boundary formation processes, local burial, exhumation, and extensive denudation. Morphologically, the three study areas display a wide variety of post-boundary modification processes: outflow floods in the west, volcanism and tectonism in the east, and potential volatile deposition and glacial modification in the north. Preservation of these activities lies predominantly in localized linear depressions, which exhibit finely layered channel fill deposits, flood lavas, and lineated valley fill, respectively. Despite significant reworking of the surface by a variety of processes, crater-frequency plots reveal that the `highland terrains' outboard of the depressions display surface model ages that fall near or before the 3.5 Gy isochron, alluding that the crust beneath was in place across the region during the Noachian. Localized fill deposits display a variety of ages that span from the Noachian to the Amazonian. Additionally, each region displays a marked decline in the preservation of small craters (250m) suggesting significant denudation across the region. This investigation is focusing on the myriad of criss-crossing lineaments that dissect the Arabia Terra dichotomy boundary, their local morphology and origin, their temporal differences, and their orientations, all in attempt to reveal patterns of crustal structure potentially related to original dichotomy formation. Deciphering the multi-stage and multi-process geologic history remains one of several challenges in determining the origin and age of the crustal dichotomy boundary on Mars.

  9. Aqua and Terra MODIS RSB Calibration Comparison Using BRDF Modeled Reflectance

    Science.gov (United States)

    Chang, Tiejun; Xiong, Xiaoxiong; Angal, Amit; Wu, Aisheng; Geng, Xu

    2017-01-01

    The inter-comparison of MODIS reflective solar bands onboard Aqua and Terra is very important for assessment of each instrument's calibration. One of the limitations is the lack of simultaneous nadir overpasses. Their measurements over a selected Earth view target have significant differences in solar and view angles, which magnify the effects of atmospheric scattering and Bidirectional Reflectance Distribution Function (BRDF). In this work, an intercomparison technique is formulated after correction for site's BRDF and atmospheric effects. The reflectance measurements over Libya desert sites 1, 2, and 4 from both the Aqua and Terra MODIS are regressed to a BRDF model with an adjustable coefficient accounting for calibration difference. The ratio between Aqua and Terra reflectance measurements are derived for bands 1 to 9 and the results from different sites show good agreement. For year 2003, the ratios are in the range of 0.985 to1.010 for band 1 to 9. Band 3 shows the lowest ratio 0.985 and band 1 shows the highest ratio 1.010. For the year 2014, the ratio ranges from approximately 0.983 for bands 2 and 1.012 for band 8. The BRDF corrected reflectance for the two instruments are also derived for every year from 2003 to 2014 for stability assessment. Bands 1 and 2 show greater than 1 differences between the two instruments. Aqua bands 1 and 2 show downward trends while Terra bands 1 and 2 show upward trends. Bands 8 and 9 of both Aqua and Terra show large variations of reflectance measurement over time.

  10. TERRA Expression Levels Do Not Correlate With Telomere Length and Radiation Sensitivity in Human Cancer Cell Lines

    Directory of Open Access Journals (Sweden)

    Alexandra eSmirnova

    2013-05-01

    Full Text Available Mammalian telomeres are transcribed into long non-coding telomeric RNA molecules (TERRA that seem to play a role in the maintenance of telomere stability. In human cells, CpG island promoters drive TERRA transcription and are regulated by methylation. It was suggested that the amount of TERRA may be related to telomere length. To test this hypothesis we measured telomere length and TERRA levels in single clones isolated from five human cell lines: HeLa (cervical carcinoma, BRC-230 (breast cancer, AKG and GK2 (gastric cancers and GM847 (SV40 immortalized skin fibroblasts. We observed great clonal heterogeneity both in TRF (Terminal Restriction Fragment length and in TERRA levels. However, these two parameters did not correlate with each other. Moreover, cell survival to γ-rays did not show a significant variation among the clones, suggesting that, in this cellular system, the intra-population variability in telomere length and TERRA levels does not influence sensitivity to ionizing radiation. This conclusion was supported by the observation that in a cell line in which telomeres were greatly elongated by the ectopic expression of telomerase, TERRA expression levels and radiation sensitivity were similar to the parental HeLa cell line.

  11. Terra firma-forme dermatosis: A report of ten individuals with Duncan's dirty dermatosis and literature review.

    Science.gov (United States)

    Greywal, Tanya; Cohen, Philip R

    2015-07-01

    Terra-firma forme dermatosis, also known as Duncan's dirty dermatosis, is a benign skin condition that presents as dirt-like plaques in patients of all ages. We describe a series of ten patients that presented with terra-firma forme dermatosis. We reviewed PubMed for the following terms: dermatosis, Duncan's dirty dermatosis, isopropyl alcohol, terra firma, and terra firma-forme dermatosis. We also reviewed papers containing these terms and their references. The diagnosis of terra firma-forme dermatosis was confirmed in all patients who had complete resolution of each lesion after the application of 70% isopropyl alcohol. Terra-firma forme dermatosis is easily diagnosed and treated with 70% isopropyl alcohol. It is important to recognize this benign dermatologic condition since it can be confused with other cutaneous disorders. Therefore, in order to avoid unnecessary referrals, biopsies, blood tests, and medications, we suggest a trial of wiping the skin lesion with 70% isopropyl alcohol pads when the diagnosis of terra-firma forme dermatosis is considered.

  12. Web-based Dissemination of TRMM Data via TerraFly

    Science.gov (United States)

    Rishe, N. D.; Teng, B.; Rui, H.; Graham, S. C.; Gutierrez, M. E.

    2004-12-01

    Florida International University's High Performance Database Research Center (FIU HPDRC) is collaborating with the Goddard Earth Sciences Data and Information Service Center's Distributed Active Archive Center (GES DISC DAAC) to provide an easy-to-use and powerful Web-based interface to Tropical Rainfall Measuring Mission (TRMM) and other satellite data from NASA's Earth Science Enterprise (ESE). The collaboration uses FIU's TerraFly data dissemination tools to make TRMM and other data available to a wider audience of users. TerraFly is a Web-enabled system (http://terrafly.fiu.edu) designed to aid in the visualization of spatial and remote sensed imagery. This system allows one to "fly" over the Earth's surface and explore spatial data such as aerial photography, satellite imagery, street maps, and locale information. Internet capability allows the system to access numerous data sets without the installation of any specialized GIS programs. Designed for users of all levels and unlike other geographic information systems, TerraFly runs via standard Web browsers, with no need to download software or data prior to visualization. TerraFly can be delivered as a standalone application or a Web-based tool. FIU's technology of streaming incremental tiles to a Java applet allows the user to "fly" even via modem connections. While "flying" over imagery in TerraFly, the user can see various overlays, such as road names, application-relevant points that are hyperlinked to more information, and shaded zones that depict thematic map layers. The user can also view multi-spectral data by assigning bands to the RGB display and by visualizing the application of various algorithms and filters on multiple spectral bands or multiple data sets. The user can thus compare imagery of the same area acquired at different times or different imagery of the same area acquired concurrently and apply advanced visualization algorithms to the data. The FIU-GES DISC DAAC project aims to make TRMM

  13. MANEJO DE RESÍDUOS DE DEMOLIÇÃO GERADOS DURANTE OBRAS DA ARENA DE FUTEBOL PALESTRA ITÁLIA (ALLIANZ PARQUE LOCALIZADA NA CIDADE DE SÃO PAULO/BRASIL

    Directory of Open Access Journals (Sweden)

    João Alexandre Paschoalin Filho

    2014-01-01

    Full Text Available Com o incremento do crescimento econômico brasileiro e, por consequência, do nível de atividade da construção civil, a geração de resíduos provenientes deste setor consiste em um importante problema a ser sanado. Formas de reaproveitamento destes resíduos, muitas vezes na composição de novos materiais, e o desenvolvimento de modelos e ferramentas de gestão têm sido a tônica de diversos trabalhos apresentados ao meio técnico no intuito de se mitigar os efeitos causados pelo impacto da construção civil no meio ambiente, tanto natural, quanto urbano. Contudo, a ausência de políticas públicas objetivas que considerem como problema real a geração, manuseio e deposição destes resíduos ainda se constituem como importantes empecilhos na adoção de práticas de sustentabilidade. Este trabalho apresenta os aspectos gerais do manejo de resíduos gerados por operações de demolição das obras de reforma da Arena Palestra Itália (Allianz Parque localizada na cidade de São Paulo por meio de atividades de reciclagem e reuso destes materiais no canteiro das obras. Através dos parâmetros obtidos pôde-se observar que os resíduos produzidos foram predominantemente do tipo Classe A. A gestão dos resíduos produzidos na obra proporcionou ganhos econômicos significativos, uma vez em que foram reduzidos custos de transporte e aquisição de matérias primas naturais.

  14. MODIS/Terra+Aqua Photosynthetically Active Radiation Daily/3-Hour L3 Global 5km SIN Grid V006

    Data.gov (United States)

    National Aeronautics and Space Administration — The MCD18A2 Version 6 is a MODIS Terra and Aqua combined Photosynthetically Active Radiation (PAR) gridded L3 product produced daily at 5 kilometer pixel resolution...

  15. MODIS/Terra+Aqua Surface Radiation Daily/3-Hour L3 Global 5km SIN Grid V006

    Data.gov (United States)

    National Aeronautics and Space Administration — The MCD18A1 Version 6 is a MODIS Terra and Aqua combined Downward Shortwave Radiation (DSR) gridded L3 product produced daily at 5 kilometer pixel resolution with...

  16. MODIS/Terra Gross Primary Productivity 8-Day L4 Global 1km SIN Grid V055

    Data.gov (United States)

    National Aeronautics and Space Administration — The Terra/MODIS Gross Primary Productivity (GPP) product (MOD17A2) is a cumulative composite of GPP values based on the radiation-use efficiency concept that is...

  17. MODIS/Terra Aerosol Cloud Water Vapor Ozone 8-Day L3 Global 1Deg CMG V5.1

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  18. MODIS/Terra Aerosol Cloud Water Vapor Ozone Monthly L3 Global 1Deg CMG V5.1

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  19. MODIS/Terra Aerosol Cloud Water Vapor Ozone Daily L3 Global 1Deg CMG V5.1

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  20. MODIS/Terra Aerosol Cloud Water Vapor Ozone Monthly L3 Global 1Deg CMG V006

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  1. MODIS/Terra Aerosol Cloud Water Vapor Ozone 8-Day L3 Global 1Deg CMG V006

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  2. MODIS/Terra Aerosol Cloud Water Vapor Ozone Daily L3 Global 1Deg CMG V006

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  3. MODIS/Terra Surface Reflectance Daily L2G Global 1km and 500m SIN Grid V006

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD09GA Version 6 product provides an estimate of the surface spectral reflectance of Terra MODIS Bands 1-7 corrected for atmospheric conditions such as gasses,...

  4. MODIS/Terra Total Precipitable Water Vapor 5-Min L2 Swath 1km and 5km V006

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  5. MODIS/Terra Land Surface Temperature/3-Band Emissivity Daily L3 Global 1km SIN Grid Night V006

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS/Terra Land Surface Temperature/3-Band Emissivity Daily L3 Global 1km SIN Grid Night (MOD21A1N.006). A new suite of MODIS Land Surface Temperature (LST) and...

  6. MODIS/Terra Land Surface Temperature/3-Band Emissivity Daily L3 Global 1km SIN Grid Day V006

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS/Terra Land Surface Temperature/3-Band Emissivity Daily L3 Global 1km SIN Grid Day (MOD21A1D.006). A new suite of MODIS Land Surface Temperature (LST) and...

  7. MODIS/Terra Land Surface Temperature/Emissivity 5-Min L2 Swath 1km V041

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD11_L2.041 dataset was decommissioned as of October 30, 2017. Users are encouraged to use Version 6 of MODIS/Terra Land Surface Temperature and Emissivity...

  8. MODIS/Terra Near Real Time (NRT) Land Surface Temperature/Emissivity 5-Min L2 Swath 1km

    Data.gov (United States)

    National Aeronautics and Space Administration — The MODIS/Terra Near Real Time (NRT) level-2 Land Surface Temperature and Emissivity (LST/E) data (Shortname: MOD11_L2) incorporate 1 km pixels, which are produced...

  9. MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid V004

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD11A1.004 dataset was decommissioned as of October 20, 2017. Users are encouraged to use Version 6 of MODIS/Terra Land Surface Temperature and Emissivity Daily...

  10. MODIS/Terra Clouds 5-Min L2 Swath 1km and 5km V5.1

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  11. MODIS/Terra Temperature and Water Vapor Profiles 5-Min L2 Swath 5km V006

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  12. MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 0.05Deg CMG V004

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD11C1.004 dataset was decommissioned as of October 19, 2017. Users are encouraged to use Version 6 of MODIS/Terra Land Surface Temperature and Emissivity Daily...

  13. EASE-Grid 2.0 Land Cover Classifications Derived from Boston University MODIS/Terra Land Cover Data

    Data.gov (United States)

    National Aeronautics and Space Administration — These data provide land cover classifications derived from the Boston University MOD12Q1 V004 MODIS/Terra 1 km Land Cover Product (Friedl et al. 2002). The data are...

  14. MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 5km SIN Grid V041

    Data.gov (United States)

    National Aeronautics and Space Administration — The MODIS/Terra version-041 (V41) products use a modified version-4 (V4) LST algorithm and version-5 (V5) data inputs. The V41 products primarily address...

  15. MODIS/Terra Land Surface Temperature/Emissivity Monthly L3 Global 0.05Deg CMG V041

    Data.gov (United States)

    National Aeronautics and Space Administration — The MODIS/Terra version-041 (V41) products use a modified version-4 (V4) LST algorithm and version-5 (V5) data inputs. The V41 products primarily address...

  16. MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 1km SIN Grid V041

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD11A1.041 dataset was decommissioned as of October 30, 2017. Users are encouraged to use Version 6 of MODIS/Terra Land Surface Temperature and Emissivity Daily...

  17. MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 0.05Deg CMG V041

    Data.gov (United States)

    National Aeronautics and Space Administration — The MODIS/Terra version-041 (V41) products use a modified version-4 (V4) LST algorithm and version-5 (V5) data inputs. The V41 products primarily address...

  18. MODIS/Terra Land Surface Temperature/Emissivity 8-Day L3 Global 0.05Deg CMG V041

    Data.gov (United States)

    National Aeronautics and Space Administration — The MODIS/Terra version-041 (V41) products use a modified version-4 (V4) LST algorithm and version-5 (V5) data inputs. The V41 products primarily address...

  19. Terra Cucersita = Терра Кукерсита / Annely Oone

    Index Scriptorium Estoniae

    Oone, Annely

    2012-01-01

    Projektist "Ümber TERRA CUCERSITA (Põlevkivimaa)", mille eesmärk on noorte seas huvi äratamine loodus- ja täppisteaduste ja tehnoloogia ning teadus- ja arendustegevuse vastu nende kompleksse populariseerimisprogrammi kaudu

  20. Subtelomeric repetitive elements determine TERRA regulation by Rap1/Rif and Rap1/Sir complexes in yeast

    Science.gov (United States)

    Iglesias, Nahid; Redon, Sophie; Pfeiffer, Verena; Dees, Martina; Lingner, Joachim; Luke, Brian

    2011-01-01

    Telomeric repeat-containing RNA (TERRA) has been implicated in the control of heterochromatin and telomerase. We demonstrate that yeast TERRA is regulated by telomere-binding proteins in a chromosome-end-specific manner that is dependent on subtelomeric repetitive DNA elements. At telomeres that contain only X-elements, the Rap1 carboxy-terminal domain recruits the Sir2/3/4 and Rif1/2 complexes to repress transcription in addition to promoting Rat1-nuclease-dependent TERRA degradation. At telomeres that contain Y′ elements, however, Rap1 represses TERRA through recruitment of Rif1 and Rif2. Our work emphasizes the importance of subtelomeric DNA in the control of telomeric protein composition and telomere transcription. PMID:21525956

  1. Dual Binding of an Antibody and a Small Molecule Increases the Stability of TERRA G-Quadruplex.

    Science.gov (United States)

    Yangyuoru, Philip M; Di Antonio, Marco; Ghimire, Chiran; Biffi, Giulia; Balasubramanian, Shankar; Mao, Hanbin

    2015-01-12

    In investigating the binding interactions between the human telomeric RNA (TERRA) G-quadruplex (GQ) and its ligands, it was found that the small molecule carboxypyridostatin (cPDS) and the GQ-selective antibody BG4 simultaneously bind the TERRA GQ. We previously showed that the overall binding affinity of BG4 for RNA GQs is not significantly affected in the presence of cPDS. However, single-molecule mechanical unfolding experiments revealed a population (48 %) with substantially increased mechanical and thermodynamic stability. Force-jump kinetic investigations suggested competitive binding of cPDS and BG4 to the TERRA GQ. Following this, the two bound ligands slowly rearrange, thereby leading to the minor population with increased stability. Given the relevance of G-quadruplexes in the regulation of biological processes, we anticipate that the unprecedented conformational rearrangement observed in the TERRA-GQ-ligand complex may inspire new strategies for the selective stabilization of G-quadruplexes in cells.

  2. MODIS/Terra Land Surface Temperature/Emissivity Monthly L3 Global 0.05Deg CMG V004

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD11C3.004 dataset was decommissioned as of October 19, 2017. Users are encouraged to use Version 6 of MODIS/Terra Land Surface Temperature and Emissivity Daily...

  3. MODIS/Terra Land Surface Temperature/Emissivity 8-Day L3 Global 0.05Deg CMG V004

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD11C2.004 dataset was decommissioned as of October 19, 2017. Users are encouraged to use Version 6 of MODIS/Terra Land Surface Temperature and Emissivity Daily...

  4. MODIS/Terra Gross Primary Productivity 8-Day L4 Global 1km SIN Grid V005

    Data.gov (United States)

    National Aeronautics and Space Administration — The Terra/MODIS Gross Primary Productivity (GPP) product (MOD17A2) is a cumulative composite of GPP values based on the radiation-use efficiency concept that is...

  5. MODIS/Terra Vegetation Cover Conversion 96-Day L3 Global 250m SIN Grid V004

    Data.gov (United States)

    National Aeronautics and Space Administration — The MOD44A.004 dataset was decommissioned as of October 23, 2017. Users are encouraged to use Version 6 of MODIS/Terra Vegetation Continuous Fields Yearly L3 Global...

  6. Enfermedades raras y catastróficas en un hospital del norte peruano: Características y factores asociados a la mortalidad

    Directory of Open Access Journals (Sweden)

    Mario J. Valladares-Garrido

    2017-01-01

    Full Text Available Objetivos: El objetivo fue determinar las características y los factores asociados a la mortalidad en los pacientes atendidos por enfermedades raras (ER y catastróficas (EC en un hospital de la seguridad social del norte peruano. Materiales y métodos: Estudio transversal analítico, se utilizaron datos reportados de pacientes atendidos en un hospital del norte del Perú durante el año 2013. Se caracterizó a los pacientes, las enfermedades y se obtuvieron datos estadísticos de asociación. Resultados: De los 2316 pacientes, 2135 (92% tuvieron EC y 181 (8% ER. La enfermedad más común fue la insuficiencia renal crónica inespecífica (43%, pero la deficiencia hereditaria del factor VIII fue la que generó mayor gasto total (más de 850 426,35 € y por cada paciente (2115,49 €. En el análisis multivariado se encontró asociación con la mortalidad al sexo femenino (p<0,001, RPa: 1,76, IC95%:1,67-1,86, la edad (p<0,001, RPa: 1,02, IC95%:1,01-1,03 y la cantidad de días hospitalizados (p<0,001, RPa: 1,08, IC95%:1,07- 1,09, ajustando por el tipo de enfermedad. Conclusión: Existen características económicas y factores asociados a la mortalidad en los pacientes atendidos en nuestro medio, por lo que deberían realizarse más investigaciones para conocer mejor sobre este grupo, ya que generalmente se encuentra desatendido.

  7. Madelung's disease as a rare cause of obstructive sleep apnea Doença de Madelung como causa rara de apneia obstrutiva do sono

    Directory of Open Access Journals (Sweden)

    Vitor Alexandre Oliveira Fonseca

    2009-10-01

    Full Text Available Madelung's disease, or multiple symmetric lipomatosis, is a rare disease, characterized by accumulation of unencapsulated fat, generally located symmetrically around the neck and shoulders. Here, we present the case of a patient with diffuse lipomatosis accompanied by obstructive sleep apnea due to cervical involvement and facial deformity, which made it necessary to use nasal pillows for ventilation. The patient was hospitalized with a diagnosis of pneumonia and required noninvasive ventilation due to severe hypercapnia. A brief review of the literature was made, and we describe and discuss the investigation of this rare clinical case.A doença de Madelung ou lipomatose simétrica múltipla é uma doença rara, caracterizada pelo acúmulo de tecido adiposo não-encapsulado, localizado simetricamente ao redor do pescoço e na região escapular. Os autores apresentam um caso de associação entre lipomatose difusa e apneia obstrutiva do sono, devido ao envolvimento cervical e à deformação facial que exigiu a utilização de almofadas nasais para a ventilação. O doente foi admitido com o diagnóstico de pneumonia com necessidade de ventilação não-invasiva devido à hipercapnia grave. É apresentada uma breve revisão da literatura, e descrevemos e discutimos a investigação clínica deste raro caso clínico.

  8. Las estrategias de comunicación de las organizaciones de pacientes con enfermedades raras (ER en España

    Directory of Open Access Journals (Sweden)

    Antonio Castillo-Esparcia

    Full Text Available Resumen El presente estudio se centra en la estrategia de comunicación de las organizaciones de pacientes con enfermedades raras. Los objetivos de estas organizaciones son: educar e informar sobre estas patologías, sensibilizar sobre sus problemáticas y obtener legitimación social para hacer visibles sus demandas. Para llevar a cabo esta investigación, se ha analizado el impacto de este colectivo en los medios de comunicación con mayor difusión y audiencia en España: prensa, (El País, El Mundo, La Vanguardia, ABC y El Periódico, radio (Cadena Ser, Onda Cero, Cope y RNE y televisión (Telecinco, Antena 3, La 1, La Sexta, Cuatro, de 2012 a 2014. En segundo lugar, se ha realizado un estudio descriptivo de la comunicación en la web y redes sociales de 143 organizaciones nacionales. Y por último, se han elaborado encuestas telefónicas a una muestra representativa, 90 organizaciones, para relacionar la presencia mediática con la mejora de su situación económica e imagen social. Esta triangulación metodológica nos permite alcanzar los objetivos de la investigación. Se destaca mayor visibilidad social del colectivo merced a un número creciente de apariciones mediáticas, lo que propicia un aumento del número de miembros, pero no de donaciones y una mejora del conocimiento sobre estas patologías.

  9. RARE TRIPLE ANATOMICAL VARIATION OF THE CEREBRAL ARTERIAL CIRCLE; Rara triple variación del círculo arterial cerebral.

    Directory of Open Access Journals (Sweden)

    Joaquín García Pisón

    2017-04-01

    Full Text Available Se reporta la rara asociación de un aneurisma de arteria trigeminal persistente lateral derecha (Tipo II de Saltzman, aplasia del segmento pre-comunicante de ambas arterias cerebrales posteriores y la presencia de arterias cerebrales posteriores fetales en forma bilateral, en una mujer de 64 años que consultó de diplopía y parálisis del nervio abducens derecho, probablemente debida a compresión del nervio en el espacio latero-celar. Se realizó con éxito la embolización endovascular con coils, sin complicaciones inmediatas. Los hallazgos de CT, RM y angiografía son presentados. Aunque cada una de estas variaciones son infrecuentes en forma individual, la combinación de las mismas no ha sido reportada en la literatura hasta nuestro conocimiento, siendo de enorme importancia en el manejo diagnóstico y terapéutico de pacientes con stroke de mecanismo embolico, así como para la planificación de procedimientos endovasculares diagnósticos y terapéuticos. We report the rare association of an aneurysm of a lateral right persistent trigeminal artery (Saltzman type II, bilateral aplasia of the pre-communicating segment of both posterior cerebral arteries and bilateral fetal posterior cerebral arteries, in a 64 years old woman who suffered from progressive diplopia and right abducens nerve palsy, most likely due to nerve compression in the latero-cellar space. Successful endovascular coils embolization of the aneurysm was performed, with no immediate complications. CT, MR and angiographic findings are presented. Although infrequent as single variations, the association of these three arterial variations has not been reported in literature to our knowledge, having special importance in the diagnostic workup and therapeutic procedures in a patient with an embolic stroke, as well as in the planification of intracranial endovascular diagnostic and therapeutic procedures.

  10. Paraplegia aguda. Uma complicação rara da dissecção aórtica Acute paraplegia. A rare complication of aortic dissection

    Directory of Open Access Journals (Sweden)

    Renato Côrtes de Lacerda

    1998-04-01

    Full Text Available Mulher normotensa de 67 anos desenvolveu síncope, seguida de choque, e, mesmo após estabilização hemodinâmica, permaneceu anúrica. Observaram-se paraplegia e paresia do membro superior direito, além de isquemia das extremidades distais dos membros inferiores. A hipótese de dissecção aórtica aguda foi considerada e confirmada através de tomografia computadorizada, tendo sido a paraplegia atribuída a infarto isquêmico da medula espinhal. Óbito ocorreu no 4º dia de evolução, conseqüente a tamponamento pericárdico. São revistas as dificuldades diagnósticas relacionadas a manifestações pouco conhecidas da dissecção aórtica, enfatizando-se, como complicação rara, a paraplegia aguda.A 67 year-old normotensive woman had a syncope followed by shock and remained anuric after hemodynamic stabilization. Paraplegia and paresis of the right upper limb, as well as signs of ischemia of the distal lower limbs were noted. The possibility of acute aortic dissection was raised and confirmed by computed tomography. The paraplegia was attributed to an ischemic infarction of the spinal cord. The patient died on the fourth hospital day due to a pericardial tamponade. This rare and not well recognized complication of aortic dissection is briefly reviewed.

  11. Geologic Map of the MTM-20272 and-25272 Quadrangles, Tyrrhena Terra Region of Mars

    Science.gov (United States)

    Mest, Scott C.; Crown, David A.

    2006-01-01

    Introduction Mars Transverse Mercator (MTM) -20272 and -25272 quadrangles (lat 17.5?-27.5? S., long 270?-275? W.) cover part of the highlands of Tyrrhena Terra north of Hellas Planitia. The surface of the Tyrrhena Terra region records a complex history of impact cratering and modification by fluvial and eolian activity. The map area consists primarily of intercrater plains, impact crater material, and crater floor material. An extensive valley network, Vichada Valles, as well as several smaller networks, dissects the northern part of the map area. The abundance and widespread nature of fluvial features within the map area have significant implications for past Martian environmental conditions. The degraded terrains surrounding Hellas Planitia provide constraints on the role and timing of volatile-driven activity in the evolution of the highlands. The geologic history of this area may have been influenced not only by the presence of Hellas Planitia but also by other buried impact basins.

  12. Resisting Invasions: Indigenous Peoples and Land Rights Battles in Mabo and Terra Vermelha

    Directory of Open Access Journals (Sweden)

    Aline Frey

    2016-06-01

    Full Text Available http://dx.doi.org/10.5007/2175-8026.2016v69n2p151 This article examines two feature films, focusing on the link between Indigenous cinema, environmental preservation and land rights. The first film is Mabo (2012 directed by Aboriginal filmmaker Rachel Perkins. It centres on a man’ legal battle for recognition of Indigenous land’ ownership in Australia. The second film is Terra Vermelha (Birdwatchers, Marco Bechis, 2008, which centres on the violence endured by a contemporary Brazilian Indigenous group attempting to reclaim their traditional lands occupied by agribusiness barons. Based on comparative analysis of Mabo and Terra Vermelha, this article discusses the similar challenges faced by Indigenous nations in these two countries, especially the colonial dispossession of their ancestral territories and the postcolonial obstacles to reclaim and exercise self-determination over them.

  13. Using Lunar Observations to Assess Terra MODIS Thermal Emissive Bands Calibration

    Science.gov (United States)

    Xiong, Xiaoxiong; Chen, Hongda

    2010-01-01

    MODIS collects data in both the reflected solar and thermal emissive regions using 36 spectral bands. The center wavelengths of these bands cover the3.7 to 14.24 micron region. In addition to using its on-board calibrators (OBC), which include a full aperture solar diffuser (SD) and a blackbody (BB), lunar observations have been scheduled on a regular basis to support both Terra and Aqua MODIS on-orbit calibration and characterization. This paper provides an overview of MODIS lunar observations and their applications for the reflective solar bands (RSB) and thermal emissive bands (TEB) with an emphasis on potential calibration improvements of MODIS band 21 at 3.96 microns. This spectral band has detectors set with low gains to enable fire detection. Methodologies are proposed and examined on the use of lunar observations for the band 21 calibration. Also presented in this paper are preliminary results derived from Terra MODIS lunar observations and remaining challenging issues.

  14. MICROSCANNING XRF, XANES, AND XRD STUDIES OF THEDECORATED SURFACE OF ROMAN TERRA SIGILLATA CERAMICS

    Energy Technology Data Exchange (ETDEWEB)

    Mirguet, C.; Sciau, P.; Goudeau, P.; Mehta, A.; Pianetta, P.; Liu, Z.; Tamura, N.

    2008-10-24

    Different microscanning synchrotron techniques were used to better understand the elaboration process and origins of Terra Sigillata potteries from the Roman period. A mixture Gallic slip sample cross-section showing red and yellow colors was studied. The small (micron) size of the X-ray beam available at Stanford Synchrotron Radiation Laboratory (SSRL) and Advanced Light Source (ALS) synchrotron sources, coupled with the use of a sample scanning stage allowed us to spatially resolve the distribution of the constitutive mineral phases related to the chemical composition. Results show that red color is a result of iron-rich hematite crystals and the yellow part is a result of the presence of Ti-rich rutile-type phase (brookite). Volcanic-type clay is at the origin of these marble Terra Sigillata.

  15. Unmanned aircraft system measurements of the atmospheric boundary layer over Terra Nova Bay, Antarctica

    Directory of Open Access Journals (Sweden)

    S. L. Knuth

    2013-02-01

    Full Text Available In September 2009, a series of long-range unmanned aircraft system (UAS flights collected basic atmospheric data over the Terra Nova Bay polynya in Antarctica. Air temperature, wind, pressure, relative humidity, radiation, skin temperature, GPS, and operational aircraft data were collected and quality controlled for scientific use. The data have been submitted to the United States Antarctic Program Data Coordination Center (USAP-DCC for free access (doi:10.1594/USAP/0739464.

  16. Wave Processes in Arctic Seas, Observed from TerraSAR-X

    Science.gov (United States)

    2015-09-30

    work are to adapt existing TerraSAR-X wave parameter and ice motion retrieval algorithms for the marginal ice zone in order to: 2 • analyze the...test/develop formulae of wave development (such as fetch laws) for the marginal ice zone; • provide wave field characteristics and wind data to...meeting in October. RESULTS Wind, wave and ice information has been retrieved from TS-X data in the marginal ice zones and open water

  17. Patologia e reabilitação de construções em terra

    OpenAIRE

    Torgal, Fernando Pacheco; Jalali, Said

    2009-01-01

    O presente artigo aborda a questão da patologia e da reabilitação das construções tradicionais em terra, como forma de contribuir para a divulgação deste tipo de construção e para a sensibilização quanto à necessidade da promoção de construções mais “amigas do ambiente”.

  18. Prediction of Forest Stand Attributes Using TerraSAR-X Stereo Imagery

    OpenAIRE

    Mikko Vastaranta; Mikko Niemi; Mika Karjalainen; Jussi Peuhkurinen; Ville Kankare; Juha Hyyppä; Markus Holopainen

    2014-01-01

    Consistent, detailed and up-to-date forest resource information is required for allocation of forestry activities and national and international reporting obligations. We evaluated the forest stand attribute prediction accuracy when radargrammetry was used to derive height information from TerraSAR-X stereo imagery. Radargrammetric elevations were normalized to heights above ground using an airborne laser scanning (ALS)-derived digital terrain model (DTM). Derived height metrics were used as ...

  19. TERRA Expression Levels Do Not Correlate with Telomere Length and Radiation Sensitivity in Human Cancer Cell Lines.

    Science.gov (United States)

    Smirnova, Alexandra; Gamba, Riccardo; Khoriauli, Lela; Vitelli, Valerio; Nergadze, Solomon G; Giulotto, Elena

    2013-01-01

    Mammalian telomeres are transcribed into long non-coding telomeric repeat-containing RNA (TERRA) molecules that seem to play a role in the maintenance of telomere stability. In human cells, CpG-island promoters drive TERRA transcription and are regulated by methylation. It was suggested that the amount of TERRA may be related to telomere length. To test this hypothesis we measured telomere length and TERRA levels in single clones isolated from five human cell lines: HeLa (cervical carcinoma), BRC-230 (breast cancer), AKG and GK2 (gastric cancers), and GM847 (SV40 immortalized skin fibroblasts). However, these two parameters did not correlate with each other. Moreover, cell survival to γ-rays did not show a significant variation among the clones, suggesting that, in this cellular system, the intra-population variability in telomere length and TERRA levels does not influence sensitivity to ionizing radiation. This conclusion was supported by the observation that in a cell line in which telomeres were greatly elongated by the ectopic expression of telomerase, TERRA expression levels and radiation sensitivity were similar to the parental HeLa cell line.

  20. Terra Harvest Open Source Environment (THOSE): a universal unattended ground sensor controller

    Science.gov (United States)

    Gold, Joshua; Klawon, Kevin; Humeniuk, David; Landoll, Darren

    2011-06-01

    Under the Terra Harvest Program, the Defense Intelligence Agency (DIA) has the objective of developing a universal Controller for the Unattended Ground Sensor (UGS) community. The mission is to define, implement, and thoroughly document an open architecture that universally supports UGS missions, integrating disparate systems, peripherals, etc. The Controller's inherent interoperability with numerous systems enables the integration of both legacy and future Unattended Ground Sensor System (UGSS) components, while the design's open architecture supports rapid third-party development to ensure operational readiness. The successful accomplishment of these objectives by the program's Phase 3b contractors is demonstrated via integration of the companies' respective plug-'n-play contributions that include various peripherals, such as sensors, cameras, etc., and their associated software drivers. In order to independently validate the Terra Harvest architecture, L-3 Nova Engineering, along with its partner, the University of Dayton Research Institute (UDRI), is developing the Terra Harvest Open Source Environment (THOSE), a Java based system running on an embedded Linux Operating System (OS). The Use Cases on which the software is developed support the full range of UGS operational scenarios such as remote sensor triggering, image capture, and data exfiltration. The Team is additionally developing an ARM microprocessor evaluation platform that is both energyefficient and operationally flexible. The paper describes the overall THOSE architecture, as well as the implementation strategy for some of the key software components. Preliminary integration/test results and the Team's approach for transitioning the THOSE design and source code to the Government are also presented.

  1. Monitoring on Xi'an ground fissures deformation with TerraSAR-X data

    Science.gov (United States)

    Zhao, C.; Zhang, Q.; Zhu, W.; Lu, Zhiming

    2012-01-01

    Owing to the fine resolution of TerraSAR-X data provided since 2007, this paper applied 6 TerraSAR data (strip mode) during 3rd Dec. 2009 to 23rd Mar. 2010 to detect and monitor the active fissures over Xi'an region. Three themes have been designed for high precision detection and monitoring of Xi'an-Chang'an fissures, as small baseline subsets (SBAS) to test the atmospheric effects of differential interferograms pair stepwise, 2-pass differential interferogram with very short baseline perpendicular to generate the whole deformation map with 44 days interval, and finally, corner reflector (CR) technique was used to closely monitor the relative deformation time series between two CRs settled crossing two ground fissures. Results showed that TerraSAR data are a good choice for small-scale ground fissures detection and monitoring, while special considerations should be taken for their great temporal and baseline decorrelation. Secondly, ground fissures in Xi'an were mostly detected at the joint section of stable and deformable regions. Lastly, CR-InSAR had potential ability to monitor relative deformation crossing fissures with millimeter precision.

  2. On classification of sea surface oil films using TerraSAR-X satellite polarization data

    Science.gov (United States)

    Ivonin, D. V.; Ivanov, A. Yu.

    2017-09-01

    The paper presents the results of applying a new polarization method proposed in [28] to identify the type of surface pollution and differentiate between mineral oil films (crude oil and its emulsion and petroleum products) and films of other origin in sea surface radar images. The method is based on calculation of the quantitative characteristics for the ratios of suppression or intensification of scattered radio signals of different physical nature, viz., caused by capillary ripples several centimeters long, or wave breaking. TerraSAR-X satellite coaxial-polarized (VV/HH) SAR images are used. The data for analysis have been collected in areas where spots and slicks of known origin regularly occur, such as oil spills and natural oil seeps in the Gulf of Mexico and the Caspian Sea, and biogenic films in the Caspian Sea. The results of analyzing radar images from the TerraSAR-X satellite with controlled experimental oil emulsion spills in the North Sea are used for comparison. Based on the analysis of ten TerraSAR-X radar polarization images with surface sensing angles greater than 30°, it is shown that this method makes it possible to distinguish between oil spills and slicks formed by natural oil seeps and biogenic films with an accuracy higher than 80% regardless of the observation area.

  3. Corrections to MODIS Terra Calibration and Polarization Trending Derived from Ocean Color Products

    Science.gov (United States)

    Meister, Gerhard; Eplee, Robert E.; Franz, Bryan A.

    2014-01-01

    Remotely sensed ocean color products require highly accurate top-of-atmosphere (TOA) radiances, on the order of 0.5% or better. Due to incidents both prelaunch and on-orbit, meeting this requirement has been a consistent problem for the MODIS instrument on the Terra satellite, especially in the later part of the mission. The NASA Ocean Biology Processing Group (OBPG) has developed an approach to correct the TOA radiances of MODIS Terra using spatially and temporally averaged ocean color products from other ocean color sensors (such as the SeaWiFS instrument on Orbview-2 or the MODIS instrument on the Aqua satellite). The latest results suggest that for MODIS Terra, both linear polarization parameters of the Mueller matrix are temporally evolving. A change to the functional form of the scan angle dependence improved the quality of the derived coefficients. Additionally, this paper demonstrates that simultaneously retrieving polarization and gain parameters improves the gain retrieval (versus retrieving the gain parameter only).

  4. Assessment of polarization correction impact on the calibration of Terra MODIS reflective solar bands

    Science.gov (United States)

    Wu, Aisheng; Angal, Amit; Geng, Xu; Xiong, Xiaoxiong

    2017-09-01

    The Moderate-Resolution Imaging Spectroradiometer (MODIS), launched in 1999 on Terra and 2002 on Aqua spacecraft respectively, is a scanning radiometer that covers a wavelength range from 0.4 μm to 14.4 μm and scans the Earth over an angular range from -55° to +55°. After a few years in the Terra mission, it became extremely challenging to characterize the changes in the sensor gain and response versus scan angle (RVS) at short wavelengths due to significant degradation and increased polarization sensitivity. To better characterize the system-level degradation, the MODIS Characterization Support Team (MCST) developed an enhanced approach in Collection-6 (C6) L1B algorithm by supplementing the on-board calibration data with the Earth-scene response trends at various scan angles obtained from the pseudo-invariant desert sites. However, the trends at short wavelengths experienced significant impact due to the increased polarization sensitivity, especially at the end of scan. In this study, a polarization correction algorithm developed by MCST is applied to the Terra MODIS RSB response trends obtained from the desert sites. The trends after polarization correction are used to derive the gain and RVS based on the existing MODIS C6 calibration algorithm. Impact of the polarization correction is examined for gain, RVS and their fitting uncertainties over the entire mission. The results of this study provide useful information on how to further improve accuracy and stability of the calibrated L1B product.

  5. The Unique Geomorphology and Physical Properties of the Vestalia Terra Plateau

    Science.gov (United States)

    Buczkowski, D.L.; Wyrick, D.Y.; Toplis, M.; Yingst, R. A.; Williams, D. A.; Garry, W. B.; Mest, S.; Kneissl, T.; Scully, J. E. C.; Nathues, A.; hide

    2014-01-01

    We produced a geologic map of the Av-9 Numisia quadrangle of asteroid Vesta using Dawn spacecraft data to serve as a tool to understand the geologic relations of surface features in this region. These features include the plateau Vestalia Terra, a hill named Brumalia Tholus, and an unusual "dark ribbon" material crossing the majority of the map area. Stratigraphic relations suggest that Vestalia Terra is one of the oldest features on Vesta, despite a model crater age date similar to that of much of the surface of the asteroid. Cornelia, Numisia and Drusilla craters reveal bright and dark material in their walls, and both Cornelia and Numisia have smooth and pitted terrains on their floors suggestive of the release of volatiles during or shortly after the impacts that formed these craters. Cornelia, Fabia and Teia craters have extensive bright ejecta lobes. While diogenitic material has been identified in association with the bright Teia and Fabia ejecta, hydroxyl has been detected in the dark material within Cornelia, Numisia and Drusilla. Three large pit crater chains appear in the map area, with an orientation similar to the equatorial troughs that cut the majority of Vesta. Analysis of these features has led to several interpretations of the geological history of the region. Vestalia Terra appears to be mechanically stronger than the rest of Vesta. Brumalia Tholus may be the surface representation of a dike-fed laccolith. The dark ribbon feature is proposed to represent a long-runout ejecta flow from Drusilla crater.

  6. Electronic crosstalk impact assessment in the Terra MODIS mid-wave infrared bands

    Science.gov (United States)

    Wilson, Truman; Shrestha, Ashish; Xiong, Xiaoxiong

    2017-09-01

    The Moderate Resolution Imaging Spectroradiometer (MODIS) on board the Terra spacecraft is one of the key instruments in NASA's Earth Observing System. Since 2000, MODIS has collected continuous data in 36 spectral bands ranging in wavelength between 0.4 μm and 14.2 μm. Since before launch, signal contamination in the form of electronic crosstalk has been observed in many of the MODIS thermal emissive bands, particularly for bands 27-30, a correction for which has been applied to the current Collection 6 algorithm. The mid-wave infrared bands in Terra MODIS, 20-25, also show signs of electronic crosstalk contamination, which can be seen clearly during observations of the Moon. In this paper, we'll present an impact assessment of electronic crosstalk on the mid-wave infrared bands in Terra MODIS. We will also derive correction coefficients from the lunar observations, which can be applied to correct the calibrated radiance in the MODIS Level-1B product. We will provide an analysis of these results and potential improvements to the MODIS Level-1B product.

  7. Results and Lessons from a Decade of Terra MODIS On-Orbit Spectral Characterization

    Science.gov (United States)

    Xiong, X.; Choi, T.; Che, N.; Wang, Z.; Dodd, J.

    2010-01-01

    Since its launch in December 1999, the NASA EOS Terra MODIS has successfully operated for more than a decade. MODIS makes observations in 36 spectral bands from visible (VIS) to longwave infrared (LWIR) and at three nadir spatial resolutions: 250m (2 bands), 500m (5 bands), and 1km (29 bands). In addition to its on-board calibrators designed for the radiometric calibration, MODIS was built with a unique device, called the spectro-radiometric calibration assembly (SRCA). It can be configured in three different modes: radiometric, spatial, and spectral. When it is operated in the spectral modes, the SRCA can monitor changes in Sensor spectral performance for the VIS and near-infrared (NIR) spectral bands. For more than 10 years, the SRCA operation has continued to provide valuable information for MODIS on-orbit spectral performance. This paper briefly describes SRCA on-orbit operation and calibration activities; it presents decade-long spectral characterization results for Terra MODIS VIS and NIR spectral bands in terms of chances in their center wavelengths (CW) and bandwidths (BW). It is shown that the SRCA on-orbit wavelength calibration capability remains satisfactory. For most spectral bands, the changes in CW and BW are less than 0.5 and 1 nm, respectively. Results and lessons from Terra MODIS on-orbit spectral characterization have and will continue to benefit its successor, Aqua MODIS, and other future missions.

  8. Thenature of marbled Terra Sigillata slips: a combined mu XRF and mu XRD investigation

    Energy Technology Data Exchange (ETDEWEB)

    Leon, Yoanna; Sciau, Philippe; Goudeau, Philippe; Tamura, Nobumichi; Webb, Sam; Mehta, Apurva

    2009-01-31

    In addition to the red terra sigillata production, the largest Gallic workshop (La Graufesenque) made a special type of terra sigillata, called 'marbled' by the archaeologists. Produced exclusively on this site, this pottery is characterized by a surface finish made of a mixture of yellow and red slips. Because the two slips are intimately mixed, it is difficult to obtain the precise composition of one of the two constituents without contamination by the other. In order to obtain very precise correlation at the appropriate scale between the color aspect and the element and mineralogical phase distributions in the slip, combined electron microprobe, x-ray micro spectroscopies and micro diffraction on cross sectional samples were performed. The aim is to discover how potters were able to produce this unique type of terra sigillata and especially this slip showing an intense yellow color. Results show that the yellow component of marbled sigillata was made from a titanium-rich clay preparation. The color is related to the formation of a pseudobrookite (TiFe2O5) phase in the yellow part of the slip, the main characteristics of that structure being considered nowadays as essential for the fabrication of stable yellow ceramic pigments. Its physical properties such as high refractive indices and a melting point higher than that of most silicates widely used as ceramic colorants are indeed determinant for this kind of applications. Finally, the red parts have a similar composition (elementary and mineralogical) to the one of standard red slip.

  9. Biografias e movimentos de luta por terra em Pernambuco Biographies and land claim movements in Pernambuco

    Directory of Open Access Journals (Sweden)

    Marcelo C. Rosa

    2009-01-01

    Full Text Available Este artigo analisa a contribuição das chamadas "lutas por terra" para a produção de novas formas de significação social na região da Zona da Mata de Pernambuco. Por meio da análise de entrevistas com militantes dos diversos movimentos que organizam ocupações de terra na região, foi possível compreender que, além da posse de um pedaço de terra, tais organizações criam condições inéditas para a transformação dos seus líderes em figuras de destaque nas instâncias políticas dos pequenos municípios da região, contribuindo assim para a modificação das estruturas tradicionais de poder.This paper analyzes the contribution of so-called 'land struggles' in the creation of new forms of 'social meaning' in a sugar plantation region of the Brazilian Northeast. Analysis of interviews with militants from various movements coordinating land occupations in the region reveals that, as well as supporting rural people's access to land, these organizations enable their leaders to become prominent figures in local urban politics, thereby contributing to the modification of traditional power structures.

  10. The unique geomorphology and physical properties of the Vestalia Terra plateau

    Science.gov (United States)

    Buczkowski, D. L.; Wyrick, D. Y.; Toplis, M.; Yingst, R. A.; Williams, D. A.; Garry, W. B.; Mest, S.; Kneissl, T.; Scully, J. E. C.; Nathues, A.; De Sanctis, M. C.; LeCorre, L.; Reddy, V.; Hoffmann, M.; Ammannito, E.; Frigeri, A.; Tosi, F.; Preusker, F.; Roatsch, T.; Raymond, C. A.; Jaumann, R.; Pieters, C. M.; Russell, C. T.

    2014-12-01

    We produced a geologic map of the Av-9 Numisia quadrangle of asteroid Vesta using Dawn spacecraft data to serve as a tool to understand the geologic relations of surface features in this region. These features include the plateau Vestalia Terra, a hill named Brumalia Tholus, and an unusual “dark ribbon” material crossing the majority of the map area. Stratigraphic relations suggest that Vestalia Terra is one of the oldest features on Vesta, despite a model crater age date similar to that of much of the surface of the asteroid. Cornelia, Numisia and Drusilla craters reveal bright and dark material in their walls, and both Cornelia and Numisia have smooth and pitted terrains on their floors suggestive of the release of volatiles during or shortly after the impacts that formed these craters. Cornelia, Fabia and Teia craters have extensive bright ejecta lobes. While diogenitic material has been identified in association with the bright Teia and Fabia ejecta, hydroxyl has been detected in the dark material within Cornelia, Numisia and Drusilla. Three large pit crater chains appear in the map area, with an orientation similar to the equatorial troughs that cut the majority of Vesta. Analysis of these features has led to several interpretations of the geological history of the region. Vestalia Terra appears to be mechanically stronger than the rest of Vesta. Brumalia Tholus may be the surface representation of a dike-fed laccolith. The dark ribbon feature is proposed to represent a long-runout ejecta flow from Drusilla crater.

  11. Chronology of Terra Firme formation in western Amazonia and implications for the diversification of Amazonian biota

    Science.gov (United States)

    Pupim, Fabiano do N.; Sawakushi, André O.; Hartmann, Gelvam A.; Savian, Jairo F.; Kern, Andrea K.; Mineli, Thays D.; Cruz, Francisco W.; Almeida, Renato P.; Grohmann, Carlos H.; Ribas, Camila C.; d'Horta, Fernando M.; Bertassoli, Dailson J.; Marconato, André; Nogueira, Luciana; Lohmann, Lúcia G.

    2017-04-01

    The shift from a large wetland dominated by avulsive channels and flooded forests to the incised transcontinental Amazon River valley (Várzea) bounded by non-flooded forests (Terra Firme) is suggested as one of the main drivers of diversification of the mega diverse Amazonian Biota. Nonetheless, there is no consensus about the timing of this landscape shift, with the current literature suggesting a period that ranges from the Miocene (11 Ma) and the Late Pleistocene (100 ka). This uncertainty may be due to a lack of absolute ages for the sediments forming Terra Firme forest substrates in western Amazonian lowlands. In Brazil, the Içá Formation represents the uppermost fluvial deposits of Terra Firme forests substrates in western Amazonia. Therefore, a reliable chronology for the last depositional stage of the Içá Formation is key for an improved understanding of the formation of the current Terra Firme-Várzea system. Four sediment profiles were sampled along the margins of the Solimões and Içá rivers for Optically Stimulated Luminescence (OSL) dating, geomagnetic excursions, and palynological analysis. OSL dating was performed in twelve samples using a Single Aliquot Regeneration (SAR) protocol in quartz sand grains. The equivalent doses ranged from 47 to 130 Gy (Central Age Model) and the dose rate values ranged from 0.4 to 2.0 Gy/ka. The resulting sediment burial ages range from 48 to 112 ka. Paleomagnetic data were obtained from samples collected at same profiles sampled for OSL dating and results suggest the presence of Post-Blake geomagnetic excursion ( 100 ka). The age of 100 ka for Post-Blake excursion are adopted for the Geomagnetic Instability Time Scale. Pollen assemblage data show a similarity to a more modern flora and the presence of Alnus clearly points towards Pleistocene deposition as it is unknown before in South America. The combined OSL, paleomagnetism and pollen data is a robust geochronological dataset that indicates Late Pleistocene

  12. Pneumonia por Rhodococcus equi em doente VIH (+: A propósito de uma associação rara

    Directory of Open Access Journals (Sweden)

    Paula Esteves

    2007-09-01

    Full Text Available Resumo: A infecção humana por Rhodococcus equi, mesmo no contexto da infecção pelo VIH, é relativamente rara. Os autores apresentam o caso clínico de um indivíduo, infectado pelo VIH, que apresentava um quadro clínico e imagiológico compatível com pneumonia, cujos exames iniciais revelaram a presença de Pneumocystis jiroveci. Após realização de terapêutica específica, perante a manutenção do quadro clínico-imagiológico, procedeu-se à realização de novos exames complementares, tendo sido identificado a presença de Rhodococcus equi no lavado broncoalveolar. Com instituição de terapêutica dirigida a este agente, verificou--se progressiva melhoria clínica e imagiológica. Os autores efectuam uma revisão bibliográfica da pneumonia por Rhodococcus equi, salientando a raridade desta associação e a elevada sobrevida observada. Abstract: The human infection by Rhodococcus equi, even in the presence of HIV infection, remains a rare disease. The authors present a case report of pneumonia, occurring in a HIV (+ man. After identifying Pneumocystis jiroveci in the BAL, despite proper medication, the patient didn’t improve. Another BAL was performed and a Rhodoccus equi isolated. The therapeutic regimen was changed according to this finding and the patient improved. The authors make a review of the literature, focusing on the rarity of this association and the high survival observed. Palavras-chave: Rhodococcus equi, Pneumocystis jiroveci, VIH, Key-words: Rhodococcus equi, Pneumocystis jiroveci, HIV

  13. PECTORO-EPICONDYLARIS: A RARE EXTENSION OF THE PECTORALIS MAJOR MUSCLE. Pectoro-epicondilaris: Una rara extensión del músculo pectoral mayor

    Directory of Open Access Journals (Sweden)

    Sushma R Kotian

    2016-03-01

    Full Text Available El músculo pectoral mayor es propenso a varias incongruencias morfológicas. Diferentes deslizamien-tos musculares son comunes entre ellos. Sin embargo, durante la disección rutinaria de un cadáver masculino de 55 años por estudiantes de pregrado, se encontró una variante rara de la extensión tendinosa del músculo pectoral mayor. Surgía de la lámina profunda del tendón muscular bilaminar cerca de su inserción en el húmero. En su camino a unirse al tabique intermuscular medial del brazo y finalmente al epicóndilo medial del húmero, cruzó todas las estructuras en la parte delantera del brazo de lateral a medial. Considerando la extensión tendinosa de forma proximal, no se observó formación muscular separada. Esta variante de deslizamiento puede ser nombrada como músculo pectoral epicondilario. El conocimiento de esta variación particular puede ser de especial interés para los radiólogos y médicos en procedimien-tos tales como transformación de músculo, trasplante de tendón y uso en los colgajos miocutáneos durante cirugías reconstructivas. The pectoralis major muscle is prone to various morphological incongruities. Variant muscular slips are common among them. However during routine dissection for undergraduate students in a 55-year-old male cadaver, a rare variation of the tendinous extension of the pectoralis major muscle was found. It was arising from the deep lamina of the muscular bilaminar tendon close to its insertion to the humerus.  On its way to be attached to the medial intermuscular septum of the arm and finally to the medial epicondyle of the humerus, it crossed all the structures in the front of the arm from lateral to medial. Tracing this tendinous extension slip proximally, no separate muscular extension was observed. this variant slip may be named as pectoro-epicondylaris muscle. The know-ledge of this particular variation could be of special interest to radiologists and clinicians in procedures such

  14. Abcessos cerebrais múltiplos - Uma complicação rara de bronquiectasias Multiple brain abscesses - A rare complication of bronchiectasis

    Directory of Open Access Journals (Sweden)

    Natália Melo

    2009-03-01

    Full Text Available Introdução: O abcesso cerebral (AC pode surgir como complicação de uma grande variedade de infecções, traumatismos ou cirurgias. Os microrganismos podem atingir o cérebro por contiguidade ou por disseminação hematogénea. Os AC estão descritos como uma complicação rara de bronquiectasias (BQ. Caso clínico: Mulher de 44 anos com história de tuberculose pulmonar na infância e com diagnóstico de BQ bilaterais extensas que apresentou alterações do comportamento e posteriormente paresia do 6.º nervo craniano esquerdo, tendo sido diagnosticados AC múltiplos. O estudo microbiológico exaustivo foi negativo. A pesquisa de focos de infecção primária revelou apenas a presença de BQ infectadas. Efectuou tratamento antibiótico empírico e antiedematoso, com melhoria clínica progressiva. Contudo, por persistência das lesões cerebrais, foi submetida a excisão cirúrgica dos AC. Teve alta com diplopia, sem outras alterações neurológicas. Conclusão: No presente caso clínico, as BQ foram o único foco de infecção detectado, motivo pelo qual, nos doentes com esta patologia e com alterações neurológicas de novo, deverá ser pesquisada a existência de lesões infecciosas do sistema nervoso central.Background: Brain abscess can arise as a complication of a variety of infections, trauma or surgery. Bacteria can invade the brain by direct spread or through haematogenous seeding. Brain abscesses are described as a rare complication of bronchiectasis. Case description: A 44 -year -old woman with pulmonary tuberculosis in childhood and with the diagnosis of bilateral extensive bronchiectasis who presented behaviour alterations and later, paresis of the sixth cranial nerve, was diagnosed multiple brain abscesses. The microbiological exams were negative. The study of the primary focus of infection could only identify infected bronchiectasis. Empiric antibiotics and anti-oedematous treatment were prescribed with progressive clinical

  15. Anomalia de Ebstein detectada in utero e síndrome de Down: diagnóstico pré-natal de uma combinação rara

    OpenAIRE

    Leite Maria de Fátima M.P.; Gianisella Roberto B.; Zielinsky Paulo

    2004-01-01

    A anomalia de Ebstein é uma doença rara, embora seja a malformação mais comum da valva tricúspide. A associação com outras síndromes e anomalias extracardíacas é muito incomum e matéria de poucos relatos de caso. Apresenta-se um caso de diagnóstico pré-natal de anomalia de Ebstein em um paciente com síndrome de Down.

  16. Una rara complicación en la extracción del tercer molar inferior incluido: Caso clínico A rare complication during the extraction of the included inferior third molar: Case report

    OpenAIRE

    S. Aboul-Hosn Centenero; R. Sieira Gil; A. Monner Diéguez

    2009-01-01

    Presentamos una rara complicación ocurrida tras el intento de extracción del tercer molar incluido en una consulta odontológica bajo anestesia local. El paciente requirió ingreso en el servicio de urgencias para la extracción, de forma urgente, de la pieza a través de un abordaje cervical bajo anestesia general e intubación nasaotraqueal por desplazamiento de la pieza hacia la fosa submandibular durante el intento de extracción ambulatoria. El paciente presentó signos evidentes de inflamación...

  17. Análise dos resíduos madeireiros gerados nas marcenarias do município de Viçosa - Minas Gerais An analysis of the wood residues generated by carpentry shops in Viçosa, state of Minas Gerais

    Directory of Open Access Journals (Sweden)

    Zaíra Morais dos Santos Hurtado de Mendoza

    2010-08-01

    Full Text Available O objetivo deste trabalho foi analisar os resíduos gerados nas marcenarias do município de Viçosa, Minas Gerais, e propor ações potencializadoras para o seu melhor aproveitamento. Foram coletados dados sobre os resíduos de madeira gerados em 17 marcenarias da cidade, por intermédio da aplicação de questionários. Os resultados mostraram que a serragem, os sarrafos, as maravalhas e os cavacos foram os principais tipos de resíduos produzidos, sendo a serragem o resíduo mais abundante. As máquinas que mais geraram resíduos foram a desengrossadeira e a desempenadeira. A maioria das marcenarias doava ou vendia os resíduos produzidos. Constatou-se que não havia preocupação por parte dos proprietários das marcenarias quanto à agregação de valor ao resíduo gerado e quais os danos ambientais que estes poderiam ocasionar. A partir dos resultados, propuseram-se as seguintes medidas de melhor aproveitamento dos resíduos gerados: geração de energia através da queima direta de resíduos oriundos da madeira sólida, fabricação de briquetes, fertilizantes e de "pequenos objetos de madeira" (POM.The objectives of this work were to analyze the residues produced by carpentry shops in Viçosa and to propose actions that would lead to their better use. For this, data were gathered from questionnaires sent to 17 shops in town. The results showed that sawdust, wood strips, planner shavings and chips are the more common type of residues, sawdust being the most abundant. The machines that produced most of the waste were the planners and the jointers. Most of the shops either donate or sell their waste. It was found that the owners showed no regard to increasing the value of the residue or to environmental damage they may cause. Based on the information collected, the following measures are indicated for waste utilization: generation of energy through direct burning of solid wood residues, production of briquet and fertilizers and production

  18. Problemas operacionais na indústria da água: consumo excessivo de cloro na linha tronco de distribuição do sistema Gurjaú e lodos gerados pelas 6 maiores estações de tratamento de água da região metropolitana do Recife

    OpenAIRE

    Gomes Tavares, Rosangela

    2003-01-01

    A indústria de tratamento de água utiliza a água bruta proveniente de mananciais superficiais transformando-a em água tratada. O monitoramento deste processo é de extrema importância para manter a qualidade do produto gerado, o controle do proceso de tratamento e disposição dos resíduos produzidos. Neste sentido, este trabalho visou contribuir para a solução de dois problemas que ocorrem nos sistemas de água da Região Metropolitana do Recife (RMR). O primeiro se refere ao consu...

  19. TerraFERMA: The Transparent Finite Element Rapid Model Assembler for multi-physics problems in the solid Earth sciences

    Science.gov (United States)

    Spiegelman, M. W.; Wilson, C. R.; Van Keken, P. E.

    2013-12-01

    We announce the release of a new software infrastructure, TerraFERMA, the Transparent Finite Element Rapid Model Assembler for the exploration and solution of coupled multi-physics problems. The design of TerraFERMA is driven by two overarching computational needs in Earth sciences. The first is the need for increased flexibility in both problem description and solution strategies for coupled problems where small changes in model assumptions can often lead to dramatic changes in physical behavior. The second is the need for software and models that are more transparent so that results can be verified, reproduced and modified in a manner such that the best ideas in computation and earth science can be more easily shared and reused. TerraFERMA leverages three advanced open-source libraries for scientific computation that provide high level problem description (FEniCS), composable solvers for coupled multi-physics problems (PETSc) and a science neutral options handling system (SPuD) that allows the hierarchical management of all model options. TerraFERMA integrates these libraries into an easier to use interface that organizes the scientific and computational choices required in a model into a single options file, from which a custom compiled application is generated and run. Because all models share the same infrastructure, models become more reusable and reproducible. TerraFERMA inherits much of its functionality from the underlying libraries. It currently solves partial differential equations (PDE) using finite element methods on simplicial meshes of triangles (2D) and tetrahedra (3D). The software is particularly well suited for non-linear problems with complex coupling between components. We demonstrate the design and utility of TerraFERMA through examples of thermal convection and magma dynamics. TerraFERMA has been tested successfully against over 45 benchmark problems from 7 publications in incompressible and compressible convection, magmatic solitary waves

  20. TerraClimate, a high-resolution global dataset of monthly climate and climatic water balance from 1958–2015

    Science.gov (United States)

    Abatzoglou, John T.; Dobrowski, Solomon Z.; Parks, Sean A.; Hegewisch, Katherine C.

    2018-01-01

    We present TerraClimate, a dataset of high-spatial resolution (1/24°, ~4-km) monthly climate and climatic water balance for global terrestrial surfaces from 1958–2015. TerraClimate uses climatically aided interpolation, combining high-spatial resolution climatological normals from the WorldClim dataset, with coarser resolution time varying (i.e., monthly) data from other sources to produce a monthly dataset of precipitation, maximum and minimum temperature, wind speed, vapor pressure, and solar radiation. TerraClimate additionally produces monthly surface water balance datasets using a water balance model that incorporates reference evapotranspiration, precipitation, temperature, and interpolated plant extractable soil water capacity. These data provide important inputs for ecological and hydrological studies at global scales that require high spatial resolution and time varying climate and climatic water balance data. We validated spatiotemporal aspects of TerraClimate using annual temperature, precipitation, and calculated reference evapotranspiration from station data, as well as annual runoff from streamflow gauges. TerraClimate datasets showed noted improvement in overall mean absolute error and increased spatial realism relative to coarser resolution gridded datasets. PMID:29313841

  1. TerraClimate, a high-resolution global dataset of monthly climate and climatic water balance from 1958-2015.

    Science.gov (United States)

    Abatzoglou, John T; Dobrowski, Solomon Z; Parks, Sean A; Hegewisch, Katherine C

    2018-01-09

    We present TerraClimate, a dataset of high-spatial resolution (1/24°, ~4-km) monthly climate and climatic water balance for global terrestrial surfaces from 1958-2015. TerraClimate uses climatically aided interpolation, combining high-spatial resolution climatological normals from the WorldClim dataset, with coarser resolution time varying (i.e., monthly) data from other sources to produce a monthly dataset of precipitation, maximum and minimum temperature, wind speed, vapor pressure, and solar radiation. TerraClimate additionally produces monthly surface water balance datasets using a water balance model that incorporates reference evapotranspiration, precipitation, temperature, and interpolated plant extractable soil water capacity. These data provide important inputs for ecological and hydrological studies at global scales that require high spatial resolution and time varying climate and climatic water balance data. We validated spatiotemporal aspects of TerraClimate using annual temperature, precipitation, and calculated reference evapotranspiration from station data, as well as annual runoff from streamflow gauges. TerraClimate datasets showed noted improvement in overall mean absolute error and increased spatial realism relative to coarser resolution gridded datasets.

  2. Multi-scale comparisons of tree composition in Amazonian terra firme forests

    Directory of Open Access Journals (Sweden)

    L. Freitas Alvarado

    2009-11-01

    Full Text Available We explored the floristic composition of terra firme forests across Amazonia using 55 plots. Firstly, we examined the floristic patterns using both genus- and species-level data and found that the species-level analysis more clearly distinguishes among forests. Next, we compared the variation in plot floristic composition at regional- and continental-scales, and found that average among-pair floristic similarity and its decay with distance behave similarly at regional- and continental-scales. Nevertheless, geographical distance had different effects on floristic similarity within regions at distances <100 km, where north-western and south-western Amazonian regions showed greater floristic variation than plots of central and eastern Amazonia. Finally, we quantified the role of environmental factors and geographical distance for determining variation in floristic composition. A partial Mantel test indicated that while geographical distance appeared to be more important at continental scales, soil fertility was crucial at regional scales within western Amazonia, where areas with similar soil conditions were more likely to share a high number of species. Overall, these results suggest that regional-scale variation in floristic composition can rival continental-scale differences within Amazonian terra firme forests, and that variation in floristic composition at both scales is influenced by geographical distance and environmental factors, such as climate and soil fertility. To fully account for regional-scale variation in continental studies of floristic composition, future floristic studies should focus on forest types poorly represented at regional scales in current datasets, such as terra firme forests with high soil fertility in north-western Amazonia.

  3. Possible ancient giant basin and related water enrichment in the Arabia Terra province, Mars

    Science.gov (United States)

    Dohm, J.M.; Barlow, N.G.; Anderson, R.C.; Williams, J.-P.; Miyamoto, H.; Ferris, J.C.; Strom, R.G.; Taylor, G.J.; Fairen, A.G.; Baker, V.R.; Boynton, W.V.; Keller, J.M.; Kerry, K.; Janes, D.; Rodriguez, J.A.P.; Hare, T.M.

    2007-01-01

    A circular albedo feature in the Arabia Terra province was first hypothesized as an ancient impact basin using Viking-era information. To test this unpublished hypothesis, we have analyzed the Viking era-information together with layers of new data derived from the Mars Global Surveyor (MGS) and Mars Odyssey (MO) missions. Our analysis indicates that Arabia Terra is an ancient geologic province of Mars with many distinct characteristics, including predominantly Noachian materials, a unique part of the highland-lowland boundary, a prominent paleotectonic history, the largest region of fretted terrain on the planet, outflow channels with no obvious origins, extensive exposures of eroded layered sedimentary deposits, and notable structural, albedo, thermal inertia, gravity, magnetic, and elemental signatures. The province also is marked by special impact crater morphologies, which suggest a persistent volatile-rich substrate. No one characteristic provides definitive answers to the dominant event(s) that shaped this unique province. Collectively the characteristics reported here support the following hypothesized sequence of events in Arabia Terra: (1) an enormous basin, possibly of impact origin, formed early in martian history when the magnetic dynamo was active and the lithosphere was relatively thin, (2) sediments and other materials were deposited in the basin during high erosion rates while maintaining isostatic equilibrium, (3) sediments became water enriched during the Noachian Period, and (4) basin materials were uplifted in response to the growth of the Tharsis Bulge, resulting in differential erosion exposing ancient stratigraphic sequences. Parts of the ancient basin remain water-enriched to the present day. ?? 2007 Elsevier Inc. All rights reserved.

  4. Environmental health risk communication in the case "Terra dei Fuochi": content analysis of online newspaper articles.

    Science.gov (United States)

    Barchitta, M; Fragapane, S; Quattrocchi, A; Consoli, M T; Giuffrida, G; Pennisi, C; Agodi, A

    2015-01-01

    The aim of the study is to evaluate the way in which information is conveyed by one of the major national newspapers, in its online version, Repubblica.it, about health risks associated with the "Terra dei Fuochi". A retrospective systematic search in the online newspaper database was carried out for articles published from 1st January through 13th May 2014. The keyword used was "Terra dei Fuochi". A corpus, containing all articles included, was built in order to perform content analysis and text-mining using the T-LAB software, together with a critical interpretation. The co-occurrence analysis was performed using the keywords: environment, prevention, waste , risk and science. A total of 211 articles were retrieved, but only 188 articles met the inclusion criteria and were included in the analysis. The section of publication with the largest number of articles was represented by Repubblica Napoli edition with 50% of articles, whereas, only 2% of articles were included in the Environment section, and no article has been placed in the Health section. The most occurring lemmas were: waste, Naples, President, environmental - environment and health. Lemmas as disaster, drama, alarm and fear occur with medium frequency. Among the lemmas with less occurrence there were: remediation, cancer, people, information and recycle. However, terms as communication and risk management were absent. This study contributes to our understanding of how environmental health risks associated with the "Terra dei Fuochi" issue are presented by the newspapers to the public, which has implications for how the public may learn about risk management information.

  5. Columbus crater and other possible groundwater-fed paleolakes of Terra Sirenum, Mars

    Science.gov (United States)

    Wray, J.J.; Milliken, R.E.; Dundas, C.M.; Swayze, G.A.; Andrews-Hanna, J. C.; Baldridge, A.M.; Chojnacki, M.; Bishop, J.L.; Ehlmann, B.L.; Murchie, S.L.; Clark, R.N.; Seelos, F.P.; Tornabene, L.L.; Squyres, S. W.

    2011-01-01

    Columbus crater in the Terra Sirenum region of the Martian southern highlands contains light-toned layered deposits with interbedded sulfate and phyllosilicate minerals, a rare occurrence on Mars. Here we investigate in detail the morphology, thermophysical properties, mineralogy, and stratigraphy of these deposits; explore their regional context; and interpret the crater's aqueous history. Hydrated mineral-bearing deposits occupy a discrete ring around the walls of Columbus crater and are also exposed beneath younger materials, possibly lava flows, on its floor. Widespread minerals identified in the crater include gypsum, polyhydrated and monohydrated Mg/Fe-sulfates, and kaolinite; localized deposits consistent with montmorillonite, Fe/Mg-phyllosilicates, jarosite, alunite, and crystalline ferric oxide or hydroxide are also detected. Thermal emission spectra suggest abundances of these minerals in the tens of percent range. Other craters in northwest Terra Sirenum also contain layered deposits and Al/Fe/Mg-phyllosilicates, but sulfates have so far been found only in Columbus and Cross craters. The region's intercrater plains contain scattered exposures of Al-phyllosilicates and one isolated mound with opaline silica, in addition to more common Fe/Mg-phyllosilicates with chlorides. A Late Noachian age is estimated for the aqueous deposits in Columbus, coinciding with a period of inferred groundwater upwelling and evaporation, which (according to model results reported here) could have formed evaporites in Columbus and other craters in Terra Sirenum. Hypotheses for the origin of these deposits include groundwater cementation of crater-filling sediments and/or direct precipitation from subaerial springs or in a deep (???900 m) paleolake. Especially under the deep lake scenario, which we prefer, chemical gradients in Columbus crater may have created a habitable environment at this location on early Mars. ?? 2011 by the American Geophysical Union.

  6. Sixteen Years of Terra MODIS On-Orbit Operation, Calibration, and Performance

    Science.gov (United States)

    Xiong, X.; Angal, A.; Wu, A.; Link, D.; Geng, X.; Barnes, W.; Solomonson, V.

    2016-01-01

    Terra MODIS has successfully operated for more than 16 years since its launch in December 1999. From its observations, many science data products have been generated in support of a broad range of research activities and remote sensing applications. Terra MODIS has operated in a number of configurations and experienced a few anomalies, including spacecraft and instrument related events. MODIS collects data in 36 spectral bands that are calibrated regularly by a set of on-board calibrators for their radiometric, spectral, and spatial performance. Periodic lunar observations and long-term radiometric trending over well-characterized ground targets are also used to support sensor on-orbit calibration. Dedicated efforts made by the MODIS Characterization Support Team (MCST) and continuing support from the MODIS Science Team have contributed to the mission success, enabling well-calibrated data products to be continuously generated and routinely delivered to users worldwide. This paper presents an overview of Terra MODIS mission operations, calibration activities, and instrument performance of the past 16 years. It illustrates and describes the results of key sensor performance parameters derived from on-orbit calibration and characterization, such as signal-to-noise ratio (SNR), noise equivalent temperature difference (NEdT), solar diffuser (SD) degradation, changes in sensor responses, center wavelengths, and band-to-band registration (BBR). Also discussed in this paper are the calibration approaches and strategies developed and implemented in support of MODIS Level 1B data production and re-processing, major challenging issues, and lessons learned. (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

  7. Comparative analysis of the performance of mixed terraces and level and graded terraces=Análise comparativa do desempenho de terraços mistos com terraços em nível e com gradiente

    Directory of Open Access Journals (Sweden)

    Danilo Paulúcio da Silva

    2012-10-01

    Full Text Available The terracing of agricultural land is the most widespread mechanical practice used among farmers in the control of water erosion. The objective of this paper was to carry out a comparative analysis between mixed terraces and level and graded terraces. The dimensioning of level terraces was carried out based on the surface runoff volume, while the graded terrace dimensions were based on the maximum runoff flow rate. For the mixed terraces, the dimensioning was carried by considering two surface runoff hydrographs, one for the determination of the terrace channel capacity and another to estimate the flow rate at the extremity of the terrace channel. Therefore, in order to contain and transport the excess volume, an additional value was calculated and added to the depth of the channel. A case study was performed for the Uberaba, Minas Gerais State (Brazil rainfall conditions, considering events with return periods of 10, 30, and 50 years. The obtained results provided quantitative evidence that mixed terraces have a lower height than level terraces and a higher level than the graded terraces, resulting in direct consequences for the soil movement for the terrace construction.O terraceamento de terras agrícolas consiste na prática mecânica mais difundida entre os agricultores no controle da erosão hídrica. O objetivo deste trabalho foi proceder a análise comparativa do desempenho de terraços mistos com terraços em nível e com gradiente. O dimensionamento de terraços em nível foi feito com base no volume de escoamento superficial, enquanto o de terraços com gradiente foi baseado na vazão máxima de escoamento superficial. Para o dimensionamento de terraços mistos são utilizados dois hidrogramas de escoamento superficial, sendo um para a determinação da capacidade de armazenamento do terraço e o outro para a estimativa da vazão que escoa na extremidade do canal do terraço. Assim, de maneira a conter e transportar o excesso de

  8. Ten Years of MISR Observations from Terra: Looking Back, Ahead, and in Between

    Science.gov (United States)

    Diner, David J.; Ackerman, Thomas P.; Braverman, Amy J.; Bruegge, Carol J.; Chopping, Mark J.; Clothiaux, Eugene E.; Davies, Roger; Di Girolamo, Larry; Kahn, Ralph A.; Knyazikhin, Yuri; hide

    2010-01-01

    The Multi-angle Imaging SpectroRadiometer (MISR) instrument has been collecting global Earth data from NASA's Terra satellite since February 2000. With its nine along-track view angles, four visible/near-infrared spectral bands, intrinsic spatial resolution of 275 m, and stable radiometric and geometric calibration, no instrument that combines MISR's attributes has previously flown in space. The more than 10-year (and counting) MISR data record provides unprecedented opportunities for characterizing long-term trends in aerosol, cloud, and surface properties, and includes 3-D textural information conventionally thought to be accessible only to active sensors.

  9. Terra and Aqua MODIS Design, Radiometry, and Geometry in Support of Land Remote Sensing

    Science.gov (United States)

    Xiong, Xiaoxiong; Wolfe, Robert; Barnes, William; Guenther, Bruce; Vermote, Eric; Saleous, Nazmi; Salomonson, Vincent

    2011-01-01

    The NASA Earth Observing System (EOS) mission includes the construction and launch of two nearly identical Moderate Resolution Imaging Spectroradiometer (MODIS) instruments. The MODIS proto-flight model (PFM) is onboard the EOS Terra satellite (formerly EOS AM-1) launched on December 18, 1999 and hereafter referred to as Terra MODIS. Flight model-1 (FM1) is onboard the EOS Aqua satellite (formerly EOS PM-1) launched on May 04, 2002 and referred to as Aqua MODIS. MODIS was developed based on the science community s desire to collect multiyear continuous datasets for monitoring changes in the Earth s land, oceans and atmosphere, and the human contributions to these changes. It was designed to measure discrete spectral bands, which includes many used by a number of heritage sensors, and thus extends the heritage datasets to better understand both long- and short-term changes in the global environment (Barnes and Salomonson 1993; Salomonson et al. 2002; Barnes et al. 2002). The MODIS development, launch, and operation were managed by NASA/Goddard Space Flight Center (GSFC), Greenbelt, Maryland. The sensors were designed, built, and tested by Raytheon/ Santa Barbara Remote Sensing (SBRS), Goleta, California. Each MODIS instrument offers 36 spectral bands, which span the spectral region from the visible (0.41 m) to long-wave infrared (14.4 m). MODIS collects data at three different nadir spatial resolutions: 0.25, 0.5, and 1 km. Key design specifications, such as spectral bandwidths, typical scene radiances, required signal-to-noise ratios (SNR) or noise equivalent temperature differences (NEDT), and primary applications of each MODIS spectral band are summarized in Table 7.1. These parameters were the basis for the MODIS design. More details on the evolution of the NASA EOS and development of the MODIS instruments are provided in Chap. 1. This chapter focuses on the MODIS sensor design, radiometry, and geometry as they apply to land remote sensing. With near

  10. Spatial and Temporal Distribution of Clouds Observed by MODIS Onboard the Terra and Aqua Satellites

    Science.gov (United States)

    King, Michael D.; Platnick, Steven; Menzel, W. Paul; Ackerman, Steven A.; Hubanks, Paul A.

    2012-01-01

    The Moderate Resolution Imaging Spectroradiometer (MODIS) was developed by NASA and launched aboard the Terra spacecraft on December 18, 1999 and Aqua spacecraft on May 4, 2002. A comprehensive set of remote sensing algorithms for the retrieval of cloud physical and optical properties have enabled over twelve years of continuous observations of cloud properties from Terra and over nine years from Aqua. The archived products from these algorithms include 1 km pixel-level (Level-2) and global gridded Level-3 products. In addition to an extensive cloud mask, products include cloud-top properties (temperature, pressure, effective emissivity), cloud thermodynamic phase, cloud optical and microphysical parameters (optical thickness, effective particle radius, water path), as well as derived statistics. Results include the latitudinal distribution of cloud optical and radiative properties for both liquid water and ice clouds, as well as latitudinal distributions of cloud top pressure and cloud top temperature. MODIS finds the cloud fraction, as derived by the cloud mask, is nearly identical during the day and night, with only modest diurnal variation. Globally, the cloud fraction derived by the MODIS cloud mask is approx.67%, with somewhat more clouds over land during the afternoon and less clouds over ocean in the afternoon, with very little difference in global cloud cover between Terra and Aqua. Overall, cloud fraction over land is approx.55%, with a distinctive seasonal cycle, whereas the ocean cloudiness is much higher, around 72%, with much reduced seasonal variation. Cloud top pressure and temperature have distinct spatial and temporal patterns, and clearly reflect our understanding of the global cloud distribution. High clouds are especially prevalent over the northern hemisphere continents between 30 and 50 . Aqua and Terra have comparable zonal cloud top pressures, with Aqua having somewhat higher clouds (cloud top pressures lower by 100 hPa) over land due to

  11. Evolución léxico-terminológica de las enfermedades raras: revisión de los diccionarios de la real academia española

    Directory of Open Access Journals (Sweden)

    Susana RIDAO RODRIGO

    2016-04-01

    Full Text Available RESUMEN Este artículo indaga en la trayectoria terminológica de cincuenta y cuatro enfermedades raras. Se analiza el grado de aceptación lexicográfica que tienen y han tenido –a lo largo del tiempo– en su tratamiento e incorporación en los diccionarios académicos de la lengua española. Hasta la fecha, tan solo veinte de los términos seleccionados están lematizados en el DRAE, lo que representa el 37.03 %. Esta situación demuestra la inexistencia de criterios sólidos en la incorporación de términos nuevos sobre enfermedades raras en el citado diccionario general. El caso más reseñable es fibromialgia, patología que recientemente ha dejado de ser considerada una enfermedad poco frecuente y que, sin embargo, carece de lema en el DRAE. Si, por un lado, se debe asumir que el DRAE no es un diccionario médico especializado; por el otro, hay que valorar el grado de incorporación de estas voces en la vida social.

  12. Improving consistency of the ERB record measured by CERES scanners aboard Terra/Aqua/S-NPP satellites

    Science.gov (United States)

    Szewczyk, Z. Peter; Walikainen, Dale R.; Smith, Nitchie; Thomas, Susan; Priestley, Kory J.

    2017-10-01

    A purpose of this paper is to present verification of the consistency of unfiltered radiances measured by CERES instruments over their mission 2000-2016. The FM1 scanner on Terra, designated as the climate instrument, is used as a benchmark. The degradation modeling while the instruments on Terra and Aqua were operating in the RAPS mode is being revised, and the rate of the monthly degradation is shown to be 0.03%. The focus of this paper is on consistency between Terra CERES scanners, and it is a part of a broader investigation. Results of comparing FM2 and FM1 are reported for all-sky condition and selected scene types for shortwave and long-wave radiances based on Edition 4 ERBE-like (ES8) data product. Some scene type based results are also verified using an SSF product that contains imager (MODIS) information.

  13. Conversation with Lara about the Earth and Land. (Spanish Title: Conversando con Lara sobre la Tierra y la Teirra.) Conversando com Lara sobre a Terra e a Terra

    Science.gov (United States)

    da Conceição Barbosa-Lima, Maria

    2010-12-01

    en que vive es el planeta Tierra y que, probablemente por ese motivo, distingue con precisión, dentro de los limites de comprensión de la edad y madurez asociada, la tierra y la Tierra. O presente artigo analisa uma entrevista livre enquanto uma menina de quatro anos e quatro meses, matriculada na educação infantil, desenhava a Terra. A entrevista se realizou fora do ambiente escolar e sem qualquer outra pessoa por perto que pudesse interferir. De acordo com Ferreira & Silva (2004), para que o pesquisador conheça realmente o que uma criança põe no papel através de grafismos e/ou desenhos, é necessário ouvi-la durante o processo de criação do desenho. A menina apresenta, em relação à Terra, o tradicional desenho plano com o 'céu' paralelo ao solo, conforme já apresentaram Nardi & Carvalho (1996). Mas quando solicitada a desenhar o Mundo - palavra empregada em um trabalho por Butterworth et al. (2002), com intenção de não provocar 'confusões' desnecessárias para seus pesquisados - o representa de forma circular, colocando-se sobre sua superfície. Seus desenhos levaram à conclusão que esta criança ainda não tem conhecimento de que o Mundo em que vive é o Planeta Terra e que, provavelmente por este motivo, diferencia com precisão, dentro dos limites impostos por sua idade e consequente maturidade, a terra e a Terra.

  14. Doença de Marchiafava-Bignami: uma rara entidade com prognóstico sombrio Marchiafava-Bignami disease: a rare entity with a poor outcome

    Directory of Open Access Journals (Sweden)

    Paulo Eduardo Mestrinelli Carrilho

    2013-03-01

    Full Text Available A doença de Marchiafava-Bignami é uma entidade rara, caracterizada por uma degeneração primária do corpo caloso, associada com o consumo crônico do etanol. A doença pode, ocasionalmente, ocorrer em pacientes não etilistas cronicamente desnutridos. Uma deficiência de vitaminas do complexo B é considerada como a hipótese etiopatogênica principal, uma vez que muitos pacientes obtiveram uma melhora após a administração desses compostos. Algumas vezes, entretanto, tal resposta terapêutica não foi observada. O diagnóstico definitivo da doença de Marchiafava-Bignami pode ser problemático e depende das características de estudos de neuroimagem, especialmente a ressonância magnética. Seu tratamento, dessa forma, é ainda controverso, com resultados variáveis. Como estão implicados fatores nutricionais, analogamente à encefalopatia de Wernicke, alguns autores recomendam a reposição de vitaminas do complexo B, particularmente da B1. O presente artigo relata a forma aguda da doença de Marchiafava-Bignami em um paciente masculino dependente do álcool, que apresentou discreta melhora após a administração parenteral das vitaminas do complexo B. Como consequência de suas más condições neurológicas e imunológicas, ele desenvolveu infecções pulmonares múltiplas e permaneceu, por longo tempo, na unidade de terapia intensiva. Seu óbito ocorreu por sepse causada por um fungo raro, o Rhodotorula mucilaginosa. O artigo é um relato clínico da evolução desse paciente, com a apresentação de seus dados de neuroimagem, acompanhada por uma revisão sobre doença de Marchiafava-Bignami e sobre as infecções por Rhodotorula dentro da perspectiva da unidade de cuidado intensivo.Marchiafava-Bignami disease is a rare affliction characterized by primary degeneration of the corpus callosum associated with chronic consumption of ethanol. The disease may occasionally occur in patients who are not alcoholics but are chronically

  15. Abcessos cerebrais múltiplos – Uma complicação rara de bronquiectasias

    Directory of Open Access Journals (Sweden)

    Natália Melo

    2009-03-01

    Full Text Available Resumo: Introdução: O abcesso cerebral (AC pode surgir como complicação de uma grande variedade de infecções, traumatismos ou cirurgias. Os microrganismos podem atingir o cérebro por contiguidade ou por disseminação hematogénea. Os AC estão descritos como uma complicação rara de bronquiectasias (BQ. Caso clínico: Mulher de 44 anos com história de tuberculose pulmonar na infância e com diagnóstico de BQ bilaterais extensas que apresentou alterações do comportamento e posteriormente paresia do 6.° nervo craniano esquerdo, tendo sido diagnosticados AC múltiplos. O estudo microbiológico exaustivo foi negativo. A pesquisa de focos de infecção primária revelou apenas a presença de BQ infectadas. Efectuou tratamento antibiótico empírico e antiedematoso, com melhoria clínica progressiva. Contudo, por persistência das lesões cerebrais, foi submetida a excisão cirúrgica dos AC. Teve alta com diplopia, sem outras alterações neurológicas. Conclusão: No presente caso clínico, as BQ foram o único foco de infecção detectado, motivo pelo qual, nos doentes com esta patologia e com alterações neurológicas de novo, deverá ser pesquisada a existência de lesões infecciosas do sistema nervoso central. Abstract: Background: Brain abscess can arise as a complication of a variety of infections, trauma or surgery. Bacteria can invade the brain by direct spread or through haematogenous seeding. Brain abscesses are described as a rare complication of bronchiectasis. Case description: A 44-year-old woman with pulmonary tuberculosis in childhood and with the diagnosis of bilateral extensive bronchiectasis who presented behaviour alterations and later, paresis of the sixth cranial nerve, was diagnosed multiple brain abscesses. The microbiological exams were negative. The study of the primary focus of infection could only identify

  16. Abcessos cerebrais múltiplos – Uma complicação rara de bronquiectasias

    Directory of Open Access Journals (Sweden)

    Natália Melo

    2009-03-01

    Full Text Available Resumo: Introdução: O abcesso cerebral (AC pode surgir como complicação de uma grande variedade de infec-ções, traumatismos ou cirurgias. Os microrganismos podem atingir o cérebro por contiguidade ou por dis-seminação hematogénea. Os AC estão descritos como uma complicação rara de bronquiectasias (BQ.Caso clínico: Mulher de 44 anos com história de tuberculose pulmonar na infância e com diagnóstico de BQ bilaterais extensas que apresentou alterações do comportamento e posteriormente paresia do 6.º ner-vo craniano esquerdo, tendo sido diagnosticados AC múltiplos. O estudo microbiológico exaustivo foi negativo. A pesquisa de focos de infecção primária revelou apenas a presença de BQ infectadas. Efectuou tratamento antibiótico empírico e antiedematoso, com melhoria clínica progressiva. Contudo, por persistência das lesões cerebrais, foi submetida a excisão cirúrgica dos AC. Teve alta com diplopia, sem outras alterações neurológicas.Conclusão: No presente caso clínico, as BQ foram o único foco de infecção detectado, motivo pelo qual, nos doentes com esta patologia e com alterações neurológicas de novo, deverá ser pesquisada a existência de lesões infecciosas do sistema nervoso central.Rev Port Pneumol 2009; XV (2: 319-324 Abstract: Background: Brain abscess can arise as a complication of a variety of infections, trauma or surgery. Bac-teria can invade the brain by direct spread or through haematogenous seeding. Brain abscesses are described as a rare complication of bronchiectasis.Case description: A 44-year-old woman with pul-monary tuberculosis in childhood and with the diagnosis of bilateral extensive bronchiectasis who presented behaviour alterations and later, paresis of the sixth cranial nerve, was diagnosed multiple brain abscesses. The microbiological exams were negative. The study of the primary focus

  17. Non-invasive methods to establish the diagnosis of terra firma-forme dermatosis: The SMART (Skin Modified by Alcohol Rubbing Test) evaluation and dermoscopy.

    Science.gov (United States)

    Greywal, Tanya; Cohen, Philip R

    2016-06-15

    Terra firma-forme dermatosis may mimic a variety of hyper pigmented dermatoses.  The diagnosis can be characterized using dermoscopy and confirmed with the SMART (Skin Modified by Alcohol Rubbing Test) evaluation.  When terra firma-forme dermatosis (Duncan's dirty dermatosis) is clinically suspected, clearance of the dermatosis follows rubbing the affected skin with 70% isopropyl alcohol.

  18. Draft Genome Sequence of the Soil Bacterium Burkholderia terrae Strain BS001, Which Interacts with Fungal Surface Structures

    DEFF Research Database (Denmark)

    Nazir, Rashid; Hansen, Martin A.; Sorensen, Soren

    2012-01-01

    Burkholderia terrae BS001 is a soil bacterium which was originally isolated from the mycosphere of the ectomycorrhizal fungus Laccaria proxima. It exhibits a range of fungus-interacting traits which reveal its propensity to actively interact at fungal interfaces. Here, we present the approximately...... 11.5-Mb (G+C content, 61.52 draft genome sequence of B. terrae BS001 with the aim of providing insight into the genomic basis of its ecological success in fungus-affected soil settings....

  19. Probe development for detection of TERRA 1 intramolecular G-quadruplex formation using a fluorescent adenosine derivative.

    Science.gov (United States)

    Kim, In Sun; Seo, Young Jun

    2014-03-15

    We developed a probing system to detect the intramolecular G-quadruplex of telomeric repeat-containing RNA (TERRA 1). We used a fluorescent adenosine derivative rA(py) as a fluorophore and incorporated it into the dangling position of the parallel-type G-quadruplex sequence of TERRA 1. The rA(py)-modified G-quadruplex structure exhibited a strong fluorescence emission signal, while the emission signals of the single-strand and duplex structures were much lower. Copyright © 2014 Elsevier Ltd. All rights reserved.

  20. Coogoon Valles, western Arabia Terra: Hydrological evolution of a complex Martian channel system

    Science.gov (United States)

    Molina, Antonio; López, Iván; Prieto-Ballesteros, Olga; Fernández-Remolar, David; de Pablo, Miguel Ángel; Gómez, Felipe

    2017-09-01

    Coogoon Valles is an intricate fluvial system, and its main channel was formed during the Noachian period through the erosion of the clay-bearing basement of the Western Arabia Terra. This region is characterized by a thinner crust compared to the rest of the highlands and by the occurrence of massive phyllosilicate-bearing materials. The origin of this region is still under discussion. Its surface has been exposed to a large-scale volcanism, and several episodes of extensive denudation were primarily controlled by fluvial activity. In this regard, the study of the oldest channels in Arabia Terra is crucial for understanding the global geological evolution of early Mars. The reactivation of the hydrological system by sapping followed by aeolian erosion had reshaped the channel, as well as exposed ancient materials and landforms. The examination of the bed deposits suggests an old episode of detrital sedimentation covering the Noachian basement followed by an erosive event that formed the current Coogoon Valles configuration. A complex system of deltas and alluvial fans is situated at the termination of this channel, which has been proposed as a landing site for the upcoming ExoMars and Mars 2020 missions.

  1. Quantitative method study of sand-dust information using Terra/MODIS data

    Science.gov (United States)

    Li, Haiping; Xiong, Liya; Zhuang, Dafang

    2003-07-01

    With the successful launching of the new generation satellite of EOS Terra, its Moderate Resolution Imaging Spectroradiometer (MODIS) data has more advantages in comprehensive research of land, ocean and atmosphere. ALso it can be used in disaster monitoring and losing assessment. This article focuses on the discussion of using Terra/MODIS data to study sand-dust information quantitative retrieval method. The conclusion is that MODIS data can be used to study the quantitative retrieval of sand-dust information and the study scenario has certain feasibility. The study contains of selecting the characteristic spectrum bands of sand-dust information; separating sand-dust information from the background and enhancing the weak information of floating dust, raising dust, etc. Theory basis of quantitative retrieval method are remote sensing quantitative method, atmosphere radiative transforming and visibility theories. Data pre-processing is also necessary. Retrieving of sand-dust aerosol optic thickness is more difficult and also the key problem to resolve. Case study is necessary and should be used to support the quantitative method. The study can provide the theory basis and technique support for sand-dust disaster forecasting monitoring and preventing.

  2. Terra-cotta figurines from the Roman theatre of Malaga (Spain): An archaeometric study

    Energy Technology Data Exchange (ETDEWEB)

    Compana, J. M.; Cabeza, M. A.; Leon-Reina, L.; Corrales, M.; Corrales, M. P.

    2014-10-01

    A series of 22 figured Phoeno-Punic and Roman terra-cottas, of high relevant archaeological and patrimonial values, have been studied. The samples were recovered in the Roman Theatre of Malaga (Spain). A thorough analysis including stereomicroscopy, elemental analysis by WDXRF, mineralogical analysis by XRPD coupled with the Rietveld method, and SEM, has been carried out. Highly diluted fused glass beads probed to be enough for the X-ray fluorescence analyses, minimizing the damage to the samples. For selected samples, in addition to the classical use of the Rietveld method, the G-factor external-standard approach has been employed to get full quantitative crystalline and amorphous phase analysis. The analytical results allow proposing a local/regional provenance for the main part of the samples, being a relevant data for several artifacts, not contextualized due to stratigraphic alterations in the site. In addition, some relevant samples, for instance a theatrical mask fragment (TRC005), are likely foreign. The overall amorphous is not negligible in phase quantification, accounting for up to 50 wt %. Technologically, all terra-cotta samples are similar, made of calcareous clays, fired at ∼700-950 degree centigrade. (Author)

  3. Risco de salinização das terras do baixo Acaraú (CE

    Directory of Open Access Journals (Sweden)

    Lydia Helena da Silva de Oliveira Mota

    2012-08-01

    Full Text Available Em determinadas condições de relevo, do clima e de uso, com certa frequência pode acontecer acúmulo de sais nos solos, dando lugar à formação dos solos salinos e sódicos - também denominados de solos afetados por sais. A fim de orientar as práticas de manejo e uso das terras da região do Baixo Acaraú, CE, objetivou-se com o presente trabalho gerar um mapa de risco de salinização. Para obtenção das classes de vulnerabilidade, foram avaliados os temas pedologia, geologia, geomorfologia e uso e cobertura das terras e informações de declividade e altimetria, tratados em ambiente SIG com o método multicritério aditivo. Foram definidas quatro classes de risco de salinização: baixo, moderado, alto e altíssimo ou solos naturalmente salinos/sódicos. Foi constatado que 35,47 % da área corresponde à classe de baixo risco de salinização; 26,22 %, à de risco moderado; 8,23 %, à de risco alto; e 19,65 %, à de risco altíssimo.

  4. First results from the GPS atmosphere sounding experiment TOR aboard the TerraSAR-X satellite

    Directory of Open Access Journals (Sweden)

    G. Beyerle

    2011-07-01

    Full Text Available GPS radio occultation events observed between 24 July and 17 November 2008 by the IGOR occultation receiver aboard the TerraSAR-X satellite are processed and analyzed. The comparison of 15 327 refractivity profiles with collocated ECMWF data yield a mean bias between zero and −0.30 % at altitudes between 5 and 30 km. Standard deviations decrease from about 1.4 % at 5 km to about 0.6 % at 10 km altitude, however, increase significantly in the upper stratosphere. At low latitudes mean biases and standard deviations are larger, in particular in the lower troposphere. The results are consistent with 15 159 refractivity observations collected during the same time period by the BlackJack receiver aboard GRACE-A and processed by GFZ's operational processing system. The main difference between the two occultation instruments is the implementation of open-loop signal tracking in the IGOR (TerraSAR-X receiver which improves the tropospheric penetration depth in terms of ray height by about 2 km compared to the conventional closed-loop data acquired by BlackJack (GRACE-A.

  5. Detection and Characterization of Hedgerows Using TerraSAR-X Imagery

    Directory of Open Access Journals (Sweden)

    Julie Betbeder

    2014-04-01

    Full Text Available Whilst most hedgerow functions depend upon hedgerow structure and hedgerow network patterns, in many ecological studies information on the fragmentation of hedgerows network and canopy structure is often retrieved in the field in small areas using accurate ground surveys and estimated over landscapes in a semi-quantitative manner. This paper explores the use of radar SAR imagery to (i detect hedgerow networks; and (ii describe the hedgerow canopy heterogeneity using TerraSAR-X imagery. The extraction of hedgerow networks was achieved using an object-oriented method using two polarimetric parameters: the Single Bounce and the Shannon Entropy derived from one TerraSAR-X image. The hedgerow canopy heterogeneity estimated from field measurements was compared with two backscattering coefficients and three polarimetric parameters derived from the same image. The results show that the hedgerow network and its fragmentation can be identified with a very good accuracy (Kappa index: 0.92. This study also reveals the high correlation between one polarimetric parameter, the Shannon entropy, and the canopy fragmentation measured in the field. Therefore, VHSR radar images can both precisely detect the presence of wooded hedgerow networks and characterize their structure, which cannot be achieved with optical images.

  6. Necromass in forests of Madre de Dios, Peru: a comparison between terra firme and lowland forests

    Directory of Open Access Journals (Sweden)

    Alejandro Araujo-Murakami

    2011-06-01

    Full Text Available Stocks of dead wood or necromass represent an important portion of biomass and nutrients in tropical forests. The objectives of this study were: 1 to evaluate and compare the necromass of “terra firme” and lowlands forests, (2 to study the relationship between necromass, above-ground biomass and wood density, and (3 to estimate the necromass of the department of Madre de Dios, Peru. Stocks of necromass and above-ground biomass were estimated at three different locations using permanent plots and line intercept transects. The average volume of necromass for the three sites was 72.9 m3 ha-1 with an average weight varying between 24.8 and 30.7 Mg ha-1, depending on the estimations of dead wood density used for the calculations. Terra firme forests had significantly higher stocks of necromass than lowland forests. The amount of necromass was 11% of the total above-ground biomass in Madre de Dios forests. The total stock of carbon stored in dead wood for the entire department of Madre de Dios was estimated to be approximately 100 mega tonnes of carbon. This is ten times more than the annual fossil fuel emissions of Peru between 2000 and 2008. The substantial stocks of necromass emphasize the importance of these types of field studies, considering that this component of tropical forest carbon cannot be detected using other methods such as satellite remote sensing.

  7. Lunar calibration improvements for the short-wave infrared bands in Aqua and Terra MODIS

    Science.gov (United States)

    Wilson, Truman; Angal, Amit; Shrestha, Ashish; Xiong, Xiaoxiong

    2017-09-01

    The Moderate Resolution Imaging Spectroradiometer (MODIS) is one of the key sensors among a suite of remote sensing instruments on board the Terra and Aqua spacecrafts. Since the beginning of each mission, regularly scheduled lunar observations have been used in order to track the on-orbit gain changes of the reflective solar bands. However, for the short-wave infrared bands, 5-7 and 26, the measured signal is contaminated by both electronic crosstalk and an out-of-band response due to transmission through the MODIS filters at undesired wavelengths. These contaminating signals cause significant oscillations in the derived gain from lunar observations for these bands, which limits their use in determining the scan mirror response versus scan angle at these wavelengths. In this paper, we show a strategy for correcting the electronic crosstalk contamination using lunar observations, where the magnitude and the source of the contaminating signal is clear. For Aqua MODIS, we find that the magnitude of the electronic crosstalk contamination is small, and the lunar calibration remains relatively unaffected. For Terra MODIS, the contamination is more significant, and the electronic crosstalk correction shows a significant reduction in the oscillations of the lunar calibration results.

  8. Recent Progress on Cross-Comparison of Terra and Aqua MODIS Calibration Using Dome C

    Science.gov (United States)

    Xiong, X.; Wu, A.; Angal, A.; Wenny, B.

    2009-01-01

    For the past few years, the MODIS Characterization Support Team (MCST) at NASA/GSFC has continued to evaluate the Terra and Aqua MODIS calibration long-term stability and their calibration consistency using sensor observations over the Dome Concordia, Antarctica. Early results from Dome C observations show that the calibration of bands I and 2 (0.65 and 0.86 micron) is consistent within 1-2% and bands 31 and 32 (11 and 12 micron) differences are less than a couple of tenths of Kelvin, demonstrating that this site can provide a useful calibration reference for a wide range of Earth-observing sensors from visible (VIS) to long-wave infrared (LWIR). Recently, the Dome C area has been endorsed by the CEOS as a reference standard site for sensor cross-comparison. This, as a result, has led to an invitation to the broad community to participate in a CEOS comparison of top-of-atmosphere (TOA) spectral radiance/reflectance over Dome C. In this paper, we provide a brief description of the methodologies and report our recent progress on cross-comparison of Terra and Aqua MODIS spectral bands using observations over this area, including data provided in support of the upcoming CEOS comparison. Emphasis of this paper is on the long-term data records of MODIS instruments, their calibration consistency, and challenging issues.

  9. Heat shock factor 1 promotes TERRA transcription and telomere protection upon heat stress.

    Science.gov (United States)

    Koskas, Sivan; Decottignies, Anabelle; Dufour, Solenne; Pezet, Mylène; Verdel, André; Vourc'h, Claire; Faure, Virginie

    2017-06-20

    In response to metabolic or environmental stress, cells activate powerful defense mechanisms to prevent the formation and accumulation of toxic protein aggregates. The main orchestrator of this cellular response is HSF1 (heat shock factor 1), a transcription factor involved in the up-regulation of protein-coding genes with protective roles. It has become very clear that HSF1 has a broader function than initially expected. Indeed, our previous work demonstrated that, upon stress, HSF1 activates the transcription of a non-coding RNA, named Satellite III, at pericentromeric heterochromatin. Here, we observe that the function of HSF1 extends to telomeres and identify subtelomeric DNA as a new genomic target of HSF1. We show that the binding of HSF1 to subtelomeric regions plays an essential role in the upregulation of non-coding TElomeric Repeat containing RNA (TERRA) transcription upon heat shock. Importantly, our data show that telomere integrity is impacted by heat shock and that telomeric DNA damages are markedly enhanced in HSF1 deficient cells. Altogether, our findings reveal a new direct and essential function of HSF1 in the transcriptional activation of TERRA and in telomere protection upon stress. © The Author(s) 2017. Published by Oxford University Press on behalf of Nucleic Acids Research.

  10. Terra and Aqua MODIS Thermal Emissive Bands On-Orbit Calibration and Performance

    Science.gov (United States)

    Xiong, Xiaoxiong; Wu, Aisheng; Wenny, Brian N.; Madhavan, Sriharsha; Wang, Zhipeng; Li, Yonghong; Chen, Na; Barnes, William L.; Salomonson, Vincent V.

    2015-01-01

    Since launch, the Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on the Terra and Aqua spacecraft have operated successfully for more than 14 and 12 years, respectively. A key instrument for National Aeronautics and Space Administration Earth Observing System missions, MODIS was designed to make continuous observations for studies of Earth's land, ocean, and atmospheric properties and to extend existing data records from heritage Earth observing sensors. The 16 thermal emissive bands (TEBs) (3.75-14.24 micrometers) are calibrated on orbit using a temperature controlled blackbody (BB). Both Terra and Aqua MODIS BBs have displayed minimal drift over the mission lifetime, and the seasonal variations of the BB temperature are extremely small in Aqua MODIS. The long-term gain and noise equivalent difference in temperature performance of the 160 TEB detectors on both MODIS instruments have been well behaved and generally very stable. Small but noticeable variations of Aqua MODIS bands 33-36 (13.34-14.24 micrometer) response in recent years are primarily due to loss of temperature control margin of its passive cryoradiative cooler. As a result, fixed calibration coefficients, previously used by bands when the BB temperature is above their saturation temperatures, are replaced by the focal-plane-temperature-dependent calibration coefficients. This paper presents an overview of the MODIS TEB calibration, the on-orbit performance, and the challenging issues likely to impact the instruments as they continue operating well past their designed lifetime of six years.

  11. Cross-Calibration of Earth Observing System Terra Satellite Sensors MODIS and ASTER

    Science.gov (United States)

    McCorkel, J.

    2014-01-01

    The Advanced Spaceborne Thermal Emissive and Reflection Radiometer (ASTER) and Moderate Resolution Imaging Spectrometer (MODIS) are two of the five sensors onboard the Earth Observing System's Terra satellite. These sensors share many similar spectral channels while having much different spatial and operational parameters. ASTER is a tasked sensor and sometimes referred to a zoom camera of the MODIS that collects a full-earth image every one to two days. It is important that these sensors have a consistent characterization and calibration for continued development and use of their data products. This work uses a variety of test sites to retrieve and validate intercalibration results. The refined calibration of Collection 6 of the Terra MODIS data set is leveraged to provide the up-to-date reference for trending and validation of ASTER. Special attention is given to spatially matching radiance measurements using prelaunch spatial response characterization of MODIS. Despite differences in spectral band properties and spatial scales, ASTER-MODIS is an ideal case for intercomparison since the sensors have nearly identical views and acquisitions times and therefore can be used as a baseline of intercalibration performance of other satellite sensor pairs.

  12. Trends in Ocean Irradiance using a Radiative Model Forced with Terra Aerosols and Clouds

    Science.gov (United States)

    Gregg, Watson; Casey, Nancy; Romanou, Anastasia

    2010-01-01

    Aerosol and cloud information from MODIS on Terra provide enhanced capability to understand surface irradiance over the oceans and its variability. These relationships can be important for ocean biology and carbon cycles. An established radiative transfer model, the Ocean-Atmosphere Spectral Irradiance Model (OASIM) is used to describe ocean irradiance variability on seasonal to decadal time scales. The model is forced with information on aerosols and clouds from the MODIS sensor on Terra and Aqua. A 7-year record (2000-2006) showed no trends in global ocean surface irradiance or photosynthetic available irradiance (PAR). There were significant (P20 W/sq m. The trends using MODIS data contrast with results from OASIM using liquid water path estimates from the International Satellite Cloud Climatology Project (ISCCP). Here, a global trend of -2 W/sq m was observed, largely dues to a large negative trend in the Antarctic -12 W/sq m. These results suggest the importance of the choice of liquid water path data sets in assessments of medium-length trends in ocean surface irradiance. The choices also impact the evaluation of changes in ocean biogeochemistry.

  13. Assessments and Applications of Terra and Aqua MODIS On-Orbit Electronic Calibration

    Science.gov (United States)

    Xiong, Xiaoxiong; Chen, Na; Li, Yonghong; Wilson, Truman

    2016-01-01

    MODIS has 36 spectral bands located on four focal plane assemblies (FPAs), covering wavelengths from 0.41 to 14.4 micrometers. MODIS bands 1-30 collect data using photovoltaic (PV) detectors and, therefore, are referred to as the PV bands. Similarly, bands 31-36 using photoconductive (PC) detectors are referred to as the PC bands.The MODIS instrument was built with a set of on-board calibrators (OBCs) in order to track on-orbit changes of its radiometric, spatial, and spectral characteristics. In addition, an electronic calibration (ECAL) function can be used to monitor on-orbit changes of its electronic responses (gains). This is accomplished via a series of stair step signals generated by the ECAL function. These signals, in place of the FPA detector signals, are amplified and digitized just like the detector signals. Over the entire mission of both Terra and Aqua MODIS,the ECAL has been performed for the PV bands and used to assess their on-orbit performance. This paper provides an overview of MODIS on-orbit calibration activities with a focus on the PV ECAL, including its calibration process and approaches used to monitor the electronic performance. It presents the results derived and lessons learned from Terra and Aqua MODIS on-orbit ECAL. Also discussed are some of the applications performed with the information provided by the ECAL data.

  14. Geologic Mapping along the Arabia Terra Dichotomy Boundary: Mawrth Vallis and Nili Fossae, Mars

    Science.gov (United States)

    Bleamaster, Leslie F., III; Crown, David A.

    2009-01-01

    Geologic mapping studies at the 1:1M-scale are being used to assess geologic materials and processes that shape the highlands along the Arabia Terra dichotomy boundary. In particular, this mapping will evaluate the distribution, stratigraphic position, and lateral continuity of compositionally distinct outcrops in Mawrth Vallis and Nili Fossae as identified by spectral instruments currently in orbit. Placing these landscapes, their material units, structural features, and unique compositional outcrops into spatial and temporal context with the remainder of the Arabia Terra dichotomy boundary may provide constraints on: 1) origin of the dichotomy boundary, 2) paleo-environments and climate conditions, and 3) various fluvial-nival modification processes related to past and present volatile distribution and their putative reservoirs (aquifers, lakes and oceans, surface and ground ice) and the influences of nearby volcanic and tectonic features on hydrologic processes in these regions. The results of this work will include two 1:1M scale geologic maps of twelve MTM quadrangles (Mawrth Vallis - 20022, 20017, 20012, 25022, 25017, and 25012; and Nili Fossae - 20287, 20282, 25287, 25282, 30287, 30282).

  15. Retrieval of Both Soil Moisture and Texture Using TerraSAR-X Images

    Directory of Open Access Journals (Sweden)

    Azza Gorrab

    2015-08-01

    Full Text Available The aim of this paper is to propose a methodology combing multi-temporal X-band SAR images (TerraSAR-X with continuous ground thetaprobe measurements, for the retrieval of surface soil moisture and texture at a high spatial resolution. Our analysis is based on seven radar images acquired at a 36° incidence angle in the HH polarization, over a semi-arid site in Tunisia (North Africa. The soil moisture estimations are based on an empirical change detection approach using TerraSAR-X data and ground auxiliary thetaprobe network measurements. Two assumptions were tested: (1 roughness variations during the three-month radar acquisition campaigns were not accounted for; (2 a simple correction for temporal variations in roughness was included. The results reveal a small improvement in the estimation of soil moisture when a correction for temporal variations in roughness is introduced. By considering the estimated temporal dynamics of soil moisture, a methodology is proposed for the retrieval of clay and sand content (expressed as percentages in soil. Two empirical relationships were established between the mean moisture values retrieved from the seven acquired radar images and the two soil texture components over 36 test fields. Validation of the proposed approach was carried out over a second set of 34 fields, showing that highly accurate clay estimations can be achieved. Maps of soil moisture, clay and sand percentages at the studied site are derived.

  16. Panorama nobiliario nas terras de Camba e Rodeiro no tránsito á Idade Moderna

    Directory of Open Access Journals (Sweden)

    Gómez Buxán, César

    2008-12-01

    Full Text Available To realize a small tour for the history, genealogy and heraldry of the former gentlemanly lineages of the land of Rodeiro from the Middle Ages is the aim that finally is claimed. The evolution that begins in the medieval fortresses and continues in towers of transition, finishes off in the typical residences of the nobility, of which Trasulfe is the best exponent. The article, in brief extension will try to use as guide or initiation to studies more detailed, necessary for the comprehension of our history, in which several prominent figures appear with origin in this land.

    Realizar un breve percorrido pola historia, xenealoxía e heráldica dos antigos liñaxes fidalgos da terra de Rodeiro desde a Idade Media é o obxectivo que finalmente se pretende. A evolución que comeza nas fortalezas medievais e continúa en torres de transición, remata nas residencias típicas da fidalguía, das que Trasulfe é o mellor expoñente. Na súa breve extensión o artigo tentará servir de guía ou iniciación a estudios máis detallados, necesarios para a comprensión da nosa historia, na que aparecen varios persoeiros con orixe nesta terra.

  17. MULTIMODALIDADE E A CONSTRUÇÃO DA IDENTIDADE DO SEM-TERRA

    Directory of Open Access Journals (Sweden)

    Vanderleiidalice J. Zacchi

    2009-12-01

    Full Text Available RESUMO: O objetivo deste trabalho é analisar a maneira como o movimento dos Trabalhadores Rurais Sem Terra (mST utiliza os diferentesmodos de produçãode significado e como, nesse processo, é construída sua identidade. A análise será efetuada principalmente a partir de textos impressos, digitais e eletrônicos produzidos pelos sem-terra. Apesar de fazer bom uso das diversas habilidades pressupostas na multimodalidade, o movimento ainda se apoia fortemente no modo linguístico tanto na autorrepresentação quanto na ação social. PALAVRAS-CHAVE: multiletramento, mST, identidade, Internet, mídia. ABSTRACT: This paper aims at analysing the identity construction of the Landless Rural Workers movement (mST by making use of different modes of meaning-construction. The data provided for analysis are based especially on printed, electronic, and digital texts produced by the movement. Although the mST uses multimodal texts extensively, it still relies heavily on the linguistic mode when engaging in both self-representation and social action. KEYWORDS: multiliteracies, landless movement, identity, Internet, media.

  18. Conflicto gerado por la designación de enfermeras para la dirección hospitalaria: una visión periodística Conflito gerado pela designação de enfermeiras para direção hospitalar: uma visão jornalística The conflict generated by the designation of nurses as head directors of hospitals: a journalistic point of view

    Directory of Open Access Journals (Sweden)

    Danelia Gómez Torres

    2008-03-01

    Full Text Available El articulo de investigación, presenta un conflito de transcendencia nacional, generado por la designación de Enfermeras como directoras de hospitales públicos, en dos Instituciones Chilenas en la visión de los periodistas. Tiene por objetivos realizar un análisis crítico del impacto político-social de la toma de poder de las enfermeras durante la gestión hospitalaria, y discutir las intervenciones de los diferentes grupos, basado en una reflexión científica del poder, presentando las posiciones políticas laborales de los diferentes actores sociales en la opinión de los periodistas; Justificándose la investigación por la magnitud del problema en estudio. Señalando que este conflicto es ilustrativo de los problemas reales que afectan al sistema de administración pública. Ratificando así el corporativismo médico, que presiona permanentemente para mantener el poder de los hospitales públicos en manos de sus miembros, manifestando reacciones de rechazo al ingreso de otras de profesiones en la función directiva.O artigo de pesquisa apresenta um conflito de transcendência nacional gerado pela designação de enfermeiras para diretoras de hospitais públicos em duas instituições chilenas, na visão dos jornalistas. Tem por objetivos realizar uma análise crítica do impacto político-social da tomada de poder das enfermeiras durante a gestão hospitalar e discutir as intervenções dos diferentes grupos com base numa reflexão científica do poder, apresentando as posições políticas trabalhistas dos diferentes atores sociais na opinião dos jornalistas. Justifica-se a pesquisa pela magnitude do problema em estudo. Assinalamos que este conflito é ilustrativo dos problemas reais que afetam o sistema de administração pública de saúde, ratificando, assim, o corporativismo do grupo médico que pressiona permanentemente para manter o poder dos hospitais públicos em mãos de seus membros, manifestando reações da n

  19. Simulations with COSMO-CLM over Turin including TERRA-URB parameterization

    Science.gov (United States)

    Bucchignani, Edoardo; Mercogliano, Paola; Milelli, Massimo; Raffa, Mario

    2017-04-01

    The increase of built surfaces constitutes the main reason for the formation of Urban Heat Islands (UHIs), since urban canyons block the release of the reflected radiation. The main contribution to the formation of UHIs is the missing night-cooling of horizontal surfaces, together with cloudless sky and light winds. Of course, there is also a contribution from indoor heating, vehicles presence, and waste heat from air conditioning and refrigeration systems. The COSMO-CLM model, even at high resolution, is currently not able to cope with this effect. Nevertheless, the increase of applications in which a high number of grid points is located over urban areas, requires that COSMO-CLM becomes able to take into account also urban climate features. In fact, they are crucial for better forecast of temperature and for a better characterization of the local patterns of several atmospherical variables (wind, surface fluxes). Recently TERRA-URB, a bulk parameterisation scheme with a prescribed anthropogenic heat flux, has been incorporated into COSMO-CLM for the standard land-surface module TERRA-ML. It offers an intrinsic representation of the urban physics with modifications of input data, soil module and land atmospheric interactions. In the first half of July 2015, Piemonte region and Turin in particular experienced extreme temperature values and uncomfortable conditions for the population. In Turin, the maximum temperature since 1990 (38.5°) has been recorded in July 2015. Ground stations data highlighted the presence of a UHI effect over Turin. This is the reason why this area and this period represent a suitable benchmark to test the capabilities of COSMO-CLM, and in particular of the urban parameterization. The computational domain considered is centered over Turin, discretized with 100 x 100 grid-points, employing a spatial resolution of 0.009° (about 1 km). The ECMWF IFS analysis at 0.075° have been used as forcing data. Two simulations have been performed over

  20. Análise da estrutura de comunidades arbóreas de uma floresta amazônica de Terra Firme aplicada ao manejo florestal Analysis of the structure of tree communities of a amazonian forest applied to management

    Directory of Open Access Journals (Sweden)

    João Carlos Zenaide Oliveira Alves

    2008-12-01

    Full Text Available Este trabalho teve o objetivo de identificar e descrever a estrutura das comunidades arbóreas de uma floresta de terra firme sob regime de manejo na Amazônia Oriental, localizada no município de Almeirim, Pará, Brasil. O levantamento florístico foi realizado em 1.400,30 ha de uma Unidade de Produção Anual (UPA, do Plano de Manejo Florestal da empresa ORSA Florestal. Todos os indivíduos com DAP > 30 cm foram inventariados, registrando-se 77.834 árvores distribuídas em 57 famílias, 229 gêneros e 556 espécies. Oito comunidades foram identificadas por meio de uma analise de agrupamento, apresentando alta diversidade e equibilidade florística (H" médio = 4,25 e J" médio = 0,75. As comunidades apresentaram 138 espécies comuns, 119 espécies de ocorrência exclusiva e 377 espécies raras, representadas por apenas um indivíduo. As espécies que mais se destacaram foram: Dinizia excelsa, Vouacapoua americana, Goupia glabra, Mouriri brachyanthera, Parinari excelsa, Manilkara bidentada, Tachigalia mymecophyla e Licania micrantha. Algumas espécies de valor comercial apresentaram variações importantes na densidade, sugerindo risco de extinção em comunidades onde as espécies apresentam densidade muito baixa. Sugerimos que os planos de manejo considerem as várias comunidades ecológicas encontradas nas UPAs evitando assim variações significativas, causadas pela exploração e seus impactos, na composição florística e estrutura das comunidades existentes.To demonstrate the importance of the ecological concept for forest management, the object of this work was to identify and describe the structure of tree communities of a tropical forest under management in the Eastern Amazonia, located in Almeirim municipality, in the state of Pará, Brazil. The floristic survey was undertaken in a terra-firme tropical forest of 1,400.30 hectares. All individuals with DBH > 30 cm were inventoried, registering 77,834 trees distributed in 57

  1. Development and characterization of ceramic composites based on alumina-titania reinforced with rare earth oxide (holmium oxide) for the production of inert coatings in metal tanks of petroleum industry; Desenvolvimento e caracterizacao de compositos ceramicos baseados em alumina-titania reforcados com oxido de terra rara (oxido de holmio) para fabricacao de revestimentos inertes em tanques metalicos da industria petrolifera

    Energy Technology Data Exchange (ETDEWEB)

    Silva, N.D.G.; Pontual, J.O.; Ferreira, R.A.S.; Yadava, Y.P., E-mail: nokaa_demery@hotmail.com, E-mail: yadava@ufpe.br [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Departamento de Engenharia Mecanica

    2014-07-01

    Due to the importance of petroleum and its derivatives for modern society, it is necessary to develop technologies that improve processes and transports of petroleum. The crude oil creates hostile environments and in the process of transport and storage of petroleum are used metallic materials, which corrode becoming a critical problem in this industry. One way of solving this problem is the use of ceramics based on alumina as inert coating on hostile environments. In this work was studied a structure, microstructure and mechanical properties of ceramic composite based on Al2O3 - TiO2 reinforced Ho2O3. The composites were produced by a thermomechanical process, sintered at 1350°C, were analyzed by x-ray diffraction, optical microscopy, scanning electron microscopy, and microhardness. Analyses were performed before and after immersion in earth and offshore crude petroleum to study stability of the developed composites and concluded that the ceramic composites immersed in petroleum show stable in hostile environments. (author)

  2. Development of a methodology for the separation of europium and samarium from a mixture of rare earth oxides by electroreduction/ precipitation; Desenvolvimento de uma metodologia para a separacao de samario e europio a partir de mistura de oxidos de terras raras por reducao eletroquimica/precipitacao

    Energy Technology Data Exchange (ETDEWEB)

    Chepcanoff, Vera

    2006-07-01

    The rare earths (RE) were first used in 1903, when Welsbach developed a lighter that is still used today. Nowadays, the RE are employed in many different fields, as in the production of super-alloys , as catalysts for petroleum industry, in the manufacture of non-ferrous alloys, color television tubes, x-ray screens, special glasses, ceramics, computer industries, nuclear medicine, lasers, pigments, etc., moving, in the last decade , a market of US$ 2 billions per year. Due to their similar properties, the RE elements are very difficult to separate, requiring complex processes, what make the products very expensive. Elements like Eu and Sm, which contents in the minerals are low (0.05% and 2.0%, respectively, in monazite) are extremely expensive, but their field of application justifies the research for looking for other processes, more simple and/or more effective. Trivalent state is a characteristic of all RE, but some of them presents oxidation state +2, like Ce, Eu, Sm and Yb. In the case of Eu and Sm, the focus of the present work, the divalent state is achieved by electro-reduction in the potentials -0.65 and -1.55 (SCE), respectively. This makes possible the separation of these elements from the other rare earths and from each other. Thus, making use of this characteristic, a process for the individual separation of Eu and Sm in (NH{sub 4}){sub 2}SO{sub 4} solution by electro-reduction/precipitation is proposed, where Sm is first separated from the solution as sulfate, and Eu, that remains in the solution, is precipitated after the decrease of temperature and potential applied. The process developed from a synthetic Eu and Sm solution was applied to a mixture of semi-heavy RE oxide, produced at IPEN-CNEN/SP, obtaining the separation of Sm. This product was analyzed by spectrophotometry, showing high purity. (author)

  3. Evaluation of the concentration of toxic metals and rare ground elements in samples of sediments of the Billings and Guarapiranga systems reservoirs; Avaliacao da concentracao de metais e elementos terras raras em amostras de sedimentos dos reservatorios dos sistemas Billings e Guarapiranga

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Larissa de Souza

    2017-11-01

    The excessive urbanization process of the Sao Paulo Metropolitan Region resulted in the loss of the natural characteristics of its water courses causing serious changes in flow and quality regimes. The objective of this study was evaluate the concentration of toxic metals, semi metals As, Sb and Se, and rare earth elements present in surface sediment samples collected at the Billings, Guarapiranga and Rio Grande Reservoirs. The Ag, Al, As, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni, Pb, Sb, Se and Zn elements were analyzed using Optical Emission Spectrometry With Inductively Coupled Plasma (ICP OES). Some major, trace and rare earth elements (Ce, Eu, La, Lu, Nd, Sm, Tb and Yb) were analyzed by the Instrumental Neutron Activation Analysis (INAA) technique. The total Hg concentration was determined by Cold Vapor Atomic Absorption Spectrometry technique (CVAAS). The validation of the methodologies was performed by means of the certified reference material analyses. To assess the sources of anthropogenic contamination, the enrichment factor (EF) and the geoaccumulation index (IGeo) were calculated. The results obtained for both techniques were compared with TEL and PEL oriented values established by CCME (Canadian Council of Ministers of the Environment) and adopted by CETESB (Environmental Company of the Sao Paulo State). All sampling points showed concentration values for toxic metals >TEL and 2 points at Billings Reservoir (BILL02030 and 02100), values > PEL for As, Cr, Cu, Hg, Ni, Pb and Zn, probably due to the entrance of the Pinheiros River waters and drainage basins of the Cocaia and Borore streams. The calculated EF and IGeo values indicated possible anthropogenic contamination for Sb and Se for the elements determined by ICP OES and As, Cr, Sb and Zn, obtained by INAA. The Billings reservoir presented, in general, the highest concentrations for the analyzed elements, indicating a poor quality of its sediments. This study confirms the need of a frequent monitoring of the sediment quality in the studied reservoirs as an indispensable procedure for periodic evaluation of the basin quality, considering its importance in the water supply for the Metropolitan Region of Sao Paulo. (author)

  4. Optical and structural characterization of the pure and doped BaY{sub 2}F{sub 8} with rare earths for application in radiation detectors and scintillators; Caracterizacao optica e estrutural do BaY{sub 2}F{sub 8} puro e dopado com terras raras visando aplicacao em detectores de radiacao e cintiladores

    Energy Technology Data Exchange (ETDEWEB)

    Mello, Ana Carolina Santana de

    2008-07-01

    In this work Barium Yttrium Fluoride (BaY{sub 2}F{sub 8} -BaYF) doped with different concentrations of ions Tb{sup 3+}, Er{sup 3+}, Tm{sup 3+} e Nd{sup 3+} were characterized, aiming the application in radiation detection devices that use the scintillating properties. Two types of samples were produced in the CLA-IPEN-SP, polycrystalline samples, obtained via solid state reaction of BaF{sub 2} and YF{sub 3} under HF atmosphere, and single crystals, obtained via the zone melting method also in a HF atmosphere. The samples were characterized using the following experimental techniques: X-ray powder diffraction, Radioluminescence (RL), Optical Absorption and Dispersive X-ray Absorption Spectroscopy (DXAS). The X-ray diffraction pattern showed the presence of the phase BaY{sub 2}F{sub 8} and a small amount of the phase Ba{sub 4}Y{sub 3}F{sub 17} in the polycrystalline pure and Tb{sup 3+}doped samples. The other samples showed only the desired BaY{sub 2}F{sub 8} phase. The radioluminescence measurements of the doped BaYF, when irradiated with X-rays, showed emission peaks in energies that are characteristics of the 4f-4f transitions of rare earths. The RL of the samples with 2 mol por cent and 3 mold of Tb{sup 3+}showed quite intense peaks with a maximum emission peak at 545 nm. The Tm{sup 3+}doped BYF showed that the scintillation efficiency is not directly proportional to the doping level, and the highest RL emission were obtained for the polycrystalline samples doped with 1 mol por cent, showing a maximum peak intensity at 456 nm (the blue region of the visible spectrum). All samples showed a phosphorescent decay time of the order of seconds. Single crystals of BaYF doped with 2 mol por cent of Er{sup 3+}, in addition to one of the highest phosphorescence time, presents a quite strong Rl in the green region of the spectra. The radiation damage was evaluated by the optical absorption techniques and the results showed that the formation of the absorption bands can be connected to colors centers generated by radiation in the matrix. Measurements of DXAS, done at the LNLS DXAS beamline, revealed that there is no change in the absorption edge of the dopant during irradiation. Among ali samples, the Nd{sup 3+} ones presented the lowest scintillation efficiency with maximum emissions in the infrared region. (author)

  5. Study of the hyperfine magnetic field acting on Ce probes substituting for the rare earth and the magnetic ordering in intermetallic compounds RAg (R=rare earth) by first principles calculations; Estudo do campo hiperfino magnetico na sonda de Ce colocada nos compostos intermetalicos do tipo RAg (R=terra rara) e do ordenamento magnetico desses compostos usando calculos de primeiros principios

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Luciano Fabricio Dias

    2006-07-01

    In this work the magnetic hyperfine field acting on Ce atoms substituting the rare-earths in R Ag compounds (R = Gd e Nd) was studied by means of first-principles electronic structure calculations. The employed method was the Augmented Plane Waves plus local orbitals (APW+lo), embodied in the WIEN2k program, within the framework of the Density Functional Theory (DFT) and with the Generalized Gradient Approximation (GGA) for the exchange and correlation potential. The super-cell approach was utilized in order to simulate for the Ce atoms acting as impurities in the R Ag matrix. In order to improve for correlation effects within the 4f shells, a Hubbard term was added to the DFT Hamiltonian, within a procedure called GGA+U. It was found that the magnetic hyperfine field (MHF) generated by the Ce 4f electron is the main component of the total MHF and that the Ce 4f ground state level is probably a combination of the m{sub l} = -2 and m{sub l} = -1 sub-levels. In addition, the ground-state magnetic structure was determined for Ho Ag and Nd Ag by observing the behavior of the total energy as a function of the lattice volume for several possible magnetic ordering in these compounds, namely, ferromagnetic, and the (0,0,{pi}), ({pi},{pi},0) and (({pi},{pi},{pi}) types of anti-ferromagnetic ordering of rare-earth atoms. It was found that the ground-state magnetic structure is anti-ferromagnetic of type ({pi},{pi},0) for both, the Ho Ag and Nd Ag compounds. The energy difference of the ferromagnetic and antiferromagnetic ordering is very small in the case of the Nd Ag compound. (author)

  6. Rare earths: preparation of spectro chemically pure standards, study of their carbonates and synthesis of a new compound series - the peroxy carbonates; Terras-raras: obtencao de padroes espectroquimicos, estudo dos carbonatos e sintese dos peroxicarbonatos. Uma nova serie de compostos

    Energy Technology Data Exchange (ETDEWEB)

    Queiroz, Carlos Alberto da Silva

    1996-05-01

    In this work the following studies are concerned: I) preparation of lanthanum, cerium, praseodymium, neodymium and samarium oxides for use as spectro chemically pure standards; II) behavior of the rare earth (La, Ce, Pr, Nd, Sm) carbonates soluble in ammonium carbonate and mixture of ammonium carbonate/ammonium hydroxide, and III) synthesis and characterization of rare earth peroxy carbonates - a new series of compounds. Data for the synthesis and characterization of the rare earths peroxy carbonates described for the first time in this work are presented and discussed. With the aid of thermal analysis (TG-DTG) the thermal stability and the stoichiometric composition for new compounds were established and a mechanism of thermal decomposition was proposed. The peroxy carbonate was prepared by the addition of hydrogen peroxyde to the complexed soluble rare earths carbonates. These studies included also the determinations of active oxygen, the total rare earth oxide by gravimetry and complexometry and the C, H and N contents by microanalysis. The new compounds were also investigated by infrared spectroscopy. (author)

  7. Study of amorphous semiconductors doped with rare earths (Gd and Er) and conducting polymers by EPR techniques and magnetic susceptibility; Estudo de semicondutores amorfos dopados com terras raras (Gd e Er) e de polimeros condutores atraves das tecnicas de RPE e susceptibilidade magnetica

    Energy Technology Data Exchange (ETDEWEB)

    Sercheli, Mauricio da Silva

    1999-07-01

    This thesis involves the study of amorphous semiconductors and conducting polymers, which have been characterized by EPR and magnetic susceptibility measurements, and to a lesser extent by Raman spectroscopy and RBS. The semiconductors were studied using thin films of silicon doped with rare earth metals, e.g. erbium and gadolinium, which had their magnetic properties studied. Using these studies we could determine the state of valence of the rare earths as well as their concentrations in the silicon matrix. According to our results, the valence of the rare earth metal ions is 3+, and we were able to conclude that 4f electronic shells could not be used for the calculation of the conducting band in this system. Furthermore, the analysis of the data on the magnetic susceptibility of the Er{sup 3+} ion with cubic crystalline acting field, gave us the opportunity to estimate the overall splitting of their electronic states for the first time. The conducting polymers were studied using samples of poly(3-methylthiophene) doped with ClO{sub 4}{sup -}, which show a phase transition in the range of 230 K to 130 K. The electron paramagnetic resonance also gives important information on the crystallization, doping level and the presence of polarons or bipolarons in conducting polymers. (author)

  8. Growth and characterization of fluoride monocrystalline fibres of the type LiY{sub 1-x} RE{sub x}F{sub 4} (RE=rare-earths); Crescimento e caracterizacao de fibras monocristalinas de fluoretos do tipo LiY{sub 1-x} TR{sub x}F{sub 4} (TR=terras raras)

    Energy Technology Data Exchange (ETDEWEB)

    Espirito Santo, Ana Maria do

    2005-07-01

    In this work we present the growth and characterization of LiF pure and rare-earth doped (Er and Nd) yttrium-lithium tetra-fluoride (LiYF{sub 4} or YLF) by the micropulling- down technique (muPD). The use of this technique is original for the present purpose. A mu-PD prototype in the resistive mode was firstly built to understand the most important operational parameters. A commercial equipment was later installed and specifically modified to grow fluoride fibres. Regular and transparent single-crystalline fibres of LiF (diameter of 0.6 mm and length up to 150 mm) were obtained. LiF crystalline fibres as a potential laser media presented the same spectroscopic properties of bulk crystals. The influence of capillary and crucible shapes, growth atmosphere and start composition stoichiometry on the growth process of YLF fibers were also investigated. In general, the fluorides are very sensitive to moisture contamination. The growth atmosphere plays an important role on the stoichiometry deviation. Since this fluoride melts incongruently, any compositional changes influences the solidification behavior of the material. Additionally, a limited pulling rate is required to the YLF phase formation and to the compositional homogeneity along the fiber. Homogeneous and regular section YLF fibres, with diameters between 0.5 to 0.8 mm and up to 60 mm in length, were obtained in a suitable and reproducible growth process. Er-doped (with nominal concentration of 10 and 40 mol%) and Nd-doped (with nominal concentration of 1.7 mol%) fibres were also successfully grown. Er-doped fibres were crack-free and the dopant concentration was practically uniform along the YLF phase. However, Nd-doped fibres presented a short initial transient in its concentration. The Nd distribution coefficient was evaluated as 0.58 for the YLF fibre. This value is greater than those estimated for YLF bulk crystals grown by normal freezing processes. The optical properties of the YLF:Nd fibres were similar to those observed in bulk crystals, which drive to consider the YLF:Nd fibres as an important material to build compact all-solid-state lasers directly pumped by diodes. (author)

  9. Hydrometallurgical method for recycling rare earth metals, cobalt, nickel, iron, and manganese from negative electrodes of spent Ni-MH mobile phone batteries; Metodo hidrometalurgico para reciclagem de metais terras raras, cobalto, niquel, ferro e manganes de eletrodos negativos de baterias exauridas de Ni-MH de telefone celular

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Vinicius Emmanuel de Oliveira dos; Lelis, Maria de Fatima Fontes; Freitas, Marcos Benedito Jose Geraldo de, E-mail: viniciusemmanuel@hotmail.com [Universidade Federal do Espirito Santo (UFES), Vitoria, ES (Brazil). Departamento de Quimica; Celante, Vinicius Guilherme [Instituto Federal do Espirito Santo (IFES), Aracruz, ES (Brazil)

    2014-07-01

    A hydrometallurgical method for the recovery of rare earth metals, cobalt, nickel, iron, and manganese from the negative electrodes of spent Ni-MH mobile phone batteries was developed. The rare earth compounds were obtained by chemical precipitation at pH 1.5, with sodium cerium sulfate (NaCe(SO{sub 4}){sub 2}.H{sub 2}O) and lanthanum sulfate (La{sub 2}(SO{sub 4}){sub 3}.H{sub 2}O) as the major recovered components. Iron was recovered as Fe(OH){sub 3} and FeO. Manganese was obtained as Mn{sub 3}O{sub 4}.The recovered Ni(OH){sub 2} and Co(OH){sub 2} were subsequently used to synthesize LiCoO{sub 2}, LiNiO{sub 2} and CoO, for use as cathodes in ion-Li batteries. The anodes and recycled materials were characterized by analytical techniques. (author)

  10. Sintering of Si C by hot-pressing with addition of Al{sub 2}O{sub 3} and concentrate of rare earths; Sinterizacao por prensagem a quente com SiC com adicao de Al{sub 2}O{sub 3} e concentrado de terras raras

    Energy Technology Data Exchange (ETDEWEB)

    Hwang, M.K.; Silva, C.R.M. [Centro Tecnico Aeroespacial (CTA-IAE), Sao Jose dos Campos, SP (Brazil). Inst. de Atividades Espaciais]. E-mail: miriamk@iae.cta.br; Nono, M.C.A.; Vieira, R.A. [Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP (Brazil)

    2004-07-01

    Silicon carbide (SiC) has essentially covalent bonds ({approx}88%). The high covalency bond is responsible for the good mechanical properties, although it induces a low self diffusion coefficient, making densification more difficult. For a successful densification is necessary to apply pressure on the samples, and/or the addition of sintering additives, which improves the densification. In this SiC samples with alumina (Al2O3) and concentrate of rare earth (CRE) addition were sintered by hot pressing in argon atmospheric at 20 MPa of pressure, heating rate of 20 deg C/min up to 1800 deg C and a dwell time of 1 h. Initially the CRE was calcined at 1000 deg C during 1 h. After that, three mixtures were prepared with distinct concentrations in high energy mill and the samples were sintered. The aim of this work is to improve SiC densification by the liquid phase formation during sintering owing to the additives reactions between itself. The pressure intensify the driving force for densification, taking the liquid phase to drain easier through the grain boundaries, making possible best accommodation and rearrangement of the grains. The application of the pressure on the samples during sintering contributes to improve densification and becomes possible sintering in lower temperature than conventional one. The phases of the sintered samples were analyzed by X-ray diffraction and the morphology were verified by scanning electron microscopy. (author)

  11. "Estudo do campo hiperfino magnético na sonda de Ce colocada nos compostos intermetálicos do tipo RAg (R=Terra Rara) e do ordenamento magnético desses compostos usando cálculos de primeiros princípios"

    OpenAIRE

    Luciano Fabricio Dias Pereira

    2006-01-01

    Nesse trabalho foram estudados os compostos intermetalicos do tipo RAg (R = Nd, Gd e Ho) por calculos teoricos desenvolvidos dentro do formalismo da Teoria do Funcional Densidade (DFT). O metodo APW+lo (Augmented Planes Waves + lo- cal orbitals) foi aplicado para resolver a equacao de Kohn-Sham e a Aproximacao do Gradiente Generalizado (GGA) usada para tratar de forma aproximada o potencial de troca-correlacao. O codigo computacional utilizado foi o WIEN2k. As atividades foram focalizadas em ...

  12. Preparation of Pt Ru/C + rare earths by the method of reduction by alcohol for the electro-oxidation of ethanol; Preparacao de eletrocatalisadores PtRu/C + terras raras pelo metodo da reducao por alcool para a eletro-oxidacao do etanol

    Energy Technology Data Exchange (ETDEWEB)

    Tusi, M.M.; Rodrigues, R.M.S.; Spinace, E.V.; Oliveira Neto, A., E-mail: aolivei@ipen.b, E-mail: espinace@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2010-07-01

    PtRu/C electrocatalyst was prepared in a single step, while that PtRu/85%C-15%Ce, PtRu/85%C-15%La, PtRu/85%C-15%Nd and PtRu/85%C-15%Er electrocatalyst were prepared in a two step. In the first step a Carbon Vulcan XC72 + rare earth supports were prepared. In the second step PtRu electrocatalyst were prepared by an alcohol-reduction process using ethylene glycol as solvent and reducing agent and supported on Vulcan XC72 + earth rare. The obtained electrocatalysts were characterized by EDAX, XRD and chronoamperometry. The electro-oxidation of ethanol was studied by chronoamperometry at room temperature. PtRu/85%C- 15%Ce electrocatalyst showed a significant increase of performance for ethanol oxidation compared to PtRu/C electrocatalyst. (author)

  13. ANÁLISE TEÓRICA SOBRE A INFLUÊNCIA DA ESTRUTURA ELETRÔNICA NAS PROPRIEDADES MAGNÉTICAS DOS ELEMENTOS TERRAS-RARAS/THEORETICAL ANALYSIS OF THE INFLUENCE OF ELECTRONIC STRUCTURE ON MAGNETIC PROPERTIES OF RARE-EARTH ELEMENTS

    National Research Council Canada - National Science Library

    F H S Sales; F S H T Pinheiro

    2013-01-01

    .... Nanomagnetic systems involving artificial nanolayers of Dy and Ho have been studied extensively in recent years, due mainly to the exotic magnetic phases presented by these materials, favoring...

  14. ANÁLISE TEÓRICA SOBRE A INFLUÊNCIA DA ESTRUTURA ELETRÔNICA NAS PROPRIEDADES MAGNÉTICAS DOS ELEMENTOS TERRAS-RARAS/THEORETICAL ANALYSIS OF THE INFLUENCE OF ELECTRONIC STRUCTURE ON MAGNETIC PROPERTIES OF RARE-EARTH ELEMENTS

    National Research Council Canada - National Science Library

    F H S Sales; F S H T Pinheiro

    2013-01-01

    ...) from the electronic structure of these elements. The unpaired electrons in the 4f orbitals give rise magnetism of the TR, so that they present high values of magnetic moment, compared to other chemicals...

  15. Study of the oxygen reduction reaction using Pt-Rare earths (La, Ce, Er) electrocatalysts for application of PEM fuel cells; Estudo da reacao de reducao do oxigenio utilizando eletrocatalisadores a base de Pt-terras raras (La, Ce, Er) para aplicacao em celulas a combustivel tipo PEM

    Energy Technology Data Exchange (ETDEWEB)

    Gomes, Thiago Bueno

    2013-07-01

    The complexity of the oxygen reduction reaction (ORR) and its potential losses make it responsible for the most part of efficiency losses at the Fuel Cells. For this reaction the electrocatalyst witch is most appropriated and shows better performance is platinum, a noble metal that elevates the cost, raising barriers for Fuel Cells technology to enter the market. First this work focuses on reducing the amount of platinum used in the cathode, by being replaced by rare earths. The most common methods of synthesis involves a large amount of steps and this work proposed to prepare the electrocatalyst through a simpler way that would not take so many steps and time to be done. Using an ultrasound mixer the electrocatalyst was prepared mixing platinum supported on carbon black and the rare earths lanthanum, cerium and erbium oxides to be applied in a half-cell study of the ORR. The Koutecky-Levich plots shows that among the electrocatalysts prepared the Pt80Ce20/C had the catalytic activity close to the commercial BASF platinum on carbon black, suggesting that the reaction was taken by the 4-electron path. As found in some works in literature, among the rare earth used to study the ORR, cerium is the one witch shows the better performance because it is able to store and provide oxygen. This feature is of great interest for the ORR because this reaction is first order to the oxygen concentration. Results show that is possible to reduce the amount of platinum maintaining the same electrocatalyst activity. (author)

  16. Influence of Y, Gd and Sm on the glass forming ability and thermal crystallization of aluminum based alloy; Efeito das terras raras Y, Gd e Sm na tendencia a formacao de amorfo e na cristalizacao termica em ligas a base de aluminio

    Energy Technology Data Exchange (ETDEWEB)

    Aliaga, L.C.R.; Bolfarini, C.; Kiminami, C.S.; Botta Filho, W.J., E-mail: aliaga@ufscar.b [Universidade Federal de Sao Carlos (DEMa/UFSCar), SP (Brazil). Dept. de Engenharia de Materiais; Danez, G.P. [Universidade Federal de Sao Carlos (PPG-CEMUFSCar), SP (Brazil). Programa de Pos-Graduacao em Ciencia e Engenharia de Materiais

    2010-07-01

    Al-based amorphous alloys represent an important family of metals and a great scientific activity has been devoted to determine the main features of both glass forming ability (GFA) and crystallization behavior in order to have a comprehensive framework aimed at potential technological applications. Nowadays, it is well known that the best Al-based amorphous alloys are formed in ternary systems such as Al- RE-TM, where RE is a rare earth and TM a transition metal. This paper presents results of research in Al{sub 85}Ni{sub 10}RE{sub 5} alloys (RE = Y, Gd and Sm). Amorphous ribbons were processed by melt-spinning under the same conditions and subsequently characterized by x-ray diffraction (XRD) and differential scanning calorimetry (DSC). Results show appreciable micro structural differences as function of the rare earth, thus crystal is obtained for Y, nano-glassy for Gd and, fully amorphous structure for Sm. (author)

  17. Development of electrolytic process in molten salt media for light rare-earth metals production. The metallic cerium electrodeposition; Desenvolvimento de processo de eletrolise em meio de sais fundidos para a producao de metais de terras-raras leves. A obtencao do cerio metalico

    Energy Technology Data Exchange (ETDEWEB)

    Restivo, T.A.G.

    1994-12-31

    The development of molten salt process and the respective equipment aiming rare-earth metals recovery was described. In the present case, the liquid cerium metal electrodeposition in a molten electrolytes of cerium chloride and an equimolar mixture of sodium and potassium chlorides in temperatures near 800{sup C} was studied. Due the high chemical reactivity of the rare-earth metals in the liquid state and their molten halides, an electrolytic cell was constructed with controlled atmosphere, graphite crucibles and anodes and a tungsten cathode. The electrolytic process variables and characteristics were evaluated upon the current efficiency and metallic product purity. Based on this evaluations, were suggested some alterations on the electrolytic reactor design and upon the process parameters. (author). 90 refs, 37 figs, 20 tabs.

  18. Análisis bibliométrico de la influencia de la Genética en enfermedades raras, a partir de las bases de datos Pubmed y SCI (2000-2009

    Directory of Open Access Journals (Sweden)

    Serrano-López, Antonio Eleazar

    2013-12-01

    Full Text Available This work focuses on the bibliometric analysis of journal articles published about two rare diseases that produce mental and behavioural disorders: Rett Syndrome and CADASIL, during the period 2000-2009. Furthermore, although Rett mainly affects females and the causes of both diseases are very different, they have in common that both are genetic disorders. To carry out the analysis we used two databases, Medline and SCI --each with its advantages and biases but complementary to each other-- together with a multidimensional analysis methodology in order to determine the relationship between output about these rare diseases and the advances in the field of Genetics. The results show a clear difference in research patterns for the two diseases, but a convergence on a common factor, genetic influence, although this is more pronounced in the Rett syndrome. Finally it concludes that the great milestones in the field of genetics, both specific (mutations in genes that cause disease and general (the human genome sequencing, significantly affect the scientific activity surrounding these rare diseases.Este trabajo se centra en el análisis bibliométrico de los artículos de revista publicados sobre dos enfermedades raras que generan trastornos mentales y del comportamiento: CADASIL y Síndrome de Rett, durante el periodo 2000- 2009. Además, aunque el Rett afecta fundamentalmente al género femenino y las causas de ambas enfermedades son muy diferentes, tienen en común que en ambos casos se trata de trastornos con un origen genético. Para llevar a cabo el análisis se utilizaron dos bases de datos, Medline y SCI y una metodología de análisis multidimensional que permitiera determinar la relación existente entre la producción en estas enfermedades raras y los avances en el campo de la Genética. Los resultados encontrados muestran una clara diferenciación en los patrones de investigación en ambas enfermedades, aunque confluyen en un factor com

  19. Los cócs: una seña de identidad de la Terra Alta

    Directory of Open Access Journals (Sweden)

    Maria Del Loreto Meix

    2004-04-01

    Full Text Available Este artículo trata sobre la repostería tradicional de la comarca de la Terra Alta (Cataluña vinculada a las fiestas, especialmente sobre las pastas que se suelen hacer en dicha comarca. En esta zona las pastas se llaman cócs, una palabra que está presente tanto en la Terra Alta como en las comarcas vecinas de la Ribera d'Ebre o el Priorat. Junto con las pastas se sirve el vino rancio, la mistela o el vino dulce, que también son productos de estas tierras. Actualmente, panaderías y pastelerías de los pueblos de la comarca elaboran estos productos tradicionales artesanos, que en otras épocas sólo se hacían en casa.El artículo, que nace del trabajo de final de carrera realizado por la autora para la licenciatura de Humanidades de la UOC, aporta una visión privilegiada de la riqueza de la Terra Alta con respecto a su historia gastronómica, sus costumbres y la manera de tratar sus dulces. La autora, que ya había trabajado anteriormente en estos aspectos, sitúa las especificidades de la repostería tradicional terraltina en el contexto de las culturas mediterráneas con raíces comunes que se remontan al mundo antiguo y medieval y que todavía mantienen un "aire de familia" bien identificable; a la vez, recorre por la zona, con interés etnográfico, lo que denomina "el mundo del trigo" (la amasadura del pan, el oficio de panadero, los hornos y otras herramientas, las tradiciones asociadas.... En definitiva, rescata un aspecto vivo de la cotidianidad local y lo sitúa a la luz de la historia de la alimentación, mientras aporta información que puede ser de interés desde otros ángulos de estudio.

  20. Ambiente institucional e compra de terras por estrangeiros em países em desenvolvimento

    Directory of Open Access Journals (Sweden)

    Leandro Simões Pongeluppe

    2014-03-01

    Full Text Available De acordo com o Banco Mundial, desde o final dos anos 2000 o movimento de aquisição de terras por estrangeiros tem se acentuado nos países em desenvolvimento, impulsionado pelo boom dos preços das commodities. Em termos teóricos, a abordagem da Nova Economia Institucional (NEI argumenta que as instituições são importantes para as estratégias dos agentes econômicos e seu desempenho. Neste estudo, apoiado na NEI, pretende-se responder como as instituições presentes em países periféricos refletem o processo de aquisições de terras por investidores estrangeiros. Para esse objetivo, foram utilizados dados secundários de organizações internacionais, como Food and Agriculture Organization, Banco Mundial, Conferência das Nações Unidas sobre Comércio e Desenvolvimento, Fundo Monetário Internacional, Organização para a Cooperação Econômica e Desenvolvimento Econômico, Wall Street Journal e agências nacionais. A hipótese principal é que a força ou a fraqueza presente no ambiente institucional em países em desenvolvimento tem influência relevante no nível de Investimento Estrangeiro Direto (IED. Para testar a hipótese, adota-se como metodologia a análise estatística, na qual se verifica a relação entre o nível de IED nos países receptores (variável dependente contra variáveis independentes: liberdade de investimento, direitos de propriedade e nível de corrupção. Espera-se?que os pa?ses com?ambientes institucionais independentes: liberdade de investimento, direitos de propriedade e nível de corrupção. Espera-se que os países com ambientes institucionais fracos, ou menos seguros, tendam a receber menores investimentos em compra de terras e arrendamentos do que outros países que têm estrutura institucional que garanta os direitos de propriedade.

  1. Multitemporal monitoring of Karviná subsidence troughs using Sentinel-1 and TerraSAR-X interferometry

    Czech Academy of Sciences Publication Activity Database

    Lazecký, M.; Jiránková, E.; Kadlečík, Pavel

    2017-01-01

    Roč. 14, č. 1 (2017), s. 53-59 ISSN 1214-9705 Institutional support: RVO:67985891 Keywords : subsidence * SAR Interferometry * Sentinel-1 * TerraSAR-X * mining Subject RIV: DE - Earth Magnetism, Geodesy, Geography OBOR OECD: Physical geography Impact factor: 0.699, year: 2016 https://www.irsm.cas.cz/index_en.php?page=acta_detail_doi&id=187

  2. Genome sequence of the verrucomicrobium Opitutus terrae PB90-1, an abundant inhabitant of rice paddy soil ecosystems

    NARCIS (Netherlands)

    Passel, van M.W.J.; Vos, de W.M.; Smidt, H.

    2011-01-01

    Bacteria of the deeply branching phylum Verrucomicrobia are rarely cultured yet commonly detected in metagenomic libraries from aquatic, terrestrial, and intestinal environments. We have sequenced the genome of Opitutus terrae PB90-1, a fermentative anaerobe within this phylum, isolated from rice

  3. Rentabilidade Econômica do Arrendamento de Terra para Cultivo de Eucalipto em São Paulo

    Directory of Open Access Journals (Sweden)

    Vanderlei Santos de Souza

    Full Text Available RESUMOO presente estudo teve como objetivo analisar o arrendamento de terra para o cultivo de eucalipto no Vale do Paraíba, São Paulo. Utilizaram-se informações de dez propriedades, sendo oito proprietários da terra, uma empresa de papel e celulose e um investidor em ativos florestais. As ferramentas econômicas utilizadas foram VPL, TIR e VET. Com uma TMA de 8,75% a.a., o cultivo de eucalipto com investimento em terra na região estudada mostrou ser viável economicamente em cinco propriedades. Com a garantia de produtividade estabelecida em contrato, o investimento apresentou viabilidade econômica para o arrendamento de terra, porém inviável para o investidor. A garantia de produtividade mostrou ser importante para manter a rentabilidade para o investidor e para o arrendado pois, sem a mesma, apenas três propriedades apresentaram viabilidade econômica para arrendamento.

  4. MODIS/Terra Land Surface Temperature/3-Band Emissivity 8-Day L3 Global 1km SIN Grid V006

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS/Terra Land Surface Temperature/3-Band Emissivity 8-Day L3 Global 1km SIN Grid (MOD21A2.006). A new suite of MODIS Land Surface Temperature (LST) and Emissivity...

  5. Burkholderia terrae BS001 migrates proficiently with diverse fungal hosts through soil and provides protection from antifungal agents

    NARCIS (Netherlands)

    Nazir, Rashid; Tazetdinova, Diana I.; van Elsas, Jan Dirk

    2014-01-01

    Soil bacteria can benefit from co-occurring soil fungi in respect of the acquisition of carbonaceous nutrients released by fungal hyphae and the access to novel territories in soil. Here, we investigated the capacity of the mycosphere-isolated bacterium Burkholderia terrae BS001 to comigrate through

  6. MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 0.05Deg CMG V005

    Data.gov (United States)

    National Aeronautics and Space Administration — The MODIS/Terra V5 LST/E L3 Global CMG (Short name: MOD11C1) products incorporate 0.05º (5600 meters at the equator) pixels, which are derived from the MOD11B1 daily...

  7. Arsenic Encapsulation Using Portland Cement With Ferrous Sulfate/Lime And Terra-BondTM Technologies - Microcharacterization And Leaching Studies

    Science.gov (United States)

    This work reports the results of an investigation on the treatment and encapsulation of arsenic-containing materials by Portland cement with ferrous sulfate and lime (PFL) and Terra-BondTM, a commercially available patented technology. The arsenic materials treated we...

  8. Increased TERRA levels and RNase H sensitivity are conserved hallmarks of post-senescent survivors in budding yeast.

    Science.gov (United States)

    Misino, Stefano; Bonetti, Diego; Luke-Glaser, Sarah; Luke, Brian

    2018-02-16

    Cancer cells activate telomere maintenance mechanisms (TMMs) to bypass replicative senescence and achieve immortality by either upregulating telomerase or promoting homology-directed repair (HDR) at chromosome ends to maintain telomere length, the latter being referred to as ALT (Alternative Lengthening of Telomeres). In yeast telomerase mutants, the HDR-based repair of telomeres leads to the generation of 'survivors' that escape senescence and divide indefinitely. So far, yeast has proven to provide an accurate model to study the generation and maintenance of telomeres via HDR. Recently, it has been established that up-regulation of the lncRNA, TERRA (telomeric repeat-containing RNA), is a novel hallmark of ALT cells. Moreover, RNA-DNA hybrids are thought to trigger HDR at telomeres in ALT cells to maintain telomere length and function. Here we show that, also in established yeast type II survivors, TERRA levels are increased in an analogous manner to human ALT cells. The elevated TERRA levels are independent of yeast-specific subtelomeric structures, i.e. the presence or absence of Y' repetitive elements. Furthermore, we show that RNase H1 overexpression, which degrades the RNA moiety in RNA-DNA hybrids, impairs the growth of yeast survivors. We suggest that even in terms of TERRA regulation, yeast survivors serve as an accurate model that recapitulates many key features of human ALT cells. Copyright © 2018 International Society of Differentiation. Published by Elsevier B.V. All rights reserved.

  9. Challenges of linking scientific knowledge to river basin management policy: AquaTerra as a case study

    NARCIS (Netherlands)

    Slob, A.; Rijnveld, M.

    2007-01-01

    The EU Project AquaTerra generates knowledge about the river-soil-sediment-groundwater system and delivers scientific information of value for river basin management. In this article, the use and ignorance of scientific knowledge in decision making is explored by a theoretical review. We elaborate

  10. MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 6km SIN Grid V005

    Data.gov (United States)

    National Aeronautics and Space Administration — The MODIS/Terra V5 LST/E L3 Global 1 Km Grid (Short name: MOD11B1) products incorporate 6 km pixels, which are produced daily using the day/night LST algorithm (Wan...

  11. Estructura poblacional y relaciones ambientales del árbol tropical Nectandra rudis (Lauraceae, una especie rara en el occidente de México

    Directory of Open Access Journals (Sweden)

    Ramón Cuevas Guzmán

    2008-03-01

    Full Text Available Nectandra rudis es una especie rara en el occidente de México. Analizamos la población y la comunidad donde se desarrolla, en la Sierra de Manantlan, Jalisco, México. Establecimos cuatro parcelas de 60x48 m con diferencias altitudinales de 100 m entre sí. En cada una seleccionamos aleatoriamente diez círculos de 100 m² cada uno, en los cuales medimos los diámetros normales y las alturas de las especies leñosas con diámetro 2.5 cm. Para cada especie y por parcela determinamos el área basal, la densidad, la frecuencia, la riqueza de especies y los valores de importancia. Establecimos la estructura vertical y diamétrica de N. rudis. Hicimos una ordenación directa con la matriz de especies y las variables edáficas y ambientales. El registro de N. rudis en la Sierra de Manantlán representa el primer registro para el occidente de México y el más septentrional del taxon. La población se estructura en cinco categorías diamétricas y genera una curva en forma de "J" invertida. La riqueza de especies en las parcelas donde se encuentra N. rudis, varía de 27 a 39, y los mayores valores de importancia son para Urera verrucosa, N. rudis y Ficus sp. La ordenación directa permite postular a la presencia de árboles caídos, la cobertura, la profundidad del horizonte superficial y el magnesio soluble, como los factores ambientales de mayor influencia en la distribución y abundancia de N. rudis.Population structure and environmental relationships of the tropical tree Nectandra rudis (Lauraceae, a rare species in western Mexico. The tree N. rudis is a rare species from western Mexico of which community and population features are unknown. We studied a population in an altitudinal gradient, from 550-1 850 m above sea level in the Sierra de Manantlan, Jalisco, Mexico. We established four 60x48 m sample sites at vertical distances of 100 m along this altitudinal gradient. Within each plot, ten 100 m² circular sub-sampling units were randomly

  12. Aproveitamento de resíduos de painéis de madeira gerados pela indústria moveleira na produção de pequenos objetos Small objetcs manufactured with wood panel residues generated by rhe furniture industry

    Directory of Open Access Journals (Sweden)

    Luciana Barbosa de Abreu

    2009-02-01

    Full Text Available Os painéis reconstituídos à base de madeira ganharam espaço antes ocupado pela madeira maciça, o que tem gerado volume expressivo de resíduos. A indústria moveleira contribui para a geração desses resíduos, que se apresentam como alternativa viável para a exploração de sua aplicação na produção artesanal de pequenos objetos. Este trabalho teve por objetivo produzir pequenos objetos com painéis e com mistura de resíduos de painéis de madeira, a fim de comparar suas qualidades. A partir de 10 projetos gráficos, três artesãos confeccionaram 10 pequenos objetos, utilizando painéis de MDF (Medium Density Fiberboard, OSB (Oriented Strand Board e compensado. Cada artesão produziu nove exemplares de cada objeto. Um quarto artesão confeccionou os mesmos objetos com resíduos de três empresas do polo moveleiro da cidade de Ubá, MG, com três repetições, sendo comparados os atributos de qualidade dos objetos. Concluiu-se que todos os painéis são adequados para a confecção dos objetos e alguns se destacam em relação a outros, conforme o atributo avaliado. Os objetos confeccionados com a mistura de resíduos de painéis de madeira tiveram acabamento uniforme e não apresentaram diferenças significativas em relação aos produzidos com painéis com relação aos atributos funcionalidade, peso, proporção e simetria. A mistura de resíduos de diferentes painéis influenciou negativamente a avaliação dos atributos acabamento, beleza e cor. Um objeto produzido a partir de resíduos do mesmo painel pode ser mais harmonioso e atrativo. É tecnicamente viável a produção de pequenos objetos a partir de resíduos de painéis de madeira vindos de indústrias moveleiras.Wood residue panels have been used in substitution of solid wood. As a consequence, the volume of residues has been increasing day-by-day. The furniture industries are the major generators of these residues. Their use as raw material for the production of

  13. Abscesso hepático e êmbolos sépticos pulmonares: uma rara associação causada por E.Coli doi: 10.20513/2447-6595.2016v56n1p75-78

    Directory of Open Access Journals (Sweden)

    Lara Silva Aguiar

    2016-06-01

    Full Text Available A Embolia Séptica Pulmonar (ESP é uma condição mórbida rara caracterizada pela presença de múltiplos abscessos na periferia do parênquima pulmonar, em adição ao isolamento de bactérias no sangue ou em locais de infecção. Relatamos o caso de um homem de 52 anos com história de colecistite litiásica crônica, admitido com quadro de êmbolos sépticos pulmonares por Escherichia coli secundários a abscesso hepático causado por fístula enterobiliar. Em virtude da raridade dessa associação na literatura, descreveremos esse caso com o objetivo de promover seu reconhecimento precoce, já que o tratamento adequado com antibioticoterapia proporciona um melhor prognóstico aos pacientes.

  14. Infecção cutânea rara por Acinetobacter baumannii em imunocompetente: relato de um caso Rare cutaneous infection by Acinetobacter baumannii in an immunocompetent patient: a case report

    Directory of Open Access Journals (Sweden)

    Pablo Vitoriano Cirino

    2008-08-01

    Full Text Available O Acinetobacter baumanni é patógeno oportunista antigamente considerado de baixa virulência. Atualmente está envolvido em processos infecciosos que acometem pacientes imunocomprometidos,grandes queimados e pacientes em unidades de terapia intensiva que fazem uso de ventilação mecânica. Esse relato de caso chama atenção para infecção cutânea rara por essa bactéria em paciente imunocompetente.Acinetobacter baumannii is an oportunistic pathogen that used to be considered as having low virulence; however, it is currently known to be involved in infectious processes in patients with immunosuppression, large burns and those under mechanical ventilation in intensive care units. This case report emphasizes the possibility of cutaneous infection by A. baumanni in immunocompetent patients.

  15. Hemangioendotelioma epitelióide da pleura â Uma apresentação rara a propósito de um caso clínico

    OpenAIRE

    Sónia André; Carla Valente; Benedita Paiva; Alice Pêgo; Lina Carvalho; A. Segorbe Luís

    2010-01-01

    Resumo: O hemangioendotelioma epitelióide (HEE) é um tumor de origem vascular, de grau intermédio de malignidade, cuja apresentação primária na pleura é rara. Pelo reduzido número de casos descritos na literatura, os autores apresentam o caso de uma doente de 65 anos, que recorreu ao serviço de urgência por toracalgia à direita, com sete meses de evolução, na sequência de um traumatismo torácico. Radiologicamente apresentava sinais sugestivos de derrame pleural direito de volum...

  16. TERRA and hnRNPA1 orchestrate an RPA-to-POT1 switch on telomeric single-stranded DNA.

    Science.gov (United States)

    Flynn, Rachel Litman; Centore, Richard C; O'Sullivan, Roderick J; Rai, Rekha; Tse, Alice; Songyang, Zhou; Chang, Sandy; Karlseder, Jan; Zou, Lee

    2011-03-24

    Maintenance of telomeres requires both DNA replication and telomere 'capping' by shelterin. These two processes use two single-stranded DNA (ssDNA)-binding proteins, replication protein A (RPA) and protection of telomeres 1 (POT1). Although RPA and POT1 each have a critical role at telomeres, how they function in concert is not clear. POT1 ablation leads to activation of the ataxia telangiectasia and Rad3-related (ATR) checkpoint kinase at telomeres, suggesting that POT1 antagonizes RPA binding to telomeric ssDNA. Unexpectedly, we found that purified POT1 and its functional partner TPP1 are unable to prevent RPA binding to telomeric ssDNA efficiently. In cell extracts, we identified a novel activity that specifically displaces RPA, but not POT1, from telomeric ssDNA. Using purified protein, here we show that the heterogeneous nuclear ribonucleoprotein A1 (hnRNPA1) recapitulates the RPA displacing activity. The RPA displacing activity is inhibited by the telomeric repeat-containing RNA (TERRA) in early S phase, but is then unleashed in late S phase when TERRA levels decline at telomeres. Interestingly, TERRA also promotes POT1 binding to telomeric ssDNA by removing hnRNPA1, suggesting that the re-accumulation of TERRA after S phase helps to complete the RPA-to-POT1 switch on telomeric ssDNA. Together, our data suggest that hnRNPA1, TERRA and POT1 act in concert to displace RPA from telomeric ssDNA after DNA replication, and promote telomere capping to preserve genomic integrity.

  17. Assessment of fish health around the Terra Nova oil development site on the Grand Banks

    Energy Technology Data Exchange (ETDEWEB)

    Mathieu, A.; Hanlon, J.; Melvin, W.; French, B. [Oceans Ltd., St. John' s, NL (Canada); Myers, M. [Northwest Fisheries Science Center, Seattle, WA (United States); Williams, U.; Janes, G. [Petro-Canada, East Coast Operations, St. John' s, NL (Canada); Wight, F. [Husky Oil Operations Ltd., St. John' s, NL (Canada)

    2010-07-01

    American plaice are used as an indicator species for environmental effects monitoring (EEM) programs in the Grand Banks area of Newfoundland. This study reported on fish health studies conducted between 2000 to 2006 at the Terra Nova oil development site before and after the release of produced waters. A total of 500 fishes were studied for a 5-year period in order to evaluate health effect indicators including fish condition; visible skin and organ lesions; levels of mixed-function-oxygenase (MFO) enzymes; haematology; and various histopathological indices in the liver and gills. The study demonstrated slight elevations of MFO enzyme activity in fish from the development site in 2002, before the release of produced water. On the basis of the various studied indicators, results suggest that the project is not having a significant impact on the health of American plaice.

  18. Geomorphologic Interpretation of Southwest Arabia Terra, Mars: Evidence of Regional, Long- Duration Fluvial Activity

    Science.gov (United States)

    Salvatore, M. R.; Allen, C. C.; Oehler, D. Z.; Wilkinson, J.

    2007-12-01

    Southwest Arabia Terra, Mars, is home to seven candidate Mars Science Laboratory (MSL) landing sites and is immediately north of the Mars Exploration Rover (MER) Opportunity in Meridiani Planum. Some of the strongest evidence for the past presence of liquid water exists in this region: the strong hematite signals from Meridiani revealed by the Thermal Emission Spectrometer (TES) as well as evidence of layering and analyses of rocks that must have formed in the presence of water by Opportunity. To better understand this region and the context for the potential MSL landing sites, a detailed geologic map was produced during the summer of 2007. The numerous exposed layers present in southwest Arabia Terra reveal a vast history of deposition and erosion. Of particular interest is the widespread geologic unit containing sinuous, inverted ridges of varying lengths, widths, and orientations. This ridge-forming unit appears to have once been dominant throughout much of the study region. Since its original formation, deposition and erosion have obscured or removed sections of this unit to produce the fragmented and discontinuous pattern that we see today. Analyses of these inverted ridges suggest that they are sedimentary in nature and are likely to be the cemented and hardened remains of ancient stream channels. One analog we are considering is that of a terrestrial megafan. Megafans, which are relatively new concepts in geology, are onshore sedimentary features laid down by rivers over extended periods of time. They are defined as major, regional geomorphic forms (similar to alluvial fans) that are greater than 100 kilometers in radius and typically have a slope of less than 1º. They differ from alluvial fans in main stream behavior; streams in alluvial fans will quickly split into numerous smaller streams while streams that form megafans remain as one continuous stream. The comparison of the ridged-unit to a terrestrial megafan is based on several features including the

  19. Classification of agricultural fields using time series of dual polarimetry TerraSAR-X images

    Directory of Open Access Journals (Sweden)

    S. Mirzaee

    2014-10-01

    Full Text Available Due to its special imaging characteristics, Synthetic Aperture Radar (SAR has become an important source of information for a variety of remote sensing applications dealing with environmental changes. SAR images contain information about both phase and intensity in different polarization modes, making them sensitive to geometrical structure and physical properties of the targets such as dielectric and plant water content. In this study we investigate multi temporal changes occurring to different crop types due to phenological changes using high-resolution TerraSAR-X imagers. The dataset includes 17 dual-polarimetry TSX data acquired from June 2012 to August 2013 in Lorestan province, Iran. Several features are extracted from polarized data and classified using support vector machine (SVM classifier. Training samples and different features employed in classification are also assessed in the study. Results show a satisfactory accuracy for classification which is about 0.91 in kappa coefficient.

  20. Pequenas Histórias Soltas: Mais do Que a Terra do Champanha

    Directory of Open Access Journals (Sweden)

    Mariana Schwaab Machiavelli

    2013-04-01

    Full Text Available O município de Garibaldi está localizado na região turística Uva e Vinho, na Serra Gaúcha, a 110km da capital Porto Alegre. Dentro do cenário entorurístico do qual faz parte, busca diferenciar-se através da produção de espumantes, pioneira no país, quando em 1913 foi produzida a primeira garrafa na Vinícola Peterlongo. Por isso o município se autodenomina Terra do Champanha. Aproveitando esse diferencial, destaca-se no cenário regional pela realização bianual da Festa Nacional do Champanha – FENACHAMP.

  1. Large-scale fluid-deposited mineralization in Margaritifer Terra, Mars

    Science.gov (United States)

    Thomas, Rebecca J.; Potter-McIntyre, Sally L.; Hynek, Brian M.

    2017-07-01

    Mineral deposits precipitated from subsurface-sourced fluids are a key astrobiological detection target on Mars, due to the long-term viability of the subsurface as a habitat for life and the ability of precipitated minerals to preserve biosignatures. We report morphological and stratigraphic evidence for ridges along fractures in impact crater floors in Margaritifer Terra. Parallels with terrestrial analog environments and the regional context indicate that two observed ridge types are best explained by groundwater-emplaced cementation in the shallow subsurface and higher-temperature hydrothermal deposition at the surface, respectively. Both mechanisms have considerable astrobiological significance. Finally, we propose that morphologically similar ridges previously documented at the Mars 2020 landing site in NE Syrtis Major may have formed by similar mechanisms.

  2. DTM-based automatic mapping and fractal clustering of putative mud volcanoes in Arabia Terra craters

    Science.gov (United States)

    Pozzobon, R. P.; Mazzarini, F. M.; Massironi, M. M.; Cremonese, G. C.; Rossi, A. P. R.; Pondrelli, M. P.; Marinangeli, L. M.

    2017-09-01

    Arabia Terra is a region of Mars where occurrence of past-water manifests at surface and subsurface. To date, several landforms associated with this activity were recognized and mapped, directly influencing the models of fluid circulation. In particular, within several craters such as Firsoff and an unnamed southern crater, putative mud volcanoes were described by several authors. In fact, numerous mounds (from 30 m of diameter in the case of monogenic cones, up to 3-400 m in the case of coalescing mounds) present an apical vent-like depression, resembling subaerial Azerbaijan mud volcanoes and gryphons. To this date, landform analysis through topographic position index and curvatures based on topography was never attempted. We hereby present a landform classification method suitable for mounds automatic mapping. Their resulting spatial distribution is then studied in terms of self-similar clustering.

  3. Terra, Aqua, and Aura Direct Broadcast - Providing Earth Science Data for Realtime Applications

    Science.gov (United States)

    Kelly, Angelita C.; Coronado, Patrick L.; Case, Warren F.; Franklin, Ameilia

    2010-01-01

    The need for realtime data to aid in disaster management and monitoring has been clearly demonstrated for the past several years, e.g., during the tsunami in Indonesia in 2004, the hurricane Katrina in 2005, fires, etc. Users want (and often require) the means to get earth observation data for operational regional use as soon as they are generated by satellites. This is especially true for events that can cause loss of human life and/or property. To meet this need, NASA's Earth Observing System (EOS) satellites, Terra and Aqua, provide realtime data useful to disaster management teams. This paper describes the satellites, their Direct Broadcast (DB) capabilities, the data uses, what it takes to deploy a DB ground station, and the future of the DB.

  4. Statistical Analysis of Deflation in Covariance and Resultant Pc Values for AQUA, AURA and TERRA

    Science.gov (United States)

    Hasan, Syed O.

    2016-01-01

    This presentation will display statistical analysis performed for raw conjunction CDMs received for the EOS Aqua, Aura and Terra satellites within the period of February 2015 through July 2016. The analysis performed indicates a discernable deflation in covariance calculated at the JSpOC after the utilization of the dynamic drag consider parameter was implemented operationally in May 2015. As a result, the overall diminution in the conjunction plane intersection of the primary and secondary objects appears to be leading to reduced probability of collision (Pc) values for these conjunction events. This presentation also displays evidence for this theory with analysis of Pc trending plots using data calculated by the SpaceNav CRMS system.

  5. Live-cell imaging of budding yeast telomerase RNA and TERRA.

    Science.gov (United States)

    Laprade, Hadrien; Lalonde, Maxime; Guérit, David; Chartrand, Pascal

    2017-02-01

    In most eukaryotes, the ribonucleoprotein complex telomerase is responsible for maintaining telomere length. In recent years, single-cell microscopy techniques such as fluorescent in situ hybridization and live-cell imaging have been developed to image the RNA subunit of the telomerase holoenzyme. These techniques are now becoming important tools for the study of telomerase biogenesis, its association with telomeres and its regulation. Here, we present detailed protocols for live-cell imaging of the Saccharomyces cerevisiae telomerase RNA subunit, called TLC1, and also of the non-coding telomeric repeat-containing RNA TERRA. We describe the approach used for genomic integration of MS2 stem-loops in these transcripts, and provide information for optimal live-cell imaging of these non-coding RNAs. Copyright © 2016 Elsevier Inc. All rights reserved.

  6. Assessing the Success of Postfire Reseeding in Semiarid Rangelands Using Terra MODIS

    Science.gov (United States)

    Chen, Fang; Weber, Keith T.; Scbnase, John L.

    2012-01-01

    Successful postfire reseeding efforts can aid rangeland ecosystem recovery by rapidly establishing a desired plant community and thereby reducing the likelihood of infestation by invasive plants. Although the success of postfire remediation is critical, few efforts have been made to leverage existing geospatial technologies to develop methodologies to assess reseeding success following a fire. In this study, Terra Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data were used to improve the capacity to assess postfire reseeding rehabilitation efforts, with particular emphasis on the semiarid rangelands of Idaho. Analysis of MODIS data demonstrated a positive effect of reseeding on rangeland ecosystem recovery, as well as differences in vegetation between reseeded areas and burned areas where no reseeding had occurred (P,0.05). We conclude that MODIS provides useful data to assess the success of postfire reseeding.

  7. A Case of Terra Firma-Forme Dermatosis Treated with Salicylic Acid Alcohol Peeling.

    Science.gov (United States)

    Chun, Sin Wook; Lee, Suk Young; Kim, Jong Baik; Choi, Hoo Min; Ro, Byung In; Cho, Han Kyoung

    2017-02-01

    Terra firma-forme dermatosis (TFFD) is a bizarre, acquired and idiopathic dermatosis that etiology has still not been fully defined. It is characterized by the presence of asymptomatic, brownish dirt-like lesion maybe due to disorder of keratinization. These lesions cannot be removed with ordinary cleansing. Therefore, TFFD can be differentiated from dermatosis neglecta. Patient was a 17-year-old man with brownish lesions on his face for 1 month. The patient had a history of regular washing habit with soap and water. The lesions were asymptomatic however due to cosmetic reasons, the patient wanted to treat his skin lesions. Punch biopsy revealed hyperkeratosis and fungal spore are in stratum corneum. Salicylic acid peeling with alcohol base was performed on the patient's face. The skin lesions disappeared completely on gentle swabbing with peeling. In this point, the diagnosis of TFFD could be considered. Since, this disease can be confused with dermatosis neglecta, we report this case with literature review.

  8. Spatially Complete Surface Albedo Data Sets: Value-Added Products Derived from Terra MODIS Land Products

    Science.gov (United States)

    Moody, Eric G.; King, Michael D.; Platnick, Steven; Schaaf, Crystal B.; Gao, Feng

    2004-01-01

    Spectral land surface albedo is an important parameter for describing the radiative properties of the Earth. Accordingly it reflects the consequences of natural and human interactions, such as anthropogenic, meteorological, and phenological effects, on global and local climatological trends. Consequently, albedos are integral parts in a variety of research areas, such as general circulation models (GCMs), energy balance studies, modeling of land use and land use change, and biophysical, oceanographic, and meteorological studies. Recent observations of diffuse bihemispherical (white-sky) and direct beam directional hemispherical (black-sky ) land surface albedo included in the MOD43B3 product from MODIS instruments aboard NASA's Terra and Aqua satellite platforms have provided researchers with unprecedented spatial, spectral, and temporal characteristics. Cloud and seasonal snow cover, however, curtail retrievals to approximately half the global land surfaces on an annual equal-angle basis, precluding MOD43B3 albedo products from direct inclusion in some research projects and production environments.

  9. Notícia de romances, folhetos e folhas volantes na terra de Miranda

    Directory of Open Access Journals (Sweden)

    António Bárbolo Alves

    2008-11-01

    Full Text Available Au Portugal la « littérature de colportage » est appelée « literatura de cordel », « folhas volantes » ou « folhetos ». Dans la région Terra de Miranda, à l'extrême nord-est du Portugal, ces livres populaires ont circulé jusqu'à la moitié du XX siècle mais, malheureusement, ils ont presque totalement disparu. Dans cet article, guidés par la mémoire et le savoir d'une conteuse, on essaiera de retrouver quelques traces de ces « folhetos » : leurs caractéristiques techniques et poétiques, les sujets les plus importants et la langue (étant donné que dans cette région on parle aussi le mirandais.

  10. As vozes da mímica pós-colonial em Terra Papagalli

    Directory of Open Access Journals (Sweden)

    Jacimara Vieira dos Santos

    2015-01-01

    Full Text Available This paper draws on the studies undertaken in the area of cultural studies, inparticular,Homi Bhabha‟s formulations, to propose an analysis of the BraziliannovelTerra Papagalli(by José Roberto Torero and Marcus Aurelius Pimenta,showing how the narrative dismounts historical reality, to explore other angles; and shifts the focus to the imaginary construction that involves revisiting theDiscoveries. Thus, contrary to expectations, revealing paradoxes such as thosewhich tend to increase civic and commemorative urges that liveantagonistically, with anti-establishment thoughts that questionthe internalconnections of these developments, articulating, through mimetic resources,other voices and their critic repetitions of contested models and references.

  11. Mars Eolian Geology at Airphoto Scales: The Large Wind Streaks of Western Arabia Terra

    Science.gov (United States)

    Edgett, Kenneth S.

    2001-01-01

    More than 27,000 pictures at aerial photograph scales (1.5-12 m/pixel) have been acquired by the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) since September 1997. The pictures are valuable for testing hypotheses about geologic history and processes of Mars. Of particular interest are eolian features connected to surface albedo patterns. This work is focused on low-albedo wind streaks, some over 100 km long, in western Arabia Terra. Each streak is widest where it originates at an impact crater (typically 25-150 km diameter). The streaks taper downwind. Within the associated craters there is a lower-albedo surface that, in nearly all observed cases, includes barchan dunes indicative of transport in the same direction as the wind streaks. Upwind of the dunes there is usually an outcrop of layered material that might have served as a source for dune sand. MOC images show that the west Arabia streaks consist of a smooth-surfaced, multiple-meters-thick, mantle (smooth at 1.5 m/pixel) that appears to be superposed on local surfaces. No dunes are present, indicating that down-streak transport of sediment via saltation and traction have not occurred. Two models might explain the observed properties: (1) the streaks consist of dark silt- and clay-sized grains deflated from the adjacent crater interiors and deposited from suspension or (2) they are remnants (protected in the lee of impact crater rims) of a formerly much larger, regional covering of low albedo, smooth-surfaced mantle. The latter hypothesis is based on observation of low albedo mantled surfaces occurring south of west Arabia in Terra Meridiani. For reasons yet unknown, a large fraction of the martian equatorial regions are covered by low albedo, mesa-forming material that lies unconformably atop eroded layered and cratered terrain. Both hypotheses are being explored via continued selective targeting of new MOC images as well as analyses of the new data.

  12. Prediction of Forest Stand Attributes Using TerraSAR-X Stereo Imagery

    Directory of Open Access Journals (Sweden)

    Mikko Vastaranta

    2014-04-01

    Full Text Available Consistent, detailed and up-to-date forest resource information is required for allocation of forestry activities and national and international reporting obligations. We evaluated the forest stand attribute prediction accuracy when radargrammetry was used to derive height information from TerraSAR-X stereo imagery. Radargrammetric elevations were normalized to heights above ground using an airborne laser scanning (ALS-derived digital terrain model (DTM. Derived height metrics were used as predictors in the most similar neighbor (MSN estimation approach. In total, 207 field measured plots were used in MSN estimation, and the obtained results were validated using 94 stands with an average area of 4.1 ha. The relative root mean square errors for Lorey’s height, basal area, stem volume, and above-ground biomass were 6.7% (1.1 m, 12.0% (2.9 m2/ha, 16.3% (31.1 m3/ha, and 16.1% (15.6 t/ha. Although the prediction accuracies were promising, it should be noted that the predictions included bias. The respective biases were −4.6% (−0.7 m, −6.4% (−1.6 m2/ha, −9.3% (−17.8 m3/ha, and −9.5% (−9.1 t/ha. With detailed DTM, TerraSAR-X stereo radargrammetry-derived forest information appears to be suitable for providing consistent forest resource information over large areas.

  13. Tectonics and volcanism of Eastern Aphrodite Terra: No subduction, no spreading

    Science.gov (United States)

    Hansen, Vicki L.; Keep, Myra; Herrick, Robert R.; Phillips, Roger J.

    1992-01-01

    Eastern Aphrodite Terra is approximately equal in size to the western North American Cordillera, from Mexico to Alaska. Its size and unique landforms make it an important area for understanding the tectonics of Venus, yet models for its formation are diametrically opposed. This region is part of the Equatorial Highlands, which was proposed as a region of lithospheric thinning, isostatic uplift, and attendant volcanism. Eastern Aphrodite Terra is dominated by circular structures within which deformation and volcanism are intimately related. These structures are marked by radial and concentric fractures, and volcanic flows that emanate from a central vent, as well as from concentric fracture sets. Cross-cutting relations between flows and concentric fracture sets indicate that outer concentric fracture sets are younger than inner fracture sets. The circular structures are joined by regional northeast- to east-trending fractures that dominantly postdate formation of the circular structures. We propose that the circular structures 'grow' outward with time. Although these structures probably represent addition of crust to the lithosphere, they do not represent significant lithospheric spreading or convergence, and the region does not mark the boundary between two distinct tectonic plates. This region is not easily explained by analogy with either terrestrial midocean rifts or subduction zones. It is perhaps best explained by upwelling of magma diapirs that blister the surface, but do not cause significant lithospheric spreading. Further study of the structural and volcanic evolution of this region using Magellan altimetry and SAR data should lead to better understanding of the tectonic evolution of this region.

  14. The TERRA project, a space nuclear micro-reactor case study

    Energy Technology Data Exchange (ETDEWEB)

    Guimaraes, Lamartine N.F.; Nascimento, Jamil A.; Borges, Eduardo M.; Lobo, Paulo D. Castro, E-mail: guimarae@ieav.cta.br, E-mail: jamil@ieav.cta.br, E-mail: eduardo@ieav.cta.br [Divisao de Energia Nuclear. Instituto de Estudos Avancados, Sao Jose dos Campos, SP (Brazil); Placco, Guilherme M.; Barrios Junior, Ary G. [Faculdade de Tecnologia Sao Francisco (FATESF), Jacarei, SP (Brazil)

    2011-07-01

    The TEcnologia de Reatores Rapidos Avancados project, also known as TERRA Project is been conducted by the Institute for Advanced Studies IEAv. The TERRA project has a general objective of understanding and developing the key technologies that will allow (Brazil) the use of nuclear technology to generate electricity in space. This electricity may power several space systems and/or a type of plasma based engine. Also, the type of reactor intended for space may be used for power generation in very inhospitable environment such as the ocean floor. Some of the mentioned technologies may include: Brayton cycles, Stirling engines, heat pipes and its coupled systems, nuclear fuel technology, new materials and several others. Once there is no mission into which apply this technology, at this moment, this research may be conducted in many forms and ways. The fact remains that when this technology becomes needed there will be no way that we (Brazilians) will be able to buy it from. This technology, in this sense, is highly strategic and will be the key to commercially explore deep space. Therefore, there is the need to face the development problems and solve them, to gain experience with our own rights and wrongs. This paper will give a brief overview of what has been done so far, on experimental facilities and hardware that could support space system development, including a Brayton cycle test facility, Tesla turbine testing, and Stirling engine development and modeling. Our great problem today is lack of human resources. To attend that problem we are starting a new graduate program that will allow overcoming that, given the proper time frame. (author)

  15. Geologic Map of MTM -20012 and -25012 Quadrangles, Margaritifer Terra Region of Mars

    Science.gov (United States)

    Grant, J. A.; Wilson, S.A.; Fortezzo, C.M.; Clark, D.A.

    2009-01-01

    Mars Transverse Mercator (MTM) -20012 and -25012 quadrangles (lat 17.5 deg - 27.5 deg S., long 345 deg - 350 deg E.) cover a portion of Margaritifer Terra near the east end of Valles Marineris. The map area consists of a diverse assemblage of geologic surfaces including isolated knobs of rugged mountainous material, heavily cratered and dissected ancient highland material, a variety of plains materials, chaotic terrain materials, and one of the highest densities of preserved valleys and their associated deposits on the planet (Saunders, 1979; Baker, 1982; Phillips and others, 2000, 2001). The map area is centered on a degraded, partially filled, ~200-km-diameter impact structure (lat 22 deg S., long 347.5 deg E.), informally referred to as Parana basin, located between Parana Valles to the east and Loire Valles to the west. Parana Valles is a network of multidigitate, mostly east-west-oriented valleys that flowed west and discharged into Parana basin (Grant, 1987, 2000; Grant and Parker, 2002). Loire Valles, broadly comparable in length to the Grand Canyon on Earth, has a deeply incised channel within the map area that originates at the west-northwest edge of Erythraeum Chaos within Parana basin (Grant, 1987, 2000; Grant and Parker, 2002; Strom and others, 2000). Parana and Loire Valles, combined with Samara Valles to the west, form one of the most laterally extensive, well-integrated valley networks on Mars (Grant, 2000) and record a long history of modification by fluvial processes. The origin and morphology of the valley networks, therefore, provide insight into past environmental conditions, whereas their relation with other landforms helps constrain the timing and role of fluvial processes in the evolution and modification of the Margaritifer Terra region.

  16. Influence of biochar and terra preta substrates on wettability and erodibility of soils

    Science.gov (United States)

    Smetanova, A.; Dotterweich, M.; Diehl, D.; Ulrich, U.; Fohrer, N.

    2012-04-01

    Biochar (BC) and terra preta substrates (TPS) have recently been promoted as soil amendments suitable for soil stabilization, soil amelioration and long-term carbon sequestration. BC is a carbon-enriched substance produced by thermal decomposition of organic material. TPS is composed of liquid and solid organic matter, including BC, altered by acid-lactic fermentation. Their effect on wettability, soil erodibility and nutrient discharge through overland flow was studied by laboratory experiments. At water contents between 0 and 100% BC is water repellent, while TPS changes from a wettable into a repellent state. The 5 and 10 vol % mixtures of BC and 10 and 20 vol% mixtures of TPS with sand remain mainly wettable during drying but repellency maxima are shifted to higher water contents with respect to pure sand and are mainly of subcritical nature. The runoff response was dominated by infiltration properties of the substrates rather than their wettability.Only one mixtures (20% TPS) produced more runoff than sandy-loamy soil on a 15% slope at an intensity of 25 mm•h-1. The 10% BC decreased runoff by up to 40%. At higher rainfall intensities (45 and 55 mm•h-1) the 10% TPS7 was up to 35% less erodible than 10% BC. Despite the TPS containing more nutrients, nutrient discharge varied between types of nutrients, slopes, rainfall intensities and mixtures. The application of a 1 cm layer onto the soil surface instead of 10% mixtures is not recommended due to high nutrient concentrations in the runoff and the wettability of pure substrates. The usage of 10% BC in lowland areas with low frequency and low-intensity precipitation and 10% TPS7 in areas with higher rainfall intensities appears to be appropriate and commendable according to current results. However, together with reversibility of repellency, it needs to undergo further examination in the field under different environmental and land use conditions Key words: biochar, terra preta substrate, wettability

  17. Sustainable land-use by regional energy and material flow management using "Terra-Preta-Technology

    Science.gov (United States)

    Friede, K.; Rößler, K.; Terytze, K.; Vogel, I.; Worzyk, F.; Schatten, R.; Wagner, R.; Haubold-Rosar, M.; Rademacher, A.; Weiß, U.; Weinfurtner, K.; Drabkin, D.; Zundel, S.; Trabelsi, S.

    2012-04-01

    The interdisciplinary and transdisciplinary joint research project seeks innovative system solutions for resource efficiency, climate protection and area revaluation by means of an integrative approach. The project's fundament is set by implementing the zero-emission-strategy, launching a regional resource efficient material flow management as well as utilising "Terra-Preta-Technology" as an innovative system component. As the centrepiece of optimised regional biogenic material flows Terra Preta Substrate (TPS) contains biochar shall be utilised exemplarily in model regions. In regional project 1 (state of Brandenburg, county Teltow-Fläming) TPS shall be used on military conversion areas, which are contaminated with polycyclic aromatic hydrocarbons and mineral oil hydrocarbons. It will be examined, whether the use of TPS causes accelerated pollutant reduction and whether this area is available for renewable raw material production. In regional project 2 (Western Lusatia, county Oberspreewald-Lusatia) reclamation and renaturation of post-mining-landscapes is first priority. In this case, the project seeks for an upgrade of devastated soils for plant production as well as for restoration of soil functions and setup of organic soil substances. In regional project 3 (state of North Rhine-Westphalia, city of Schmallenberg) reforestations of large scale windbreakage areas shall be supported by using TPS. Soil stabilisation, increased growth and survival of young trees and decreased nutrient losses are desired achievements. The crop production effectiveness and environmental compatibility of TPS will be determined by tests in laboratories, by lysimeter and open land taking into account chemical and physical as well as biological parameters. Currently diverse chemical, physical and biological examinations are performed. First results will be presented. The focus will be set on the use of TPS on military conversion areas to reduce specific organic contaminations.

  18. MICROPROPAGAÇÃO DE CLONES DE BANANA cv. TERRA EM BIORREATOR DE IMERSÃO TEMPORÁRIA MICROPROPAGATION OF BANANA TERRA USING TEMPORARY IMMERSION BIOREACTORS

    Directory of Open Access Journals (Sweden)

    EURICO EDUARDO PINTO DE LEMOS

    2001-12-01

    Full Text Available Mudas micropropagadas de banana têm sido ofertadas ao mercado com o intuito de suprir a demanda de uma fruticultura cada vez mais tecnificada. Os preços mais elevados deste tipo de muda têm sido um dos maiores entraves ao seu uso. Vários são os fatores que oneram o seu preço final: mão-de-obra especializada, necessidade de laboratórios bem equipados, estrutura de aclimatização apropriada, baixa taxa de multiplicação de algumas variedades, etc. O presente trabalho relata a micropropagação de bananeiras cv. Terra, utilizando biorreatores de imersão temporária, com o objetivo de aumentar a taxa de multiplicação e diminuir os custos de produção das mudas. Os resultados obtidos mostraram que o ciclo de imersão de 4 horas e a renovação do meio de cultura aos 30 dias foram essenciais para uma maior produção de biomassa e crescimento dos explantes. A composição do meio de cultura influenciou o desenvolvimento dos explantes de banana cultivados nos biorreatores. Explantes cultivados em meio MS + 3mg/L de BAP com renovação para MS básico, após 30 dias, apresentaram maior produção de biomassa e alta taxa de multiplicação. Comparando-se o biorreator de imersão temporária com o sistema tradicional em semi-sólido, observou-se que, no primeiro, as microplantas apresentaram maior comprimento, produção de biomassa de 2,86 vezes maior e 2,20 vezes mais brotos do que no sistema tradicional.Banana seedlings has been micropropagated and sold to the producers to supply a rather competitive fruit crop market. This high quality propagule has usually a higher price in the market than field propagated seedlings. Several factors contribute to its final costs: need of specialized labour, need of well equipped laboratory and acclimatization structure, low multiplication rate of some varieties etc. The work presented here reports the development of a new way to micropropagate banana var. Terra, a known slow seedling producing variety

  19. Expression of Telomeres in Astrocytoma WHO Grade 2 to 4: TERRA Level Correlates with Telomere Length, Telomerase Activity, and Advanced Clinical Grade12

    Science.gov (United States)

    Sampl, Sandra; Pramhas, Sibylle; Stern, Christian; Preusser, Matthias; Marosi, Christine; Holzmann, Klaus

    2012-01-01

    Cancer cells bypass replicative senescence, the major barrier to tumor progression, by using telomerase or alternative lengthening of telomeres (ALT) as telomere maintenance mechanisms (TMMs). Correlation between ALT and patient survival was demonstrated for high-grade astrocytomas. Transcription from subtelomeres produces telomeric repeat-containing RNA (TERRA), a natural inhibitor of telomerase activity (TA). This led us to evaluate correlations of TERRA and TMM with tumor grade and outcome in astrocytoma patients. SYBR Green real-time reverse transcription-polymerase chain reaction assays for quantitation of total and chromosome 2p and 18p specific TERRA levels were developed. Tumor samples from 46 patients with astrocytoma grade 2 to 4, tissue controls, and cell lines were assessed. TMMs were evaluated by measuring TA and by detecting long telomeres due to ALT. In glioblastoma multiforme (GBM) grade 4, total TERRA levels were similar to cell lines but 14-, 31-, and 313-fold lower compared with grade 3, grade 2, and nonmalignant tissue, respectively. Total TERRA levels differed from chromosomal levels. Low 2p TERRA levels correlated with dense promoter methylation of subtelomeric CpG islands, indicating that TERRA expression in gliomas may be chromosome specific and epigenetically regulated. Total TERRA levels correlated with diagnosis, with low or absent TA and the presence of ALT, and were tentatively associated with favorable patient prognosis in our cohort (P = .06). TA and short telomeres identified a subset of GBM with a median survival of only 14.8 months. TERRA and TA may be prognostic in astrocytic tumors. PMID:22348177

  20. Expression of telomeres in astrocytoma WHO grade 2 to 4: TERRA level correlates with telomere length, telomerase activity, and advanced clinical grade.

    Science.gov (United States)

    Sampl, Sandra; Pramhas, Sibylle; Stern, Christian; Preusser, Matthias; Marosi, Christine; Holzmann, Klaus

    2012-02-01

    Cancer cells bypass replicative senescence, the major barrier to tumor progression, by using telomerase or alternative lengthening of telomeres (ALT) as telomere maintenance mechanisms (TMMs). Correlation between ALT and patient survival was demonstrated for high-grade astrocytomas. Transcription from subtelomeres produces telomeric repeat-containing RNA (TERRA), a natural inhibitor of telomerase activity (TA). This led us to evaluate correlations of TERRA and TMM with tumor grade and outcome in astrocytoma patients. SYBR Green real-time reverse transcription-polymerase chain reaction assays for quantitation of total and chromosome 2p and 18p specific TERRA levels were developed. Tumor samples from 46 patients with astrocytoma grade 2 to 4, tissue controls, and cell lines were assessed. TMMs were evaluated by measuring TA and by detecting long telomeres due to ALT. In glioblastoma multiforme (GBM) grade 4, total TERRA levels were similar to cell lines but 14-, 31-, and 313-fold lower compared with grade 3, grade 2, and nonmalignant tissue, respectively. Total TERRA levels differed from chromosomal levels. Low 2p TERRA levels correlated with dense promoter methylation of subtelomeric CpG islands, indicating that TERRA expression in gliomas may be chromosome specific and epigenetically regulated. Total TERRA levels correlated with diagnosis, with low or absent TA and the presence of ALT, and were tentatively associated with favorable patient prognosis in our cohort (P = .06). TA and short telomeres identified a subset of GBM with a median survival of only 14.8 months. TERRA and TA may be prognostic in astrocytic tumors.

  1. O Comportamento do Preço da Terra Agrícola: um modelo de painel de dados espaciais

    Directory of Open Access Journals (Sweden)

    Regina Lúcia Sanches Malassise

    2015-12-01

    Full Text Available Resumo: O presente artigo analisou o comportamento do preço da terra agrícola nos municípios do Paraná no período de 1999-2011. Partindo da revisão bibliográfica dos principais estudos nacionais sobre o tema, foi possível identificar os determinantes do preço da terra e os métodos utilizados. Neste sentido, optou­-se por estimar um modelo para o preço da terra via painel de dados espaciais. As estimativas indicaram que o valor bruto da produção agropecuária, a valorização patrimonial, o financiamento total à agropecuária, a relação investimento-receita municipal, o percentual da área plantada do município com soja e a incorporação da dependência espacial do preço da terra são variáveis que explicam o preço da terra no estado do Paraná. Estas explicariam 84% dos preços e indicaram que há maior ajuste intrapainel, sendo os efeitos espaciais mais intensos no próprio município e em relação ao todo. Em especial, o modelo proposto avançou em termos estruturais, com a incorporação de variáveis coletadas para todos os 399 municípios do Paraná, e em termos metodológicos, ao estimar via painéis de dados a influência dos efeitos de espacialidade sobre o preço da terra agrícola, destacando a importância da localização e da vizinhança na determinação de tal preço.

  2. GHRSST Level 2P Global Skin Sea Surface Temperature from the Moderate Resolution Imaging Spectroradiometer (MODIS) on the NASA Terra satellite (GDS version 1)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Moderate-resolution Imaging Spectroradiometer (MODIS) is a scientific instrument (radiometer) launched by NASA in 1999 on board the Terra satellite platform (a...

  3. MODIS/Terra Near Real Time (NRT) Total Precipitable Water Vapor 5-Min L2 Swath 1km and 5km

    Data.gov (United States)

    National Aeronautics and Space Administration — MODIS was launched aboard the Terra satellite on December 18, 1999 (10:30 am equator crossing time) as part of NASA's Earth Observing System (EOS) mission. MODIS...

  4. EASE-Grid 2.0 Land-Ocean-Coastline-Ice Masks Derived from Boston University MODIS/Terra Land Cover Data

    Data.gov (United States)

    National Aeronautics and Space Administration — These Land-Ocean-Coastline-Ice (LOCI) files provide land classification masks derived from the Boston University MOD12Q1 V004 MODIS/Terra 1 km Land Cover Product...

  5. As Ciências da Terra e a mundialização das sociedades

    Directory of Open Access Journals (Sweden)

    Umberto G. Cordani

    1995-12-01

    Full Text Available De acordo com os princípios da Agenda 21, o principal documento resultante da unced-92, a sociedade sustentável do futuro deverá mostrar um desenvolvimento econômico equilibrado, no mundo todo, em harmonia com os sistemas de suporte da vida, em nosso planeta. As Ciências da Terra têm um papel crucial, visto que elas têm a responsabilidade da busca e do gerenciamento dos recursos minerais e energéticos, da conservação, do gerenciamento dos solos e da água, do monitoramento contínuo dos processos dinâmicos do Sistema Terra e da prevenção e mitigação dos desastres naturais. Solidariedade social em nível global é necessária para o alcance futuro de uma sociedade sustentável realmente equitativa e preocupada com a justiça social. Entretanto, as tendências atuais da globalização, sob a égide dos grandes conglomerados transnacionais, são as de dar menor prioridade face a assuntos como preservação ambiental e desenvolvimento econômico do Terceiro Mundo. Tais tendências precisam ser invertidas, e os cientistas e profissionais das Ciências da Terra devem tornar-se proativos, em comunicar-se com políticos, educadores e o público em geral, no sentido de planejar adequadamente as atividades de desenvolvimento, evitando possíveis impactos desastrosos para o ambiente.Following the principles contained in the Agenda 21, the main agreement reached during the unced-92, the future sustainable society shall exhibit an equitable socio-economic development, all over the world, in harmony with the life support systems of our planet. The Earth sciences have a crucial role, because they have the responsibility of the search, provision and management of mineral and energetic resources, the conservation and management of soils and water, the continuous monitoring of the dynamic processes of the Earth system, and the prevention and mitigation of natural disasters. Solidarity among people is needed in order to achieve a truly equitable

  6. Assessment of diverse algorithms applied on MODIS Aqua and Terra data over land surfaces in Europe

    Science.gov (United States)

    Glantz, P.; Tesche, M.

    2012-04-01

    Beside an increase of greenhouse gases (e.g., carbon dioxide, methane and nitrous oxide) human activities (for instance fossil fuel and biomass burning) have lead to perturbation of the atmospheric content of aerosol particles. Aerosols exhibits high spatial and temporal variability in the atmosphere. Therefore, aerosol investigation for climate research and environmental control require the identification of source regions, their strength and aerosol type, which can be retrieved based on space-borne observations. The aim of the present study is to validate and evaluate AOT (aerosol optical thickness) and Ångström exponent, obtained with the SAER (Satellite AErosol Retrieval) algorithm for MODIS (MODerate resolution Imaging Spectroradiometer) Aqua and Terra calibrated level 1 data (1 km horizontal resolution at ground), against AERONET (AErosol RObotic NETwork) observations and MODIS Collection 5 (c005) standard product retrievals (10 km), respectively, over land surfaces in Europe for the seasons; early spring (period 1), mid spring (period 2) and summer (period 3). For several of the cases analyzed here the Aqua and Terra satellites passed the investigation area twice during a day. Thus, beside a variation in the sun elevation the satellite aerosol retrievals have also on a daily basis been performed with a significant variation in the satellite-viewing geometry. An inter-comparison of the two algorithms has also been performed. The validation with AERONET shows that the MODIS c005 retrieved AOT is, for the wavelengths 0.469 and 0.500 nm, on the whole within the expected uncertainty for one standard deviation of the MODIS retrievals over Europe (Δτ = ±0.05 ± 0.15τ). The SAER estimated AOT for the wavelength 0.443 nm also agree reasonable well with AERONET. Thus, the majority of the SAER AOT values are within the MODIS expected uncertainty range, although somewhat larger RMSD (root mean square deviation) occurs compared to the results obtained with the

  7. Jogos de gênero em Pequim 2008: representações de feminilidades e masculinidades (reproduzidas pelo site Terra

    Directory of Open Access Journals (Sweden)

    Johanna Coelho Von Mühlen

    2012-03-01

    Full Text Available Fundamentado na perspectiva pós-estruturalista, mais especificamente nos Estudos de Gênero e nos Estudos Culturais, esse artigo tem como objetivo analisar as representações de gênero produzidas e reproduzidas pelo site Terra sobre os atletas participantes dos Jogos Olímpicos de Pequim. Para tanto foram coletados todos os textos e imagens publicados na seção "Últimas Notícias" e "Fotos" durante os dezessete dias de competição. O material empírico constou de reportagens e imagens que foram metodologicamente tratados pela análise de discurso de inspiração foucaultiana. Dessa análise foi possível perceber que o site Terra exibiu diferentes masculinidades e feminilidades, possibilitando a emergência de um "jogo de gênero", no qual diferentes modos de ser atleta foram representados.

  8. Wineries Evaluation of Costs and Benefits of Sustainability Certification Program: The Case of Terra Vitis in France.

    Science.gov (United States)

    Jourjon, Frederique; Chou, Hsia-Chi; Gezart, Anna; Kadison, Amy E; Martinat, Lea; Pomarici, Eugenio; Vecchio, Riccardo

    2016-01-01

    The current paper analyses the evaluation of the costs and benefits of French wineries (N=69) participating in the sustainability program Terra Vitis, a widespread environmental certification scheme within the French wine industry. An online questionnaire was sent to all Terra Vitis participants, in order to analyse the evaluation of economic costs and benefits (together with environmental benefits) as perceived by wineries. Our findings reveal that older participants in the scheme (over 5 years), firms with higher export share (>40% of annual turnover) and cooperative wineries tend to be keener to assign a positive evaluation to the benefits/costs ratio in both the vineyard and the winery. In the context of increasing concerns regarding the economic and environmental performance of the French agricultural sector, such findings and also the patent research could be useful for policy makers and entrepreneurs in defining mainstream normative and corporate strategies. Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.org.

  9. A TERRITORIALIDADE DOS MOVIMENTOS SOCIAIS QUE LUTAM POR TERRA E REFORMA AGRÁRIA NO PONTAL DO PARANAPANEMA

    Directory of Open Access Journals (Sweden)

    Edvaldo Carlos de Lima

    2012-04-01

    Full Text Available Para apreendermos a mobilização da classe trabalhadora no campo, no âmbito da luta eresistência na terra no Brasil, é preciso refletir, entre outros, sobre dois fenômenos: o latifúndio e osmovimentos sociais rurais, sendo o primeiro a base propulsora do segundo. Especificamente nestetexto, apontamos um diagnóstico das dissensões (discrepâncias e dissidências (separações pordivergências políticas dos Movimentos Sociais que Lutam pela Terra e pela Reforma Agrária(MSLTRA na região do Pontal do Paranapanema, com especial atenção aos seus desdobramentosterritoriais.

  10. Visual analytics for semantic queries of TerraSAR-X image content

    Science.gov (United States)

    Espinoza-Molina, Daniela; Alonso, Kevin; Datcu, Mihai

    2015-10-01

    With the continuous image product acquisition of satellite missions, the size of the image archives is considerably increasing every day as well as the variety and complexity of their content, surpassing the end-user capacity to analyse and exploit them. Advances in the image retrieval field have contributed to the development of tools for interactive exploration and extraction of the images from huge archives using different parameters like metadata, key-words, and basic image descriptors. Even though we count on more powerful tools for automated image retrieval and data analysis, we still face the problem of understanding and analyzing the results. Thus, a systematic computational analysis of these results is required in order to provide to the end-user a summary of the archive content in comprehensible terms. In this context, visual analytics combines automated analysis with interactive visualizations analysis techniques for an effective understanding, reasoning and decision making on the basis of very large and complex datasets. Moreover, currently several researches are focused on associating the content of the images with semantic definitions for describing the data in a format to be easily understood by the end-user. In this paper, we present our approach for computing visual analytics and semantically querying the TerraSAR-X archive. Our approach is mainly composed of four steps: 1) the generation of a data model that explains the information contained in a TerraSAR-X product. The model is formed by primitive descriptors and metadata entries, 2) the storage of this model in a database system, 3) the semantic definition of the image content based on machine learning algorithms and relevance feedback, and 4) querying the image archive using semantic descriptors as query parameters and computing the statistical analysis of the query results. The experimental results shows that with the help of visual analytics and semantic definitions we are able to explain

  11. Calidifontibacter terrae sp. nov., an actinomycete isolated from soil, with potential applications in cosmetics.

    Science.gov (United States)

    Dahal, Ram Hari; Shim, Dong Seop; Kim, Joon Young; Kim, Jaisoo

    2017-06-01

    An aerobic, Gram-stain-positive, oxidase- and catalase-positive, non-motile, non-spore-forming, coccoid, creamish-white-coloured bacterium, designated strain R161T, was isolated from soil in Hwaseong, South Korea. The cell-wall peptidoglycan contained glycine, glutamic acid, alanine, aspartic acid, serine and lysine, and whole-cell sugars were galactose, rhamnose, glucose and ribose. Strain R161T showed antibacterial and enzyme inhibitory activities. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that strain R161T formed a lineage within the family Dermacoccaceae, and showed highest sequence similarity with type strains of Calidifontibacter indicus PC IW02T (97.71 % sequence similarity) and Yimella lutea YIM 45900T (97.58 %). The sequence similarity of strain R161T with type strains of members of the genus Dermacoccus was less than 96.5 %. The major menaquinone was MK-8(H4). The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and phosphatidylinositol mannosides. The major cellular fatty acids were iso-C16 : 0, anteiso-C17 : 0, iso-C16 : 1 H, anteiso-C17 : 1ω9c, summed feature 9 (iso-C17 : 1ω9c and/or C16 : 0 10-methyl) and iso-C15 : 0. The DNA G+C content of strain R161T was 73.9 mol%. The DNA-DNA hybridization value between strain R161T and C. indicus JCM 16038T was 52.1 %. On the basis of phenotypic, genotypic, chemotaxonomic and phylogenetic analysis, strain R161T represents a novel species of genus Calidifontibacter, for which the name Calidifontibacter terrae sp. nov. is proposed. The type strain of Calidifontibacter terrae sp. nov. is R161T (=KEMB 9005-404T=KACC 18906T=JCM 31558T).

  12. Polar cap absorption events of November 2001 at Terra Nova Bay, Antarctica

    Directory of Open Access Journals (Sweden)

    L. Perrone

    2004-04-01

    Full Text Available Polar cap absorption (PCA events recorded during November 2001 are investigated by observations of ionospheric absorption of a 30MHz riometer installed at Terra Nova Bay (Antarctica, and of solar proton flux, monitored by the NOAA-GOES8 satellite in geo-synchronous orbit. During this period three solar proton events (SPE on 4, 19 and 23 November occurred. Two of these are among the dozen most intense events since 1954 and during the current solar cycle (23rd, the event of 4 November shows the greatest proton flux at energies >10MeV. Many factors contribute to the peak intensity of the two SPE biggest events, one is the Coronal Mass Ejection (CME speed, other factors are the ambient population of SPE and the shock front due to the CME. During these events absorption peaks of several dB (~20dB are observed at Terra Nova Bay, tens of minutes after the impact of fast halo CMEs on the geomagnetic field.

    Results of a cross-correlation analysis show that the first hour of absorption is mainly produced by 84–500MeV protons in the case of the 4 November event and by 15–44MeV protons for the event of 23 November, whereas in the entire event the contribution to the absorption is due chiefly to 4.2–82MeV (4 November and by 4.2–14.5MeV (23 November. Good agreement is generally obtained between observed and calculated absorption by the empirical flux-absorption relationship for threshold energy E0=10MeV. From the residuals one can argue that other factors (e.g. X-ray increases and geomagnetic disturbances can contribute to the ionospheric absorption.

    Key words. Ionosphere (Polar Ionosphere, Particle precipitation – Solar physics (Flares and mass ejections

  13. Is The East Antarctic Ice Sheet Stable? New Aerogeophysical Evidence from Terra Adelie

    Science.gov (United States)

    Durand, G.; Young, D. A.; Le Meur, E.; Blankenship, D. D.; Garcia-Aznar, P.

    2011-12-01

    Recently collected ice thickness data, collected as part of NASA's Operation Ice Bridge, provide insight into the sea level rise potential of the Terra Adelie/George V Land sector of East Antarctica. We compare the bedrock geometry unveiled over Ninnis Glacier and the ice streams feeding Cook Ice Shelf in this region to that of the major glaciers of West Antarctica. We find that many aspects of the bedrock geometry are comparable between the two regions. Rapid acceleration of West Antarctic's outlet glaciers and consequent ice loss (known as dynamic thinning) has been observed since the mid nineties. As a consequence, the West Antarctic Ice Sheet is out of balance and contributes increasingly to the current sea level rise. Due to West Antarctica's inward sloping bed geometry, continued and accelerating ice loss is predicted due to the effects of the Marine Ice Sheet Instability (MISI). Weertman [1974] suggested that marine terminated outlet glaciers may present an intrinsic instability when they rest over a seaward up-sloping bedrock. This principle was recently demonstrated in for the 2D flow line models and further confirmed through numerical investigations. The Amundsen sea sector of West Antarctica (more particularly Pine Island and Thwaites Glaciers) undergoes a significant increase of its grounded ice discharge along with grounding line retreats of up to tens of kilometers. Amongst the difficulties in forecasting the future ice sheet contribution to sea level is the determining whether the current shrinkage of West Antarctic glaciers can persist due to MISI. On the other hand, even if dynamical thinning has been recently observed over some outlets (particularly between 90° and 165° E), mass balance of East Antarctica seems currently to be in equilibrium. Due to that fact and to the vast scale of East Antarctica, surveys to determine bedrock elevation have received much less attention than West Antarctica, particularly in the Terra Adelie region. It is

  14. Seismic sources near Jang Bogo Station, Terra Nova Bay, East Antarctica

    Science.gov (United States)

    Kong, C.; Kang, T. S.

    2016-12-01

    The Jang Bogo Research Station is the second Korean Antarctic base which was build in Terra Nova Bay, Victoria Land, in the southeastern part of Antarctica in 2014. For the purpose of monitoring various natural seismic signals as well as local earthquakes in and around the station, two broadband seismographs were installed within the station compound and were operated during the second overwintering period from December 2014 to November 2015. Seismic data were continuously recorded during the period, and thus they might deliver much of information on the natural and artificial phenomena in the vicinity of the station. From both the temporal and spectral analyses, it was revealed that the continuous data are consisted of various types of event waveforms which are strongly correlated with variety of seismic sources. Event waveforms are classified into major four categories in accordance with their origin: tectonic earthquakes, volcanic earthquakes, cryogenic events such as icequakes, and atmospheric perturbation. Besides typical waveforms from local and teleseismic earthquakes, local volcano-related signals are expected. A prime source of those signals is Mt. Melbourne which is the only active volcano on the Antarctic mainland and is located in about 30 km northeast of the Jang Bogo station. While no magma eruption occurred during the overwinter period, phreatic eruptions of gases at the summit of Mt. Melbourne were observed sporadically. Seismic sources of the ice-related signal are associated with the Campbell glacier which is originated from the end of Mesa Range in Victoria Land. The Campbell glacier flows into Terra Nova Bay in Ross Sea and forms Campbell ice tongue that is a seaward extension of the glacier. The fast-flowing movement of the glacier appears to generate seismic signals observed at the station. Sometimes katabatic winds, which are downslope winds transiently blowing from Mt. Browning during the Antarctic winter period, massaged the ground and thus

  15. The Western Noachis Terra Chloride Deposits: An Improved Characterization of the Proposed Human Exploration Zone

    Science.gov (United States)

    Hill, J. R.; Plaut, J. J.; Christensen, P. R.

    2016-12-01

    At the First Landing Site and Exploration Zone Workshop for Human Missions to the Surface of Mars (Oct 27-30, 2015, Houston, TX), planetary scientists, students and members of the public proposed forty-seven sites that meet the engineering requirements for a human mission and would also allow astronauts to investigate important scientific questions while on the surface. The chloride deposits in western Noachis Terra at -37.2°N, 350.5°E were proposed as a potential exploration zone due to their proximity to craters containing glacier-like forms and imperfectly-formed concentric crater fill. The high astrobiological preservation potential of the chloride deposits exposed on the surface would allow astronauts to investigate the past habitability of a well-preserved Noachian fluvial system, while the subsurface ice features suggest astronauts would have relatively easy access to enough water to meet the requirements of NASA's current baseline mission architecture. Since the workshop, the proposed exploration zone has been further characterized using additional datasets, as well as new data collected by the Mars Reconnaissance Orbiter as part of the exploration zone data acquisition effort organized by NASA's Human Landing Sites Study (HLS2) team. First, SHARAD radar data were used to constrain the subsurface structure of the imperfectly-formed concentric crater fill within the two large craters, which makes a more accurate assessment of the potential subsurface water ice resources possible. Second, newly acquired HiRISE images were used to better assess the traversability of the terrain between the habitation zone and the primary resource and science regions-of-interest (ROIs). And third, the exploration zone was shifted in order to place the central landing site closer to potential subsurface water ice resources. Although this would require crews to travel further to investigate the chloride deposits, it reduces the distance between the subsurface water ice

  16. Validation of JAXA/MODIS Sea Surface Temperature in Water around Taiwan Using the Terra and Aqua Satellites

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    Ming-An Lee

    2010-01-01

    Full Text Available The research vessel-based Conductivity Temperature Depth profiler (CTD provides underwater measurements of the bulk sea surface temperature (SST at the depths of shallower than 5 m. The CTD observations of the seas around Taiwan provide useful data for comparison with SST of MODIS (Moderate Resolution Imaging Spectroradiometers aboard Aqua and Terra satellites archived by JAXA (Japan Aerospace Exploration Agency. We produce a high-resolution (1 km MODIS SST by using Multi-Channel SST (MCSST algorithm. There were 1516 cloud-free match-up data pairs of MODIS SST and in situ measurements during the period from 2003 - 2005. The difference of the root mean square error (RMSE of satellite observations from each platform during the day and at night was: 0.88°C in Aqua daytime, 0.71°C in Aqua nighttime, 0.71°C in Terra daytime, and 0.60°C in Terra nighttime. The total analysis of MODIS-derived SST shows good agreement with a bias of 0.03°C and RMSE of 0.75°C. The analyses indicate that the bias of Aqua daytime was always positive throughout the year and the large RMSE should be attributed to the large positive bias (0.45°C under diurnal warming. It was also found that the bias of Terra daytime was usually negative with a mean bias of -0.41°C; its large RMSE should be treated with care because of low solar radiation in the morning.

  17. Necessidades hídricas de bananeira tipo Terra em condições de tabuleiros costeiros

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    Eugênio Ferreira Coelho

    2013-09-01

    Full Text Available O objetivo deste trabalho foi avaliar os efeitos de diferentes lâminas de água nas variáveis morfofisiológicas e de produção de três cultivares de bananeira do tipo Terra. Utilizou-se o delineamento experimental de blocos ao acaso, em arranjo fatorial com 12 tratamentos e três repetições. Os tratamentos consistiram de lâminas de água correspondentes a 33, 66, 99 e 120% da evapotranspiração da cultura (ETc, além do controle sem irrigação, e das cultivares Terra Maranhão, Terrinha e D'Angola. Avaliaram-se as variáveis morfofisiológicas: altura de planta, diâmetro do pseudocaule, área foliar, condutância estomática e, na colheita, número de dedos e de pencas, e peso de pencas por cacho. Os coeficientes de cultura das cultivares de bananeira tipo Terra foram obtidos a partir da melhor combinação de produtividade e eficiência de uso de água. As lâminas de água de uso consuntivo de 1.599 mm (1,20 da ETc, 922 mm (0,84 da ETc e 940 mm (1,06 da ETc correspondem às máximas produtividades e eficiências de uso de água das cultivares Terra Maranhão, Terrinha e D'Angola, respectivamente.

  18. Telomeric Repeat-Containing RNAs (TERRA) Decrease in Squamous Cell Carcinoma of the Head and Neck Is Associated with Worsened Clinical Outcome.

    Science.gov (United States)

    Vitelli, Valerio; Falvo, Paolo; G Nergadze, Solomon; Santagostino, Marco; Khoriauli, Lela; Pellanda, Paola; Bertino, Giulia; Occhini, Antonio; Benazzo, Marco; Morbini, Patrizia; Paulli, Marco; Porta, Camillo; Giulotto, Elena

    2018-01-17

    Telomeres are transcribed into noncoding telomeric repeat-containing RNAs (TERRA), which are essential for telomere maintenance. Deregulation of TERRA transcription impairs telomere metabolism and a role in tumorigenesis has been proposed. Head and neck cancer (HNC) is one of the most frequent cancers worldwide, with head and neck squamous cell carcinoma (HNSCC) being the predominant type. Since HNSCC patients are characterized by altered telomere maintenance, a dysfunction in telomere transcription can be hypothesized. In this prospective study, we compared TERRA levels in the tumor and matched normal tissue from 23 HNSCC patients. We then classified patients in two categories according to the level of TERRA expression in the tumor compared to the normal tissue: (1) lower expression in the tumor, (2) higher or similar expression in tumor. A significant proportion of patients in the first group died of the disease within less than 34 months postsurgery, while the majority of patients in the second group were alive and disease-free. Our results highlight a striking correlation between TERRA expression and tumor aggressiveness in HNSCC suggesting that TERRA levels may be proposed as a novel molecular prognostic marker for HNSCC.

  19. Plastic roles of phenylalanine and tyrosine residues of TLS/FUS in complex formation with the G-quadruplexes of telomeric DNA and TERRA.

    Science.gov (United States)

    Kondo, Keiko; Mashima, Tsukasa; Oyoshi, Takanori; Yagi, Ryota; Kurokawa, Riki; Kobayashi, Naohiro; Nagata, Takashi; Katahira, Masato

    2018-02-12

    The length of a telomere is regulated via elongation and shortening processes. Telomeric DNA and telomeric repeat-containing RNA (TERRA), which both contain G-rich repeated sequences, form G-quadruplex structures. Previously, translocated in liposarcoma (TLS) protein, also known as fused in sarcoma (FUS) protein, was found to form a ternary complex with the G-quadruplex structures of telomeric DNA and TERRA. We then showed that the third RGG motif of TLS, the RGG3 domain, is responsible for the complex formation. However, the structural basis for their binding remains obscure. Here, NMR-based binding assaying revealed the interactions in the binary and ternary complexes of RGG3 with telomeric DNA or/and TERRA. In the ternary complex, tyrosine bound exclusively to TERRA, while phenylalanine bound exclusively to telomeric DNA. Thus, tyrosine and phenylalanine each play a central role in the recognition of TERRA and telomeric DNA, respectively. Surprisingly in the binary complexes, RGG3 used both tyrosine and phenylalanine residues to bind to either TERRA or telomeric DNA. We propose that the plastic roles of tyrosine and phenylalanine are important for RGG3 to efficiently form the ternary complex, and thereby regulate the telomere shortening.

  20. Uma análise do encanto e da luta pela terra dos indígenas em diferentes territorialidades

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    Nathalia Cunha Polese

    2015-05-01

    Full Text Available O presente estudo tem por objetivo discutir acerca do território indígena, mitologias, constituição e apropriação da terra. Em um exercício de retomada de consciência de quem são os verdadeiros donos da terra tentaremos postular em que lugar o indígena se encontra em uma sociedade globalizada e globalizante como a ocidental. Através de estudos, memórias, dados etnográficos e narrativas elaboradas por indígenas e não indígenas, iremos adentrar neste território de conflitos, identidades e significações. No Brasil, nós convivemos com este “drama” acompanhando através da mídia relatos sobre estes conflitos, onde o branco se faz dono de uma terra que julga sua e se apropria dela como é conveniente para si. Por ser um tema central, a discussão do que é esse território e como estamos postulando o mesmo se torna fundamental e será a base da análise realizada.

  1. Mapping of Bare Soil Surface Parameters (Moisture, Roughness, Texture) from one TerraSAR-X Radar Configuration

    Science.gov (United States)

    Zribi, Mehrez; Gorrab, Azza; Baghdadi, Nicolas; Chabaane, Zohra Lili

    2016-08-01

    In this paper, surface bare soil parameters (moisture, roughness and texture) mapping was carried out in central Tunisia (North Africa) using one TerraSAR-X radar configuration (one incidence angle, one polarization). Firstly, we analyzed statistically the relationships between TerraSAR-X backscattering signals function of soil moisture and different roughness parameters (the root mean square height Hrms, the Zs and the Zg parameters) at 36° and HH polarization. Results have shown a high sensitivity of real radar data to all soil parameters. Then, we proposed an algorithm combing the TerraSAR-X images with different continuous thetaprobe measurements for the retrieval of surface soil moisture. Empirical relationship was established between the mean moisture values retrieved from the SAR images and the percentage of clay over 36 test fields. Validation of the proposed approach was carried out over a second set of 34 fields, showing that highly accurate clay estimations can be achieved. Finally, for spatial and temporal surface roughness estimation, we proposed empirical relationships between radar and soil roughness parameters (Hrms and Zg parameters). The proposed model was calibrated over 39 test fields, and then validated over 40 other plots.

  2. Development and Implementation of an Electronic Crosstalk Correction for Bands 27–30 in Terra MODIS Collection 6

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    Truman Wilson

    2017-06-01

    Full Text Available The photovoltaic bands on the long-wave infrared focal plane assembly of Terra MODIS, bands 27–30, have suffered from steadily increasing contamination from electronic crosstalk as the mission has progressed. This contamination has a great impact on MODIS data products, including image striping and radiometric bias in the Level-1B calibrated radiance product, and incorrect retrieval in atmospheric products that rely on data from bands 27–30, such as the cloud mask and cloud particle phase products. In this work, we describe the development of an electronic crosstalk correction for bands 27–30 of Terra MODIS using observations of the Moon. In this approach, the derived correction coefficients account for both the “in-band” and “out-of-band” contribution to the signal contamination, which is not considered in previous implementations of the lunar-based correction. The correction coefficients are applied to both the on-board calibrator data and the Earth-view data, resulting in a significant reduction in the image striping and radiometric bias in the Level-1B data, as well as a better performance in the Level-2 cloud mask and cloud particle phase products. This approach will be implemented for Terra MODIS Collection 6 in 2017.

  3. Terra-Preta-Technology as an innovative system component to create circulation oriented, sustainable land use systems

    Science.gov (United States)

    Dotterweich, M.; Böttcher, J.; Krieger, A.

    2012-04-01

    This paper presents current research and application projects on innovative system solutions which are based on the implementation of a regional resource efficient material flow management as well as utilising "Terra-Preta-Technology" as an innovative system component. Terra Preta Substrate (TPS) is a recently developed substance composed of liquid and solid organic matter, including biochar, altered by acid-lactic fermentation. Based on their properties, positive effects on water and nutrient retention, soil microbiological activity, and cation-exchange capacity are expected and currently investigated by different projects. TPS further sequesters carbon and decreases NO2 emissions from fertilized soils as observed by the use of biochar. The production of TPS is based on a circulation oriented organic waste management system directly adapted to the local available inputs and desired soil amendment properties. The production of TPS is possible with simple box systems for subsistence farming but also on a much larger scale as modular industrial plants for farmers or commercial and municipal waste management companies in sizes from 500 and 50,000 m3. The Terra-Preta-Technology enhances solutions to soil conservation, soil amelioration, humic formation, reduced water consumption, long term carbon sequestration, nutrient retention, containment binding, and to biodiversity on local to a regional scale. The projects also involve research of ancient land management systems to enhance resource efficiency by means of an integrative and transdisciplinary approach.

  4. Impacts of Cross-Platform Vicarious Calibration on the Deep Blue Aerosol Retrievals for Moderate Resolution Imaging Spectroradiometer Aboard Terra

    Science.gov (United States)

    Jeong, Myeong-Jae; Hsu, N. Christina; Kwiatkowska, Ewa J.; Franz, Bryan A.; Meister, Gerhard; Salustro, Clare E.

    2012-01-01

    The retrieval of aerosol properties from spaceborne sensors requires highly accurate and precise radiometric measurements, thus placing stringent requirements on sensor calibration and characterization. For the Terra/Moderate Resolution Imaging Spedroradiometer (MODIS), the characteristics of the detectors of certain bands, particularly band 8 [(B8); 412 nm], have changed significantly over time, leading to increased calibration uncertainty. In this paper, we explore a possibility of utilizing a cross-calibration method developed for characterizing the Terral MODIS detectors in the ocean bands by the National Aeronautics and Space Administration Ocean Biology Processing Group to improve aerosol retrieval over bright land surfaces. We found that the Terra/MODIS B8 reflectance corrected using the cross calibration method resulted in significant improvements for the retrieved aerosol optical thickness when compared with that from the Multi-angle Imaging Spectroradiometer, Aqua/MODIS, and the Aerosol Robotic Network. The method reported in this paper is implemented for the operational processing of the Terra/MODIS Deep Blue aerosol products.

  5. On the Relative Stability of CERES Reflected Shortwave and MISR and MODIS Visible Radiance Measurements During the Terra Satellite Mission

    Science.gov (United States)

    Corbett, J. G.; Loeb, N. G.

    2015-01-01

    Fifteen years of visible, near-infrared, and broadband shortwave radiance measurements from Clouds and the Earth's Radiant Energy System (CERES), Multiangle Imaging Spectroradiometer (MISR), and Moderate Resolution Imaging Spectroradiometer (MODIS) instruments on board NASA's Terra satellite are analyzed in order to assess their long-term relative stability for climate purposes. A regression-based approach between CERES, MODIS, and MISR (An camera only) reflectances is used to calculate the bias between the different reflectances relative to a reference year. When compared to the CERES shortwave broadband reflectance, relative drift between the MISR narrowbands is within 1%/decade. Compared to the CERES shortwave reflectance, the MODIS narrowband reflectances show a relative drift of less than -1.33%/decade. When compared to MISR, the MODIS reflectances show a relative drift of between -0.36%/decade and -2.66%/decade. We show that the CERES Terra SW measurements are stable over the time period relative to CERES Aqua. Using this as evidence that CERES Terra may be absolutely stable, we suggest that the CERES, MISR, and MODIS instruments meet the radiometric stability goals for climate applications set out in Ohring et al. (2005).

  6. Discovery of selective ligands for telomeric RNA G-quadruplexes (TERRA) through 19F-NMR based fragment screening.

    Science.gov (United States)

    Garavís, Miguel; López-Méndez, Blanca; Somoza, Alvaro; Oyarzabal, Julen; Dalvit, Claudio; Villasante, Alfredo; Campos-Olivas, Ramón; González, Carlos

    2014-07-18

    Telomeric repeat-containing RNA (TERRA) is a novel and very attractive antitumoral target. Here, we report the first successful application of (19)F-NMR fragment-based screening to identify chemically diverse compounds that bind to an RNA molecule such as TERRA. We have built a library of 355 fluorinated fragments, and checked their interaction with a long telomeric RNA as a target molecule. The screening resulted in the identification of 20 hits (hit rate of 5.6%). For a number of binders, their interaction with TERRA was confirmed by (19)F- and (1)H NMR as well as by CD melting experiments. We have also explored the selectivity of the ligands for RNA G-quadruplexes and found that some of the hits do not interact with other nucleic acids such as tRNA and duplex DNA and, most importantly, favor the propeller-like parallel conformation in telomeric DNA G-quadruplexes. This suggests a selective recognition of this particular quadruplex topology and that different ligands may recognize specific sites in propeller-like parallel G-quadruplexes. Such features make some of the resulting binders promising lead compounds for fragment based drug discovery.

  7. Influência do preparo do solo sôbre a estrutura da terra-roxa-legítima Influence of tillage practices on the structure of the terra-roxa-legítima

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    F. Grohmann

    1961-01-01

    Full Text Available Com a finalidade de verificar o efeito do preparo do solo sôbre a estrutura da terra-roxa-Iegítima, utilizaram-se amostrai de solo, de um ensaio de preparo de solo, instalado pela Seção de Conservação do Solo, ensaio êsse que foi repetido durante 12 anos. Os resultados analíticos mostram que, para o caso especial da terra-roxa-legitima, solo bastante estruturado, o trabalho mecânico, quando muito intensa, faz com que o diâmetro médio geométrico dos agregados fique bastante reduzido. No tratamento com duas arações, os agregados apresentaram um diâmetro médio geométrico de 0,54 milímetros, enquanto que nos tratamentos com uma aração apenas e preparo de solo com enxada, os diâmetros eram da ordem de 0.70 e 0,95 milímetros, respectivamente. Num solo como a terra-roxa-legítima a estrutura apresenta-se melhor quando no seu preparo faz-se uma aração ao invés de duas. Um revolvimento moderado é recomendado para manter êste tipo de solo com boas características e bom preparo.Soil samples taken from experimenial plots that had been submitted to different tillage practices tor 13 years were used for studies os their structure. The results obtained showed that for the terra-roxa-legilima, a soil highly structured, intensive tillage practices reduced the diameter (geometric mean of soil aggregates. For the two-plowing treatment the diameter of the aggregates was 0.45 mm, whereas for the one-plowing and hoeing treatments their sizes were 0.70 mm and 0.95 mm, respectively. Taking the soil structure into consideration, it is concluded that for the terra-roxa-legítima, moderate tillage paclices are to be recommended.

  8. High WT1 expression is an early predictor for relapse in patients with acute promyelocytic leukemia in first remission with negative PML-RARa after anthracycline-based chemotherapy: a single-center cohort study

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    Jae-Ho Yoon

    2017-01-01

    Full Text Available Abstract Wilms’ tumor gene 1 (WT1 expression is a well-known predictor for relapse in acute myeloid leukemia. We monitored WT1 decrement along the treatment course to identify its significant role as a marker for residual disease in acute promyelocytic leukemia (APL and tried to suggest its significance for relapse prediction. In this single center retrospective study, we serially measured PML-RARa and WT1 expression from 117 APL patients at diagnosis, at post-induction and post-consolidation chemotherapies, and at every 3 months after starting maintenance therapy. All 117 patients were in molecular remission after treatment of at least 2 consolidation chemotherapies. We used WT1 ProfileQuant™ kit (Ipsogen for WT1 monitoring. High WT1 expression (>120 copies/104 ABL1 after consolidation and at early period (3 months after maintenance therapy significantly predicted subsequent relapse. All paired PML-RARa RQ-PCR were not detected except for one sample with early relapse. Patients with high WT1 expression at 3 months after maintenance therapy (n = 40 showed a significantly higher relapse rate (30.5 vs. 6.9%, P < 0.001 and inferior disease free survival (62.8 vs. 91.4%, P < 0.001. Multivariate analysis revealed that high peak leukocyte counts at diagnosis (HR = 6.4, P < 0.001 and high WT1 expression at 3 months after maintenance therapy (HR = 7.1, P < 0.001 were significant factors for prediction of relapse. Our data showed high post-remission WT1 expression was a reliable marker for prediction of subsequent molecular relapse in APL. In this high-risk group, early intervention with ATRA ± ATO, anti-CD33 antibody therapy, and WT1-specific therapy may be used for relapse prevention. Trial registration Clinical Research Information Service (CRIS, KCT0002079

  9. Assessment of the Short-Term Radiometric Stability between Terra MODIS and Landsat 7 ETM+ Sensors

    Science.gov (United States)

    Choi, Taeyoung; Xiong, Xiaxiong; Chander, G.; Angal, Amit

    2009-01-01

    The Landsat 7 (L7) Enhanced Thematic Mapper (ETM+) sensor was launched on April 15th, 1999 and has been in operation for over nine years. It has six reflective solar spectral bands located in the visible and shortwave infrared part of the electromagnetic spectrum (0.5 - 2.5 micron) at a spatial resolution of 30 m. The on-board calibrators are used to monitor the on-orbit sensor system changes. The ETM+ performs solar calibrations using on-board Full Aperture Solar Calibrator (FASC) and the Partial Aperture Solar Calibrator (PASC). The Internal Calibrator Lamp (IC) lamps, a blackbody and shutter optics constitute the on-orbit calibration mechanism for ETM+. On 31 May 2003, a malfunction of the scan-line corrector (SLC) mirror assembly resulted in the loss of approximately 22% of the normal scene area. The missing data affects most of the image with scan gaps varying in width from one pixel or less near the centre of the image to 14 pixels along the east and west edges of the image, creating a wedge-shaped pattern. However, the SLC failure has no impacts on the radiometric performance of the valid pixels. On December 18, 1999, the Moderate Resolution Imaging Spectroradiometer (MODIS) Proto-Flight Model (PFM) was launched on-board the NASA's EOS Terra spacecraft. Terra MODIS has 36 spectral bands with wavelengths ranging from 0.41 to 14.5 micron and collects data over a wide field of view angle (+/-55 deg) at three nadir spatial resolutions of 250 m, 500 in 1 km for bands 1 to 2, 3 to 7, and 8 to 36, respectively. It has 20 reflective solar bands (RSB) with spectral wavelengths from 0.41 to 2.1 micron. The RSB radiometric calibration is performed by using on-board solar diffuser (SD), solar diffuser stability monitor (SDSM), space-view (SV), and spectro-radiometric calibration assembly (SRCA). Through the SV port, periodic lunar observations are used to track radiometric response changes at different angles of incidence (AOI) of the scan mirror. As a part of the AM

  10. Assessment of Terra MODIS On-Orbit Polarization Sensitivity Using Pseudoinvariant Desert Sites

    Science.gov (United States)

    Wu, Aisheng; Geng, Xu; Wald, Andrew; Angal, Amit; Xiong, Xiaoxiong

    2017-01-01

    The Moderate Resolution Imaging Spectroradiometer (MODIS) is currently flying on NASA's Earth Observing System Terra and Aqua satellites, launched in 1999 and 2002, respectively. MODIS reflective solar bands in the visible wavelength range are known to be sensitive to polarized light based on prelaunch polarization sensitivity tests. After about five years of on-orbit operations, it was discovered that the polarization sensitivity at short wavelengths had shown a noticeable increase. In this paper, we examine the impact of polarization on measured top-of-atmosphere (TOA) reflectance based on MODIS Collection-6 L1B over pseudo invariant desert sites. The standard polarization correction equation is used in combination with simulated at-sensor radiances using the second simulation of a satellite signal in the Solar Spectrum, Vector Radiative Transfer Code (6SV). We ignore the polarization contribution from the surface and a ratio approach is used for both 6SV-derived in put parameters and observed TOA reflectance. Results indicate that significant gain corrections up to 25% are required near the end of scan for the 412 and 443 nm bands. The polarization correction reduces the seasonal fluctuations in reflectance trends and mirror side ratios from 30% and 12% to 10% and 5%, respectively, for the two bands. Comparison of the effectiveness of the polarization correction with the results from the NASA Ocean Biology Processing Group shows a good agreement in the corrected reflectance trending results and their seasonal fluctuations.

  11. Social vulnerability and climate variability in southern Brazil: a TerraPop case study

    Science.gov (United States)

    Adamo, S. B.; Fitch, C. A.; Kugler, T.; Doxsey-Whitfield, E.

    2014-12-01

    Climate variability is an inherent characteristic of the Earth's climate, including but not limited to climate change. It affects and impacts human society in different ways, depending on the underlying socioeconomic vulnerability of specific places, social groups, households and individuals. This differential vulnerability presents spatial and temporal variations, and is rooted in historical patterns of development and relations between human and ecological systems. This study aims to assess the impact of climate variability on livelihoods and well-being, as well as their changes over time and across space, and for rural and urban populations. The geographic focus is Southern Brazil-the states of Parana, Santa Catarina and Rio Grande do Sul-- and the objectives include (a) to identify and map critical areas or hotspots of exposure to climate variability (temperature and precipitation), and (b) to identify internal variation or differential vulnerability within these areas and its evolution over time (1980-2010), using newly available integrated data from the Terra Populus project. These data include geo-referenced climate and agricultural data, and data describing demographic and socioeconomic characteristics of individuals, households and places.

  12. Monitoring of rapid land cover changes in eastern Japan using Terra/MODIS data

    Science.gov (United States)

    Harada, I.; Hara, K.; Park, J.; Asanuma, I.; Tomita, M.; Hasegawa, D.; Short, K.; Fujihara, M.,

    2015-04-01

    Vegetation and land cover in Japan are rapidly changing. Abandoned farmland in 2010, for example, was 396,000 ha, or triple that of 1985. Efficient monitoring of changes in land cover is vital to both conservation of biodiversity and sustainable regional development. The Ministry of Environment is currently producing 1/25,000 scale vegetation maps for all of Japan, but the work is not yet completed. Traditional research is time consuming, and has difficulty coping with the rapid nature of change in the modern world. In this situation, classification of various scale remotely sensed data can be of premier use for efficient and timely monitoring of changes in vegetation.. In this research Terra/MODIS data is utilized to classify land cover in all of eastern Japan. Emphasis is placed on the Tohoku area, where large scale and rapid changes in vegetation have occurred in the aftermath of the Great Eastern Japan Earthquake of 11 March 2011. Large sections of coastal forest and agricultural lands, for example, were directly damaged by the earthquake or inundated by subsequent tsunami. Agricultural land was also abandoned due to radioactive contamination from the Fukushima nuclear power plant accident. The classification results are interpreted within the framework of a Landscape Transformation Sere model developed by Hara et al (2010), which presents a multi-staged pattern for tracking vegetation changes under successively heavy levels of human interference. The results of the research will be useful for balancing conservation of biodiversity and ecosystems with the needs for regional redevelopment.

  13. Cellulomonas terrae sp. nov., a cellulolytic and xylanolytic bacterium isolated from soil.

    Science.gov (United States)

    An, Dong-Shan; Im, Wan-Taek; Yang, Hee-Chan; Kang, Myung Suk; Kim, Kwang Kyu; Jin, Long; Kim, Myung Kyum; Lee, Sung-Taik

    2005-07-01

    A bacterial strain (DB5(T)), with polysaccharide-degrading activities, was isolated from garden soil in Daejeon, Republic of Korea. The cells were Gram-positive, aerobic or facultatively anaerobic, non-motile straight rods. Phylogenetic analysis based on 16S rRNA gene sequences showed that this strain belongs to the genus Cellulomonas and that it is most closely related to Cellulomonas xylanilytica LMG 21723(T) and Cellulomonas humilata ATCC 25174(T) (98.0 and 97.9% similarity, respectively). Chemotaxonomic data also supported the classification of strain DB5(T) in the genus Cellulomonas, i.e. L-ornithine as the cell-wall diamino acid, anteiso-C(15:0) and iso-C(15:0) as the major fatty acids, MK-9(H(4)) as the predominant menaquinone and the presence of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and phosphatidylinositol mannosides in the polar lipid profile. The results of DNA-DNA hybridization in combination with chemotaxonomic and physiological data demonstrated that strain DB5(T) (=KCTC 19081(T)=NBRC 100819(T)) should be classified as the type strain of a novel species within the genus Cellulomonas, for which the name Cellulomonas terrae sp. nov. is proposed.

  14. Highly Heterogeneous Soil Bacterial Communities around Terra Nova Bay of Northern Victoria Land, Antarctica

    Science.gov (United States)

    Lim, Hyoun Soo; Hong, Soon Gyu; Kim, Ji Hee; Lee, Joohan; Choi, Taejin; Ahn, Tae Seok; Kim, Ok-Sun

    2015-01-01

    Given the diminished role of biotic interactions in soils of continental Antarctica, abiotic factors are believed to play a dominant role in structuring of microbial communities. However, many ice-free regions remain unexplored, and it is unclear which environmental gradients are primarily responsible for the variations among bacterial communities. In this study, we investigated the soil bacterial community around Terra Nova Bay of Victoria Land by pyrosequencing and determined which environmental variables govern the bacterial community structure at the local scale. Six bacterial phyla, Actinobacteria, Proteobacteria, Acidobacteria, Chloroflexi, Cyanobacteria, and Bacteroidetes, were dominant, but their relative abundance varied greatly across locations. Bacterial community structures were affected little by spatial distance, but structured more strongly by site, which was in accordance with the soil physicochemical compositions. At both the phylum and species levels, bacterial community structure was explained primarily by pH and water content, while certain earth elements and trace metals also played important roles in shaping community variation. The higher heterogeneity of the bacterial community structure found at this site indicates how soil bacterial communities have adapted to different compositions of edaphic variables under extreme environmental conditions. Taken together, these findings greatly advance our understanding of the adaption of soil bacterial populations to this harsh environment. PMID:25799273

  15. Miliardi e miliardi riflessioni di fine millennio sulla terra e i suoi inquilini

    CERN Document Server

    Sagan, Carl

    1998-01-01

    Carl Sagan, ancora una volta - l'ultima, purtroppo - ci mette a disposizione la sua esperienza (e le sue conoscenze) per vedere il mondo sotto una prospettiva diversa. Questa volta tuttavia, le domande a cui vuole dare risposta non sono soltanto scientifiche ma anche, soprattutto, umanistiche. Con gli occhiali dello scienziato, ma il cuore appassionato dell'uomo, Sagan affronta i temi che condizioneranno i nostri prossimi anni, dai piccoli - ma sorprendenti - problemi di ogni giorno, fino alle grandi domande sul futuro del Pianeta. Così, partendo dai servizi televisivi di Monday Night Football - una sorta di Domenica sportiva americana - Sagan ci accompagna fra le tribù dei cacciatori-raccoglitori che un tempo popolavano la Terra per arrivare a guardare da vicino il fragile equilibrio su cui poggia la vita. Allo stesso modo, prendendo spunto dall'invenzione degli scacchi, ci troviamo di fronte ai temi dell'esplosione demografica, della diffusione dell'Aids e a tutti quei fenomeni dove una piccola unità (un...

  16. Using the Surface Reflectance MODIS Terra Product to Estimate Turbidity in Tampa Bay, Florida

    Directory of Open Access Journals (Sweden)

    Douglas L. Rickman

    2010-12-01

    Full Text Available Turbidity is a commonly-used index of the factors that determine light penetration in the water column. Consistent estimation of turbidity is crucial to design environmental and restoration management plans, to predict fate of possible pollutants, and to estimate sedimentary fluxes into the ocean. Traditional methods monitoring fixed geographical locations at fixed intervals may not be representative of the mean water turbidity in estuaries between intervals, and can be expensive and time consuming. Although remote sensing offers a good solution to this limitation, it is still not widely used due in part to required complex processing of imagery. There are satellite-derived products, including the Moderate Resolution Imaging Spectroradiometer (MODIS Terra surface reflectance daily product (MOD09GQ Band 1 (620–670 nm which are now routinely available at 250 m spatial resolution and corrected for atmospheric effect. This study shows this product to be useful to estimate turbidity in Tampa Bay, Florida, after rainfall events (R2 = 0.76, n = 34. Within Tampa Bay, Hillsborough Bay (HB and Old Tampa Bay (OTB presented higher turbidity compared to Middle Tampa Bay (MTB and Lower Tampa Bay (LTB.

  17. Expressway deformation mapping using high-resolution TerraSAR-X images

    KAUST Repository

    Shi, Xuguo

    2014-01-27

    Monitoring deformation of linear infrastructures such as expressway and railway caused by natural processes or anthropogenic activities is a vital task to ensure the safety of human lives and properties. Interferometric Synthetic Aperture Radar (InSAR) has been widely recognized as an effective technology to carry out large-area surface deformation mapping. However, its application in linear infrastructure deformation monitoring has not been intensively studied till now. In this article, a modified Small BAseline Subset (SBAS) method is proposed to retrieve the deformation patterns of the expressway. In our method, only the point-like targets identified on the expressway were kept in our analysis, and two complementary subsets of interferograms were formed to better separate the signals of height error and deformation from inteferometric phase observations. We successfully applied this method with multitemporal high-resolution TerraSAR-X images to retrieve the spatialoral pattern of surface deformation along the Beian-Heihe expressway that is located in island-permafrost areas and threatened by geohazards. © 2014 Taylor & Francis.

  18. Inversion of Land Surface Temperature (LST Using Terra ASTER Data: A Comparison of Three Algorithms

    Directory of Open Access Journals (Sweden)

    Milton Isaya Ndossi

    2016-12-01

    Full Text Available Land Surface Temperature (LST is an important measurement in studies related to the Earth surface’s processes. The Advanced Space-borne Thermal Emission and Reflection Radiometer (ASTER instrument onboard the Terra spacecraft is the currently available Thermal Infrared (TIR imaging sensor with the highest spatial resolution. This study involves the comparison of LSTs inverted from the sensor using the Split Window Algorithm (SWA, the Single Channel Algorithm (SCA and the Planck function. This study has used the National Oceanic and Atmospheric Administration’s (NOAA data to model and compare the results from the three algorithms. The data from the sensor have been processed by the Python programming language in a free and open source software package (QGIS to enable users to make use of the algorithms. The study revealed that the three algorithms are suitable for LST inversion, whereby the Planck function showed the highest level of accuracy, the SWA had moderate level of accuracy and the SCA had the least accuracy. The algorithms produced results with Root Mean Square Errors (RMSE of 2.29 K, 3.77 K and 2.88 K for the Planck function, the SCA and SWA respectively.

  19. Literatura e Transdisciplinaridade: uma proposta de ensino a partir do romance Terra Papagalli

    Directory of Open Access Journals (Sweden)

    Rodolfo Meissner Rolando

    2015-01-01

    Full Text Available É inegável que a Educação, de um modo geral, enfrenta uma crise na contemporaneidade. E, naturalmente, as aulas de Língua Portuguesa e Literatura são afetadas por esse cenário. Devido a isso, muitos caminhos têm sido discutidos para a superação dos problemas vigentes e, sem dúvida, a transdisciplinaridade emerge como uma possibilidade instigante. Nesse sentido, o objetivo deste artigo é oferecer uma unidade didática transdisciplinar de ensino de Literatura para alunos do Ensino Médio. Para tanto, foi escolhido o romance contemporâneo Terra Papagalli, dos autores José Roberto Torero e Marcus Aurelius Pimenta, como corpus para a concretização de tal proposta. As sugestões aqui contidas foram embasadas, principalmente, nas proposições de Coelho (2000 a respeito de Literatura e Transdisciplinaridade e Paulino e Cosson (2009 sobre letramento literário. Em síntese, acredita-se que a proposta de ensino trazida por este artigo poderá auxiliar o professor de Língua Portuguesa a enfrentar os desafios impostos pela Educação no século XXI, além de contribuir para a realização do letramento literário.

  20. Floristic composition and community structure of epiphytic angiosperms in a terra firme forest in central Amazonia

    Directory of Open Access Journals (Sweden)

    Mariana Victória Irume

    2013-06-01

    Full Text Available This survey aimed to describe the floristic composition and structure of the epiphytic community occurring in a terra firme forest in the city of Coari, Brazil, in the Amazon region. Data collection was performed with a 1.5 ha plot method, with which upland, slope and lowland habitats were sampled. All angiosperm epiphytes and their host plants (diameter at breast height > 10 cm were sampled. We recorded 3.528 individuals in 13 families, 48 genera and 164 species. Araceae was the most prevalent family with regard to the importance value and stood out in all related parameters, followed by Bromeliaceae, Cyclanthaceae and Orchidaceae. The species with the highest epiphytic importance values were Guzmania lingulata (L. Mez. and Philodendron linnaei Kunth. The predominant life form was hemiepiphytic. Estimated floristic diversity was 3.2 (H'. The studied epiphytic community was distributed among 727 host plants belonging to 40 families, 123 genera and 324 species. One individual of Guarea convergens T.D. Penn. was the host with the highest richness and abundance of epiphytes. Stems/trunks of host plants were the most colonized segments, and the most favorable habitat for epiphytism was the lowlands, where 84.1% of species and 48.2% of epiphytic specimens were observed.

  1. Application of a Terrestrial LIDAR System for Elevation Mapping in Terra Nova Bay, Antarctica

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    Hyoungsig Cho

    2015-09-01

    Full Text Available A terrestrial Light Detection and Ranging (LIDAR system has high productivity and accuracy for topographic mapping, but the harsh conditions of Antarctica make LIDAR operation difficult. Low temperatures cause malfunctioning of the LIDAR system, and unpredictable strong winds can deteriorate data quality by irregularly shaking co-registration targets. For stable and efficient LIDAR operation in Antarctica, this study proposes and demonstrates the following practical solutions: (1 a lagging cover with a heating pack to maintain the temperature of the terrestrial LIDAR system; (2 co-registration using square planar targets and two-step point-merging methods based on extracted feature points and the Iterative Closest Point (ICP algorithm; and (3 a georeferencing module consisting of an artificial target and a Global Navigation Satellite System (GNSS receiver. The solutions were used to produce a topographic map for construction of the Jang Bogo Research Station in Terra Nova Bay, Antarctica. Co-registration and georeferencing precision reached 5 and 45 mm, respectively, and the accuracy of the Digital Elevation Model (DEM generated from the LIDAR scanning data was ±27.7 cm.

  2. Automated Waterline Detection in the Wadden Sea Using High-Resolution TerraSAR-X Images

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    Stefan Wiehle

    2015-01-01

    Full Text Available We present an algorithm for automatic detection of the land-water-line from TerraSAR-X images acquired over the Wadden Sea. In this coastal region of the southeastern North Sea, a strip of up to 20 km of seabed falls dry during low tide, revealing mudflats and tidal creeks. The tidal currents transport sediments and can change the coastal shape with erosion rates of several meters per month. This rate can be strongly increased by storm surges which also cause flooding of usually dry areas. Due to the high number of ships traveling through the Wadden Sea to the largest ports of Germany, frequent monitoring of the bathymetry is also an important task for maritime security. For such an extended area and the required short intervals of a few months, only remote sensing methods can perform this task efficiently. Automating the waterline detection in weather-independent radar images provides a fast and reliable way to spot changes in the coastal topography. The presented algorithm first performs smoothing, brightness thresholding, and edge detection. In the second step, edge drawing and flood filling are iteratively performed to determine optimal thresholds for the edge drawing. In the last step, small misdetections are removed.

  3. Genetic analysis of benzothiophene biodesulfurization pathway of Gordonia terrae strain C-6.

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    Wei Wang

    Full Text Available Sulfur can be removed from benzothiophene (BT by some bacteria without breaking carbon-carbon bonds. However, a clear mechanism for BT desulfurization and its genetic components have not been reported in literatures so far. In this study, we used comparative transcriptomics to study differential expression of genes in Gordonia terrae C-6 cultured with BT or sodium sulfate as the sole source of sulfur. We found that 135 genes were up-regulated with BT relative to sodium sulfate as the sole sulfur source. Many of these genes encode flavin-dependent monooxygenases, alkane sulfonate monooxygenases and desulfinase, which perform similar functions to those involved in the 4S pathway of dibenzothiophene (DBT biodesulfurization. Three of the genes were found to be located in the same operon, designated bdsABC. Cell extracts of pET28a-bdsABC transfected E. coli Rosetta (DE3 converted BT to a phenolic compound, identified as o-hydroxystyrene. These results advance our understanding of enzymes involved in the BT biodesulfurization pathway.

  4. Making a Noise – Making a Difference: Techno-Punk and Terra-ism

    Directory of Open Access Journals (Sweden)

    Graham St John

    2010-07-01

    Full Text Available This article charts the convergence of post-punk/post-settler logics in the techno-punk development in Australia. Exploring how punk would become implicated in the cultural politics of a settler society struggling for legitimacy, it maps the ground out of which Labrats sound system (and their hybrid outfit Combat Wombat arose. It provides an entry to punk through an analysis of the concept of hardcore in the context of cultural mobilisations which, following more than two centuries of European colonisation, evince desires to make reparations and forge alliances with indigenous people and landscape. To achieve this, the article traces the contours and investigates the implications of Sydney’s techno-punk emergence (as seen in The Jellyheads, Non Bossy Posse, Vibe Tribe and Ohms not Bombs, tracking the mobile and media savvy exploits of 1990s DIY sound systems and techno terra-ists, aesthetes and activists adopting intimate and tactical media technologies, committing to independent and decentralised EDM creativity, and implicated in a movement for legitimate presence.

  5. Assessment of motion effects on the FPSO (Floating, Production, Storage and Offloading) vessel Terra Nova

    Energy Technology Data Exchange (ETDEWEB)

    Cheung, B.; Hofer, K. [Defence Research and Development Canada, Toronto, ON (Canada); Brooks, C.J. [Survival Systems Group Ltd., Dartmouth, NS (Canada)

    2002-10-01

    A study was conducted to define the incidence and severity of seasickness, motion-induced fatigue and task performance problems encountered on the Floating, Production, Storage, Offshore (FPSO) vessel which Petro-Canada operates in the Grands Banks of Newfoundland at the Terra Nova Field. The FPSO vessel is tethered to the oil well head by flexible couplings and is subjected to severe wave motion at sea. Crew members living and working aboard the FPSO vessel are exposed to more severe weather motion compared to those on fixed installation platforms, particularly during the winter months. The study involved a questionnaire to determine if seasickness is a problem and whether specific ship motions affect sleep, mental and physical performance on the vessel. Ship motion data was obtained through sensors mounted on the bow of the vessel. Respondents revealed that the incidence and severity of motion sickness and sleep disturbance ranged from slight to moderate. The correlation between sleep disturbance and ship motion was high. Problems in task performance ranged from loss of concentration, decision making and memory disorders and task completion problems. The number of safety, health and performance issues increased with bad weather conditions. One of the objectives of this study is to develop recommendations to provide operations guidance to improve comfort and performance on FPSO vessels. 13 tabs., 7 figs.

  6. Geologic map of MTM -15027, -20027, -25027, and -25032 quadrangles, Margaritifer Terra region of Mars

    Science.gov (United States)

    Irwin, Rossman P.; Grant, John A.

    2013-01-01

    Mars Transverse Mercator (MTM) quadrangles −15027, −20027, −25027, and −25032 (lat 12.5°−28° S., long 330°−335° E. and lat 22.5°−28° S., long 324.5°−330° E.) in southwestern Margaritifer Terra include diverse erosional landforms, sedimentary deposits, and tectonic structures that record a long geologic and geomorphic history. The northeastern regional slope of the pre-Noachian crustal dichotomy (as expressed along the Chryse trough) and structures of the informally named Middle Noachian or older Holden and Ladon impact basins dominate the topography of the map area. A series of mesoscale outflow channels, Uzboi, Ladon, and Morava Valles, integrated these formerly enclosed basins by overflow and incision around the Noachian/Hesperian transition, although some flooding may have occurred earlier. The area includes excellent examples of Late Noachian to Hesperian valley networks, dissected crater rims, alluvial fans, deltas, and light-toned layered deposits, particularly in Holden and Eberswalde craters. Structural forms include Tharsis-radial grabens, Hesperian wrinkle ridges, floor-fractured impact craters, and severely disrupted chaotic terrains. These well-preserved landforms and sedimentary deposits represent multiple erosional epochs and discrete flooding events, which provide significant insight into the geomorphic processes and climate change on early Mars.

  7. Assessment of the Short-Term Radiometric Stability between Terra MODIS and Landsat 7 ETM+ Sensors

    Science.gov (United States)

    Choi, Taeyoung; Xiong, Xiaxiong; Chander, G.; Angal, Amit

    2009-01-01

    The Landsat 7 (L7) Enhanced Thematic Mapper (ETM+) sensor was launched on April 15th, 1999 and has been in operation for over nine years. It has six reflective solar spectral bands located in the visible and shortwave infrared part of the electromagnetic spectrum (0.5 - 2.5 micron) at a spatial resolution of 30 m. The on-board calibrators are used to monitor the on-orbit sensor system changes. The ETM+ performs solar calibrations using on-board Full Aperture Solar Calibrator (FASC) and the Partial Aperture Solar Calibrator (PASC). The Internal Calibrator Lamp (IC) lamps, a blackbody and shutter optics constitute the on-orbit calibration mechanism for ETM+. On 31 May 2003, a malfunction of the scan-line corrector (SLC) mirror assembly resulted in the loss of approximately 22% of the normal scene area. The missing data affects most of the image with scan gaps varying in width from one pixel or less near the centre of the image to 14 pixels along the east and west edges of the image, creating a wedge-shaped pattern. However, the SLC failure has no impacts on the radiometric performance of the valid pixels. On December 18, 1999, the Moderate Resolution Imaging Spectroradiometer (MODIS) Proto-Flight Model (PFM) was launched on-board the NASA's EOS Terra spacecraft. Terra MODIS has 36 spectral bands with wavelengths ranging from 0.41 to 14.5 micron and collects data over a wide field of view angle (+/-55 deg) at three nadir spatial resolutions of 250 m, 500 in 1 km for bands 1 to 2, 3 to 7, and 8 to 36, respectively. It has 20 reflective solar bands (RSB) with spectral wavelengths from 0.41 to 2.1 micron. The RSB radiometric calibration is performed by using on-board solar diffuser (SD), solar diffuser stability monitor (SDSM), space-view (SV), and spectro-radiometric calibration assembly (SRCA). Through the SV port, periodic lunar observations are used to track radiometric response changes at different angles of incidence (AOI) of the scan mirror. As a part of the AM

  8. Dynamics of inorganic components in lake waters from Terra Nova Bay, Antarctica.

    Science.gov (United States)

    Conca, E; Malandrino, M; Giacomino, A; Buoso, S; Berto, S; Verplanck, P L; Magi, E; Abollino, O

    2017-09-01

    Water and Suspended Particulate Material (SPM) samples analysed in this work were collected in the austral summer 2011/12 from six shallow Antarctic lakes (Carezza, Edmonson Point 14 and 15a, Gondwana, Inexpressible Island 10b and Tarn Flat 20) of Terra Nova Bay (Northern Victoria Land, Antarctica). The total concentrations of a large suite of inorganic analytes were determined, in order to gain insight into the natural processes regulating species distribution, define natural background values and detect possible present or future local and/or global anthropogenic contamination. Lake water composition was found to be influenced by marine spray, lake geographical position and meltwater input. Seasonal variability was also evaluated for each analyte, and explained considering the natural transport processes involving each species. Multivariate chemometric techniques were used in order to identify groups of samples with similar characteristics and find out similarities and correlations among variables. The variability observed within the water samples is closely connected to the marine aerosol input; hence, it is primarily a consequence of geographical and meteorological factors, such as distance from the ocean and period of year. Higher element concentrations have been found in SPM than in water, suggesting that weathering plays an important role on the chemistry of these lakes or that adsorption processes take place. SPM samples were also examined with a Scanning Electron Microscope (SEM), and many diatoms belonging to different species were detected. No clear evidence of a relevant metal contamination was found in the investigated area. Copyright © 2017 Elsevier Ltd. All rights reserved.

  9. On-Orbit Spatial Characterization of MODIS with ASTER Aboard the Terra Spacecraft

    Science.gov (United States)

    Xie, Yong; Xiong, Xiaoxiong

    2011-01-01

    This letter presents a novel approach for on-orbit characterization of MODerate resolution Imaging Spectroradiometer (MODIS) band-to-band registration (BBR) using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) aboard the Terra spacecraft. The spatial resolution of ASTER spectral bands is much higher than that of MODIS, making it feasible to characterize MODIS on-orbit BBR using their simultaneous observations. The ground target selected for on-orbit MODIS BBR characterization in this letter is a water body, which is a uniform scene with high signal contrast relative to its neighbor areas. A key step of this approach is to accurately localize the measurements of each MODIS band in an ASTER measurement plane coordinate (AMPC). The ASTER measurements are first interpolated and aggregated to simulate the measurements of each MODIS band. The best measurement match between ASTER and each MODIS band is obtained when the measurement difference reaches its weighted minimum. The position of each MODIS band in the AMPC is then used to calculate the BBR. The results are compared with those derived from MODIS onboard Spectro-Radiometric Calibration Assembly. They are in good agreement, generally less than 0.1 MODIS pixel. This approach is useful for other sensors without onboard spatial characterization capability. Index Terms Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), band-to-band registration (BBR), MODerate resolution Imaging Spectroradiometer (MODIS), spatial characterization.

  10. Economia política da disputa por terras em Minas Gerais

    Directory of Open Access Journals (Sweden)

    Ari Francisco de Araujo Junior

    2008-09-01

    Full Text Available O artigo estuda os determinantes da probabilidade de ocorrência de conflitos de terra, ocupações e assentamentos nos municípios mineiros. Os resultados apontam para a importância de fatores econômicos e políticos. Aparentemente, militantes pró-reforma agrária se adequam ao ciclo político, causando menos conflito em municípios governados por aliados. Por sua vez, a pobreza e o elevado crescimento arrefecem o ímpeto desses militantes.The article analyzes the determinants of the probability of dispute over land (conflicts, occupations and settlement projects in the Brazilian state of Minas Gerais. Through the use of a logit model, we found that the main influences are political and economical ones. Apparently, the behavior of the agrarian reform's supporters follows the political incentive, with fewer occurrences of conflicts in towns governed by political allies. By other hand, the economical determinants - degree of poverty and the economic growth - have negative impacts on it.

  11. Assessment of volatile organic compounds from banana Terra subjected to different alcoholic fermentation processes

    Directory of Open Access Journals (Sweden)

    Michely CAPOBIANGO

    2016-01-01

    Full Text Available Abstract Banana characteristics could provide yeast growth and support the action of yeast to produce beverages. The effects of enzymatic treatment, centrifugation, commercial yeast and two selected strains of Saccharomyces cerevisiae were investigated using the fermented banana Terra. Volatile organic compounds (VOCs were determined by solid phase microextraction using gas chromatography mass spectrometry. The results showed that the condition employing enzymatic treatment, centrifugation and wet commercial yeast provided maximum ethanol yield (86% and effiency (98%. Twenty-two compounds of distinct chemical classes were analysed including alcohols, esters, acids and aldehydes. The concentrations of the VOCs differed depending on the fermentation condition and were more influenced by using different yeasts. The limits of detection and quantification ranged from 0.056 to 2.694 mg L–1 and 0.057 to 2.904 mg L–1 respectively. Among the most prevalent VOCs the higher alcohols ranged from 353 to 1017 mg per 100 mL of anhydrous alcohol. The fermented banana studied showed a composition similar to other fermented fruit pulps.

  12. Mycobacterium icosiumassiliensis sp. nov., a New Member in the Mycobacterium terrae Complex Isolated from Surface Water in Algeria.

    Science.gov (United States)

    Djouadi, Lydia N; Levasseur, Anthony; Khalil, Jacques Bou; Blanc-Taileur, Caroline; Asmar, Shady; Ghiloubi, Wassila; Natèche, Farida; Drancourt, Michel

    2016-08-01

    An acid-fast, rapidly growing, rod-shaped microorganism designated 8WA6 was isolated from a lake in Algiers, Algeria. The lake water was characterized by a temperature of 18 °C, a pH of 7.82, a copper concentration of 8.6 µg/L, and a cadmium concentration of 0.6 µg/L. First-line molecular identification confirmed the 8WA6 isolate to be a member of the Mycobacterium terrae complex, sharing 99.4 % 16S rRNA gene sequence similarity with M. arupense AR-30097, 98.2 % partial hsp65 gene sequence similarity with M. terrae 28K766, and 97.1 % partial rpoB gene sequence similarity with Mycobacterium sp. FI-05396. Its 4.89-Mb genome exhibits a 66.8 GC % and an average nucleotide identity of 64.5 % with M. tuberculosis, 70.5 % with M. arupense, and 75 % with M. asiaticum. In the M. terrae complex, Mycobacterium 8WA6 was unique in exhibiting growth at 42 °C, negative reaction for nitrate reduction, urease activity and Tween 80 hydrolysis, and a positive reaction for α-glucosidase and β-glucosidase. Its protein profile determined by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry revealed a unique spectrum similar to M. arupense and M. terrae, exhibiting eleven specific peaks at 3787.791, 4578.019, 6349.630, 6855.638, 7202.310, 8149.608, 8775.257, 10,224.588, 10,484.116, 12,226.379, and 12,636.871 m/z. Minimal inhibitory concentrations (MIC) for antibiotics, determined by microdilution, indicated a broad spectrum resistance, except for rifabutin (MIC, 0.5 g/L) and cefoxitin (MIC, 16 g/L). We concluded that the 8WA6 isolate is a representative isolate of a previously undescribed species in the M. terrae complex, which was named M. icosiumassiliensis sp. nov. with strain 8WA6 (Collection de Souches de l'Unité des Rickettsies, CSUR P1561, Deutsche Sammlung von Mikroorganismen und Zellkulturen, DSM 100711) as the type strain.

  13. Cardiomiopatia de Takotsubo: uma causa rara de choque cardiogênico simulando infarto agudo do miocárdio Takotsubo cardiomiopathy: a rare cause of cardiogenic shock simulating acute myocardial infarction

    Directory of Open Access Journals (Sweden)

    Jayro Thadeu Paiva de Vasconcelos

    2005-08-01

    Full Text Available Cardiomiopatia de Takotsubo é uma causa rara de aneurisma ventricular esquerdo agudo, na ausência de coronariopatia, só recentemente descrita na literatura mundial. Os sintomas podem assemelhar-se aos do infarto agudo do miocárdio com dor torácica típica. A imagem do balonamento ventricular sugestivo de haltere ou "Takotsubo" (dispositivo utilizado no Japão para prender Octopus é característico desta nova síndrome e usualmente há desaparecimento do movimento discinético até o 18º dia do início dos sintomas, em média.Takotsubo Cardiomiopathy is a rare cause of acute left ventricular aneurysm, in the absence of coronariopathy, only recently described in world literature. Symptoms may be similar to those from acute myocardial infarction with typical thoracic pain. The image of dumbbell or Takotsubo (a device used in Japan to capture octopus suggestive ventricular ballooning is characteristic of that new syndrome and there is usually the disappearing of dyskinetic movement up to the 18th day from the beginning of the symptoms, in average.

  14. Identificação e caracterização de variantes novas e raras da hemoglobina humana Identification of characterization of novel and rare variants of human hemoglobin

    Directory of Open Access Journals (Sweden)

    Elza M. Kimura

    2008-08-01

    Full Text Available As anormalidades estruturais da hemoglobina estão entre as doenças genéticas mais comumente encontradas nas populações humanas. O Laboratório de Hemoglobinopatias do Departamento de Patologia Clínica da Faculdade de Ciências Médicas da Universidade Estadual de Campinas - Unicamp, localizado em Campinas, no estado de São Paulo, região Sudeste do Brasil, realizou, em seus 27 anos de existência, cerca de 130.000 diagnósticos. Entre as variantes estruturais detectadas, as hemoglobinas S, C e D-Punjab foram, como esperado, as mais freqüentes, porém um número expressivo de outras hemoglobinas anômalas, novas e raras, também foi encontrado. Esses achados estão sumarizados no presente artigo.Hemoglobin structural abnormalities are among the most commonly found human genetic diseases. The Laboratory of Hemoglobinopathies in the Clinical Pathology Department of the Medical Sciences School of the State University in Campinas - Unicamp, São Paulo, Southeastern Brazil, carried out, in its 27 years of activity, about 130,000 diagnoses. As expected, hemoglobins S, C and D were the most frequently observed variants, but an expressive number of other abnormal, novel and rare hemoglobins, was also detected. These findings are summarized in the present article.

  15. A rare but successful reproductive tactic in a social wasp (Hymenoptera:Vespidae: Use of heterospecific nests Una táctica reproductiva rara pero exitosa en una avispa social (Hymenoptera: Vespidae: Uso de nidos de otras especies

    Directory of Open Access Journals (Sweden)

    ANDRÉ R. DE SOUZA

    2012-09-01

    Full Text Available Successful heterospecific use of abandoned nests has been reported in birds. Although the same behavior has been observed in wasps, the success of such tactic has not been demonstrated. We described two cases in which the social wasp Polistes versicolor successfully reared its brood in empty nests of the social wasps Mischocyttarus drewseni and Mischocyttarus cassununga (Hymenoptera: Vespidae. We showed that this is a rare but a viable reproductive tactic for both solitary and associative foundress. Unlike birds, which use heterspecific nests very similar to their own, wasps are able to use heterspecific nests that do differ from their own.El uso adecuado de los nidos abandonados ha sido reportado en aves. Aunque el mismo comportamiento se ha observado en avispas, pero el éxito de tal táctica no ha sido demostrada. Se describen dos casos en los que la avispa social Polistes versicolor utiliza con éxito los nidos vacíos de la avispa social Mischocyttarus drewseni y Mischocyttarus cassununga (Hymenoptera: Vespidae. Hemos demostrado que esta es una rara, pero una viable táctica reproductiva. A diferencia de las aves, que utilizan nidos muy similares a las suyas, las avispas son capaces de utilizar los nidos que difieran de los suyos.

  16. Mycobacterium arupense, Mycobacterium heraklionense, and a Newly Proposed Species, "Mycobacterium virginiense" sp. nov., but Not Mycobacterium nonchromogenicum, as Species of the Mycobacterium terrae Complex Causing Tenosynovitis and Osteomyelitis.

    Science.gov (United States)

    Vasireddy, Ravikiran; Vasireddy, Sruthi; Brown-Elliott, Barbara A; Wengenack, Nancy L; Eke, Uzoamaka A; Benwill, Jeana L; Turenne, Christine; Wallace, Richard J

    2016-05-01

    Mycobacterium terrae complex has been recognized as a cause of tenosynovitis, with M. terrae and Mycobacterium nonchromogenicum reported as the primary etiologic pathogens. The molecular taxonomy of the M. terrae complex causing tenosynovitis has not been established despite approximately 50 previously reported cases. We evaluated 26 isolates of the M. terrae complex associated with tenosynovitis or osteomyelitis recovered between 1984 and 2014 from 13 states, including 5 isolates reported in 1991 as M. nonchromogenicum by nonmolecular methods. The isolates belonged to three validated species, one new proposed species, and two novel related strains. The majority of isolates (20/26, or 77%) belonged to two recently described species: Mycobacterium arupense (10 isolates, or 38%) and Mycobacterium heraklionense (10 isolates, or 38%). Three isolates (12%) had 100% sequence identity to each other by 16S rRNA and 99.3 to 100% identity by rpoB gene region V sequencing and represent a previously undescribed species within the M. terrae complex. There were no isolates of M. terrae or M. nonchromogenicum, including among the five isolates reported in 1991. The 26 isolates were susceptible to clarithromycin (100%), rifabutin (100%), ethambutol (92%), and sulfamethoxazole or trimethoprim-sulfamethoxazole (70%). The current study suggests that M. arupense, M. heraklionense, and a newly proposed species ("M. virginiense" sp. nov.; proposed type strain MO-233 [DSM 100883, CIP 110918]) within the M. terrae complex are the major causes of tenosynovitis and osteomyelitis in the United States, with little change over 20 years. Species identification within this complex requires sequencing methods. Copyright © 2016, American Society for Microbiology. All Rights Reserved.

  17. MATER - Pianeta Terra-Mare: an interactive and multidisciplinary approach to Geosphere sciences

    Science.gov (United States)

    Piangiamore, Giovanna Lucia; Fanelli, Emanuela; Furia, Stefania; Garau, Daniela; Merlino, Silvia; Musacchio, Gemma; Carla Centineo, Maria

    2016-04-01

    Recent studies demonstrate that Earth and Marine Sciences are not properly treated in scholastic programs and in textbooks are included in a superficial way. These topics are interdisciplinary and experimental (biology, ecology, oceanography and geology) and the recent advance in these fields is strictly linked to technologic improvement. School cannot keep up with the huge advances of knowledge experimented in the last 20 years, also for the lack of didactic laboratories sufficiently updated to support experimental activities. In this context, in 2014-15 three Italian Research Institutes (INGV, ISMAR-CNR and ENEA-CRAM) have decided to support the Unified School District "ISA 10"of Lerici (Liguria, Italy) - comprehensive of kindergartner, primary and middle schools - to develop the project MATER - Pianeta Terra-Mare (Planet Earth and Sea). The acronym MATER (MARe and TERra) has also a gender value, as people involved in the projects were women, mostly researchers and teachers, which have worked side by side with other women belonging to environmental and cultural associations of the territory. This heterogeneous group has a common objective: to promote the diffusion of a scientific culture and to sensitize students from 3 to 14 years towards problems occurring in marine and terrestrial environments, fostering the settlement of a sustainable attitude to the exploitation of natural resources and consciousness to natural hazards, such as earthquakes and floods, quite common in the Ligurian region. MATER has been considered as one of the best projects funded by MIUR (Italian Ministry of Education, University and Research) inside the Dissemination of Scientific and Technological Culture call for the year 2014. Natural hazards (Planet Earth) and the chemical-physical aspects and resources of the marine environment (Planet Sea) were the two modules of the project. Planet Earth developed through Piovono Idee! (Cloudy with a chance of Ideas!), an interactive exhibition on

  18. Gli effetti della subgravità e i metodi per riprodurla a terra e in volo

    Directory of Open Access Journals (Sweden)

    G. MEINERI

    1963-06-01

    Full Text Available L'A. enuncia brevemente il problema della subgravità
    descrivendo le principali soluzioni sperimentali escogitate nel corso dell'ultimo
    decennio per rispondere ai vari interrogativi cbe tale particolare caratteristica
    del volo spaziale, clie non trova riscontro in alcuna altra condizione nota
    all'uomo, pone agli studiosi, biologi e tecnici.
    L'A. passa quindi a descrivere i principali metodi e dispositivi per
    riprodurre lo stato di subgravità, distinguendo i sistemi « a terra », auspicabili
    per la loro agevolezza, sicurezza, ma cbe in genere non riproducono che
    taluni aspetti fisiopsicologici dello stato subgravitazionale, dai sistemi, ben
    più indaginosi, che consentono di realizzare stati di subgravità reali e completi
    (voli parabolici, lanci suborbitali e orbitali di missili. Passa infine a
    esporre quanto è stato fatto in questo campo presso il Centro di Studi e
    Ricerche di Medicina Aeronautica e Spaziale di Roma, impiegando la « Torre
    di Subgravità », ideata e costruita presso detto Centro, la quale consente
    di realizzare veri stati di subgravità, sia pure di breve durata, preceduti e
    seguiti da accelerazioni. La « Torre di Subgravità » ha permesso di affrontare
    alcuni problemi inerenti al volo spaziale, soprattutto quelli jtosti dagli stati
    di transizione tra le fasi attive e quella passiva del volo, proponendo soluzioni
    di non trascurabile interesse pratico (comportamento psicomotorio dei
    soggetti, ruolo del labirinto in toto e delle sue singole componenti, ecc..
    L'A. conclude quindi facendo rilevare l'interesse di questa metodica,
    suscettibile di sviluppi anche più ampi, che può ben allinearsi nel campo
    mondiale alle ricerche inerenti al volo spaziale.

  19. Summer snowmelt patterns in the South Shetlands using TerraSAR-X imagery

    Science.gov (United States)

    Mora, C.; Jimenez, J. J.; Catalao Fernades, J.; Ferreira, A.; David, A.; Ramos, M.; Vieira, G.

    2014-12-01

    Snow plays an important role in controlling ground thermal regime and thus influencing permafrost distribution in the lower areas of the South Shetlands archipelago, where late lying snowpatches protect the soil from summer warming. However, summer snow distribution is complex in the mountainous environments of the Maritime Antarctica and it is very difficult to obtain accurate mapping products of snow cover extent and also to monitor snowmelt. Field observations of snow cover in the region are currently based on: i) thickness data from a very scarce network of meteorological stations, ii) temperature poles allowing to estimate snow thickness, iii) and time-lapse cameras allowing for assessing snow distribution over relatively small areas. The high cloudiness of the Maritime Antarctic environment limits good mapping results from the analysis of optical remote sensing imagery such as Landsat, QuickBird or GeoEye. Therefore, microwave sensors provide the best imagery, since they are not influenced by cloudiness and are sensitive to wet-snow, typical of the melting season. We have acquired TerraSAR-X scenes for Deception and Livingston Islands for January-March 2014 in spotlight (HH, VV and HH/VV) and stripmap modes (HH) and analyse the radar backscattering for determining the differences between wet-snow, dry-snow and bare soil aiming at developing snow melt pattern maps. For ground truthing, snowpits were dug in order to characterize snow stratigraphy, grain size, grain type and snow density and to evaluate its effects on radar backscattering. Time-lapse cameras allow to identify snow patch boundaries in the field and ground surface temperatures obtained with minloggers, together with air temperatures, allow to identify the presence of snow cover in the ground. The current research is conducted in the framework of the project PERMANTAR-3 (Permafrost monitoring and modelling in Antarctic Peninsula - PTDC/AAG-GLO/3908/2012 of the FCT and PROPOLAR).

  20. Investigation and Mitigation of the Crosstalk Effect in Terra MODIS Band 30

    Directory of Open Access Journals (Sweden)

    Junqiang Sun

    2016-03-01

    Full Text Available It has been previously reported that thermal emissive bands (TEB 27–29 in the Terra (T- MODerate resolution Imaging Spectroradiometer (MODIS have been significantly affected by electronic crosstalk. Successful linear theory of the electronic crosstalk effect was formulated, and it successfully characterized the effect via the use of lunar observations as viable inputs. In this paper, we report the successful characterization and mitigation of the electronic crosstalk for T-MODIS band 30 using the same characterization methodology. Though the phenomena of the electronic crosstalk have been well documented in previous works, the novel for band 30 is the need to also apply electronic crosstalk correction to the non-linear term in the calibration coefficient. The lack of this necessity in early works thus demonstrates the distinct difference of band 30, and, yet, in the same instances, the overall correctness of the characterization formulation. For proper result, the crosstalk correction is applied to the band 30 calibration coefficients including the non-linear term, and also to the earth view radiance. We demonstrate that the crosstalk correction achieves a long-term radiometric correction of approximately 1.5 K for desert targets and 1.0 K for ocean scenes. Significant striping removal in the Baja Peninsula earth view imagery is also demonstrated due to the successful amelioration of detector differences caused by the crosstalk effect. Similarly significant improvement in detector difference is shown for the selected ocean and desert targets over the entire mission history. In particular, band 30 detector 8, which has been flagged as “out of family” is restored by the removal of the crosstalk contamination. With the correction achieved, the science applications based on band 30 can be significantly improved. The linear formulation, the characterization methodology, and the crosstalk effect correction coefficients derived using lunar