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Sample records for azoto mineral durante

  1. Produção de azoto mineral durante a compostagem de fracção sólida de chorume da pecuária leiteira intensiva Production of mineral nitrogen during composting of dairy cattle slurry solid fraction

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    L. M. Brito

    2009-01-01

    Full Text Available A fracção sólida do chorume (FSC de duas explorações de pecuária leiteira intensiva foi compostada: (i em 2004, sobre o solo, incluindo, ou não, palha, e com diferentes níveis de revolvimento; e (ii em 2005, sobre uma tela de cobertura do solo, com e sem revolvimento, com diferentes coberturas e diferentes volumes. O teor de matéria seca (MS da FSC da primeira exploração (30% apresentou um valor superior, embora o rendimento da máquina separadora da FSC tenha sido inferior (1 m³ hora-1 relativamente ao observado na segunda exploração (4 e 3 m³ hora-1 correspondendo a 22% e 24% de MS, respectivamente, em 2004 e 2005. A FSC1 com 30% de MS atingiu elevadas temperaturas logo após a sua separação mas o mesmo não aconteceu com a FSC2 com menor teor de MS, particularmente quando foi compostada sem palha. O pH da FSC variou entre 8 e 9 durante a compostagem e a razão C/N foi semelhante entre tratamentos para o mesmo período de compostagem. O teor de N-NH4+ foi muito elevado durante a fase termófila da compostagem, após a qual diminuiu, acentuadamente, enquanto que o teor de N-NO3-foi mínimo naquela fase e aumentou após três meses de compostagem. O maior teor de MS inicial da FSC1 em comparação com a FSC2 e a mistura com palha associaram-se a concentrações mais baixas de azoto amoniacal (NNH4+. Considerando estas observações e, ainda, que as elevadas temperaturas durante a compostagem e o pH alcalino da FSC potenciam, eventualmente, a volatilização de amoníaco, a redução deste tipo de perdas de N poderá ser conseguida: (i diminuindo o rendimento da máquina separadora da FSC; (ii misturando a FSC com um material com elevada razão C/N; e (iii diminuindo o número de revolvimentos.Screw pressed dairy cattle slurry solid fraction (CSSF was collected during 2004 and 2005 from two dairy farms with 30% and 22% -24% dry matter (DM content and the effects of covered either with black polyethylene or with polypropylene

  2. Mineralização de azoto de diferentes resíduos orgânicos em incubação laboratorial de longa duração Nitrogen mineralization from different organic residues in long-term laboratory incubation

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    J.P. Carneiro

    2007-07-01

    Full Text Available O objectivo do presente trabalho foi determinar, em condições laboratoriais e através de um ensaio de incubação de longa duração (443 dias, a mineralização do N orgânico resultante da incorporação de lamas de depuração, compostado de resíduos sólidos urbanos (RSU, chorume de bovinos e lamas celulósicas, num Solo Litólico de granito. À excepção das lamas celulósicas (80 kg N ha-1, os resíduos orgânicos foram incorporados em duas doses (80 e 160 kg N ha-1. A avaliação da mineralização do N orgânico dos resíduos foi efectuada através da medição do teor de N mineral acumulado ( N-NH4+ e N-NO3 no solo com resíduo, tendo as amostragens sido efectuadas aos 1, 2, 3, 4, 8, 11, 15, 22, 29, 36, 46, 59, 74, 88, 120, 144, 186, 249, 338 e 443 dias após o início da incubação. O chorume e as lamas de depuração foram os correctivos orgânicos que promoveram teores iniciais de N mineral no solo mais elevados, tendo o chorume disponibilizado no final do ensaio, na média das duas doses, 50% do N total incorporado, e as lamas 76%. As lamas celulósicas e o compostado de RSU originaram imobilização de azoto, tendo-se observado esse efeito durante todo o ensaio e por um período de 4-5 meses, respectivamente. Em relação ao N total aplicado, e após 443 di-as de incubação, o tratamento com lamas apresentou uma imobilização de 43%, enquanto que no tratamento com compostado de RSU a mineralização foi de 26%. Os resíduos orgânicos utilizados apresentaram um comportamento muito distinto no que respeita à disponibilização de azoto após a sua incorporação ao solo. Face a essa diferença, a aplicação de chorume e das lamas de depuração deverá ser acompanhada na prática pela redução das adubações azotadas imediatas, enquanto que na utilização de compostado de RSU e, sobretudo de lamas celulósicas, poderse-á impor um reforço da adubação azotada de fundo e de cobertura.The aim of this study was to

  3. Efeito de fertilizantes minerais e orgânicos na produção de Azevém (Lolium multiflorum L.: produção de matéria seca e azoto aparentemente recuperado Effect of mineral and organic fertilizers in the ryegrass yield (Lolium multiflorum L.: Dry matter yield and apparent N recovery

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    M. Arrobas

    2009-01-01

    Full Text Available Para avaliar o azoto disponibilizado para as plantas a partir de fertilizantes minerais e orgânicos, foi instalado um ensaio em vasos com azevém anual. Os fertilizantes utilizados foram: Casca de Castanha (CC com 0,6% de azoto (N; Estrume de Bovino (EB, com 2,3% de N; Beira Adubo (BA, um guano comercial com 3,0% de N; Nitrato de Amónio (NA, com 20,5% de N, Entec (En, adubo com um inibidor da nitrificação, com 26% de N; e Fertigafsa (Fg, adubo composto ternário 4-16-12. Estabeleceu-se também uma modalidade Testemunha (T sem N. Todos os fertilizantes foram aplicados em dose equivalente a 200 mg de N por kg da fracção terra fina de um solo com textura franco-limosa, com pH (H2O 5,2 e 27 g kg-1 de matéria orgânica. Em todos os vasos foi aplicada uma solução nutritiva sem N. A sementeira foi efectuada a 1 de Outubro de 2004. Após germinação, foram mantidas 50 plantas por vaso. A produção de biomassa foi avaliada em 6 cortes, entre 9 de Novembro de 2004 e 4 de Agosto de 2005. Foi avaliada a produção de biomassa, o N exportado e o N aparentemente recuperado (NAR. A produção média acumulada de matéria seca variou significativamente entre 1,7 e 4,1 g/vaso em T e NA, respectivamente. A modalidade NA registou a exportação mais elevada (167 mg N/vaso e o maior valor de NAR (64%. Entre os fertilizantes minerais destacou-se o menor valor de NAR associado a En (45%, enquanto que os materiais orgânicos BA e EB tiveram comportamento semelhante entre si (24 e 22%, respectivamente. Nestas condições, os fertilizantes orgânicos (BA e EB e En foram pouco efectivos na libertação de N para a cultura. Os resultados fazem antever dificuldades na gestão destes fertilizantes em culturas anuais de ciclo curto, uma vez que estas podem ficar privadas de N durante fases importantes do seu desenvolvimento.A pot experiment with italian ryegrass was carried out to evaluate the N release from several fertilisers and organic amendments. The

  4. Determinazione dell'azoto ammoniacale: metodo spettrofotometrico in assorbimento molecolare

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    Tartari, Gabriele A.

    2012-01-01

    Metodo analitico interno al laboratorio di idrochimica del CNR-ISE di Verbania per la determinazione dell'azoto ammoniacale. In presenza del catalizzatore sodio nitroprussiato lo ione ammonio reagisce con il gruppo fenolico del sodio salicilato; l'azione ossidante del sodio dicloro isocianurato porta alla formazione del composto blu indofenolo il cui spettro presenta un massimo di assorbanza alla lunghezza d'onda di 695 nm.

  5. Azoto normų įtaka pirmamečių pipirmėčių (Mentha piperita L.) derliui ir kokybei

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    Dambrauskienė, Edita; Bundinienė, Ona; Viškelis, Pranas; Zalatorius, Vytautas

    2007-01-01

    2006 metais Lietuvos sodininkystės ir daržininkystės instituto bandymų laukuose tirta azoto normų įtaka pipirmėčių (Mentha piperita L.) žalios masės derliui ir kokybei. Visos tyrimams naudotos pipirmėtės: varietetas iš Lietuvos, varietetas iš Lenkijos ir ‘Krasnodarskaja’ veislė, papildomai patręštos azoto trąšomis, derėjo gausiau. Tyrimais nustatyta, kad didžiausias žalios masės derliaus priedas gautas, tręšiant pipirmėtes didžiausia azoto norma N120 per 3 kartus (N60+30+30). Pipirmėčių žalio...

  6. O comportamento de pés-mãe de Eucalyptus globulus Labill. sujeitos a diferentes níveis de azoto e potássio Influence of nitrogen and potassium on Eucalyptus globulus Labill. mother plants

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    H. M. Ribeiro

    2007-07-01

    Full Text Available Nos sistemas de propagação vegetativa de plantas o estado nutricional dos pés-mãe é determinante para o sucesso do enraizamento das estacas que estes originam. Como tal, a recente implementação, em Portugal, da técnica de propagação vegetativa de Eucalyptus globulus Labill. ssp. globulus por enraizamento de estacas caulinares, justifica plenamente o estudo da fertilização de pés-mãe desta espécie e o seu efeito no enraizamento das estacas. Assim, e com o objectivo de avaliar o efeito do azoto e do potássio no crescimento de pés-mãe de E. globulus e no enraizamento das estacas obtidas, foi instalado um ensaio de fertilização que decorreu durante um período de 2 anos. No ensaio utilizaram-se 2 clones desta espécie (HD161 e CN5 e testaram-se 6 modalidades de fertilização, correspondentes à combinação de 3 níveis de azoto (50, 100, 200 mg N L-1 e 2 de potássio (50 e 100 mg K L-1 na solução nutritiva utilizada. No primeiro ano de crescimento (1998 os pés-mãe foram sujeitos a uma poda de formação, tendo-se avaliado a biomassa recolhida. No segundo ano (1999, para além da biomassa recolhida, determinou-se também o número de estacas produzidas por pé-mãe e a capacidade de enraizamento dessas estacas. Com o delineamento experimental utilizado não se observaram, em todos os parâmetros avaliados, diferenças significativas entre os dois níveis de potássio, nem interacções significativas entre o potássio e os restantes factores em estudo. Relativamente ao azoto, a análise dos dados obtidos permitiu concluir que o aumento da concentração de azoto na solução nutritiva, de 50 para 200 mg L-1, originou aumentos significativos da biomassa recolhida nas podas, da produção de estacas e da percentagem de enraizamento das estacas, contrariando a ideia que o aumento da disponibilidade de azoto pode conduzir uma redução do enraizamento. Os resultados permitem assim concluir que o azoto é determinante para o

  7. Comportamiento del arrastre de partículas en los gases durante el secado del mineral laterítico en tambores cilíndricos rotatorios

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    Alexis García-Pérez

    2000-03-01

    Full Text Available Se utiliza un método estadístico-matemático de planificación de experimentos para la investigación del comportamiento del arrastre de partículas finas en los gases durante el secado del mineral laterítico en uno de los secadores en condiciones normales de operación. En un segundo se eliminaron los levantadores sectoriales en el último tercio del equipo, y se analizó en ambos la influencia de los gases residuales provenientes de la planta de hornos de reducción. Se obtiene la correlación y regresión entre las variables de entrada más importantes que intervienen en el proceso: velocidad de los gases en el interior del cilindro (V, contenido de humedad de los gases (W, y el arrastre de partículas (A como variable de salida. Los resultados obtenidos ofrecen alentadoras perspectivas sobre la generalización industrial de la propuesta.

  8. Uso de suplementación mineral con monensina sódica en corderas Pelibuey durante el crecimiento postdestete Use of mineral supplementation with monensin sodium in Pelibuey female lambs during the postweaning growth

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    AT Piñeiro-Vázquez

    2009-01-01

    Full Text Available Las corderas Pelibuey tienen una ganancia de peso menor a 80 g/día cuando son alimentadas en base a pastoreo. Tomando esto en consideración, resulta importante estudiar diversos aditivos que muestren posibilidades de optimizar el crecimiento de los corderos. El objetivo de este estudio consistió en evaluar la influencia de la monensina sódica sobre el crecimiento postdestete de las corderas Pelibuey. Doce corderas Pelibuey (76 días de edad y 11,7 kg de peso corporal fueron asignadas a 1 de 2 tratamientos (seis corderas por tratamiento. Los tratamientos consistieron de sales minerales con o sin monensina sódica, ofrecidas a libertad durante 66 días (10 días para adaptación al estudio de crecimiento y 56 días para el estudio de crecimiento. Cada cordera fue asignada a un corral individual; la unidad experimental fue la cordera. El promedio en el consumo diario de sales minerales fue de 12,2 ± 0,9 g/cordera en el tratamiento sin monensina y 2,3 ± 0,6 g/cordera en el tratamiento con monensina. La suplementación mineral con monensina sódica no afectó (P > 0,05 el peso corporal, ganancia de peso total, promedio de ganancia de peso diaria y el crecimiento de las corderas establecido en 15 medidas corporales. Durante los 56 días del estudio, las corderas ganaron peso, 1,5 ± 0,3 kg/cordera y 27 ± 5 g/cordera/día. El tratamiento con monensina no influyó (P > 0,05 en el consumo promedio de materia seca y proteína cruda. En corderas Pelibuey alimentadas con heno de Estrella de áfrica la suplementación mineral con monensina sódica no afectó el promedio en la ganancia de peso diario, ni el consumo diario de materia seca y proteína cruda con respecto a la suplementación mineral sin monensina sódica.Pelibuey lambs have a postweaning weight gain of less than 80 g/d when they are feeding on grazing pastures. Taking this into consideration, it is important to study several additives that could optimize the lambs’ growth. The aim of

  9. Avaliação do metabolismo do monóxido de azoto eritrocitário

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    Duro, Nuno Miguel Henriques, 1989-

    2012-01-01

    O monóxido de azoto (NO) é formado nas células endoteliais vasculares, difundindo-se para os eritrócitos, onde regula a deformabilidade e agregação eritrocitárias, e para a parede vascular onde promove o relaxamento do músculo liso e, por conseguinte, o aumento do diâmetro dos vasos sanguíneos levando ao aumento do fluxo sanguíneo e à redução da pressão arterial. A redução da biodisponibilidade de NO e a consequente disfunção endotelial desencadeiam eventos precursores da formação da placa at...

  10. Complexos de hidrogénio com oxigénio (ou azoto) em metais, estudados por correlações angulares perturbadas

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    Mendes, Paulo Jorge Baeta

    1987-01-01

    Utilizando o método das correlações angulares perturbadas usando como sonda radioactiva o 181 Hf, realizaram-se estudos da interação de hidrogénio e deutério como as impurezas intersticiais oxigénio e azoto nos metais tântalo e nióbio. Foram identificadas as interacções devidas ao oxigénio e azoto nestes metais a caracterizada a sua evolução com a temperatura. Para as baixas concentrações estudadas não se observou a formação de complexos de mais do que um atómo de oxigénio quer no ...

  11. Efeito do tipo de solo na imobilização do azoto por palha em decomposição no Sul de Portugal Effect of soil type on the N immobilization by decomposing straw at the South of Portugal

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    P. Alpendre

    2007-01-01

    Full Text Available É frequente em muitos sistemas agrícolas do Sul de Portugal deixarem-se os resíduos das culturas sobre o solo após a colheita, sendo posteriormente queimados ou incorporados no solo durante o Outono. Não sendo correcta a queima destes resíduos ricos em C, é preferível incorporá-los no solo, promovendo-se a imobilização do azoto (N mineral, derivado da mineralização da Matéria Orgânica do Solo (MOS e dos resíduos. Reduz-se deste modo a elevada perda potencial de nitrato (NO3- por lixiviação, devido aos elevados montantes de precipitação que podem ocorrer no período de Outono/Inverno do clima do Sul de Portugal. É necessário encontrarem-se meios para diminuir a perda de N por lixiviação, nos diferentes sistemas agrícolas e identificar as medidas correctas para reter o N durante mais tempo no sistema solo-planta. Uma das possibilidades é sincronizar, a mineralização do N dos resíduos, com o respectivo consumo pelas plantas, ou através da imobilização do N pelos microorganismos nos resíduos ricos em C. O objectivo deste trabalho foi estudar o efeito de dois solos contrastantes na sua fertilidade, na imobilização e posterior remineralização do N, respectivamente num solo franco-arenoso (Pmg de Évora e num argiloso (Bvc de Beja. Incubou-se palha de trigo dentro de sacos de rede de nylon, com períodos de 1, 4, 8 e 12 meses de amostragem. O ensaio consistiu em três tratamentos: sem N, com adição de 15NH4NO3 e adição de NH4(15NO3. Determinou-se a concentração total em N e em C na palha e nos solos e mediu-se a abundância em 15N. Comparou-se a proporção remanescente do montante inicial de palha incubada, a concentração em N-total nos resíduos e a imobilização em 15N no resíduo da palha. Durante o primeiro mês o 15N foi sendo incorporado à medida que a massa do resíduo e o teor de N-total decresceram. Subsequentemente ocorreu imobilização líquida e o teor de N-total aumentou, apesar de com taxas

  12. Minerals

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    Vaquero, M. P.

    1998-08-01

    Full Text Available The possible changes in the mineral composition of food during frying could be the consequence of losses by leaching, or changes in concentrations caused by exchanges between the food and culinary fat of other compounds. The net result depends on the type of food, the frying fat used and the frying process. Moreover, the modifications that frying produces in other nutrients could indirectly affect the availability of dietary minerals. The most outstanding ones are those that can take place in the fat or in the protein. With respect to the interactions between frying oils and minerals, we have recent knowledge concerning the effects of consuming vegetable oils used in repeated fryings of potatoes without turnover, on the nutritive utilization of dietary minerals. The experiments have been carried out in pregnant and growing rats, which consumed diets containing, as a sole source of fat, the testing frying oils or unused oils. It seems that the consumption of various frying oils, with a polar compound content lower or close to the maximum limit of 25% accepted for human consumption, does not alter the absorption and metabolism of calcium, phosphorous, iron or copper. Magnesium absorption from diets containing frying oils tends to increase but the urinary excretion of this element increases, resulting imperceptible the variations in the magnesium balance. The urinary excretion of Zn also increased although its balance remained unchanged. Different studies referring to the effects of consuming fried fatty fish on mineral bioavailability will also be presented. On one hand, frying can cause structural changes in fish protein, which are associated with an increase in iron absorption and a decrease in body zinc retention. The nutritive utilization of other elements such as magnesium, calcium and copper seems to be unaffected. On the other hand; it has been described that an excess of fish fatty acids in the diet produces iron depletion, but when fatty

  13. Exigências de minerais para cabras durante a gestação: Na, K, Mg, S, Fe e Zn Minerals requirements of goats during the pregnancy: Na, K, Mg, S, F and Zn

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    Roberto Germano Costa

    2003-04-01

    Full Text Available O trabalho foi realizado com o objetivo de estimar a retenção e a exigência líquida dos minerais Na, K, Mg, S, Fe e Zn durante a gestação de cabras com um ou dois fetos. A estimativa de retenção foi baseada na diferença entre o total de cada mineral depositado no feto, útero, membranas, fluídos fetais e glândula mamária dos animais nas diferentes etapas da gestação e o total de cada mineral armazenado nas cabras vazias, utilizando-se o modelo de predição ln=A+Bx+Cx2, em que x=tempo de gestação. Os conteúdos de Na, K, Mg, S, Fe e Zn, durante as gestações de um e dois fetos foram de: 13,2 e 21,4 mg; 13,3 e 21,3 g; 2,1 e 3,7 mg; 5,5 e 9,3 mg; 575,5 e 981,0 mg; 112,6 e 164,7 mg nas gestações, resultando em exigências líquidas diárias de 0,13 e 0,11 g; 0,21 e 0,31 g; 0,06 e 0,11g; 0,17 e 0,21 g; 22,94 e 40,51 mg; 2,63 e 2,78 mg, respectivamente.This work was carried out with the purpose of evaluating the retention and the requirement of Ca e P minerals during the pregnancy of goats with one or two foetus. The estimate of retention was based in the difference between the total of each mineral stored in the foetus, uterus, membranes, fetals fluids and mammary gland of animals in the differents phases of pregnancy and the total of each mineral stored in the empty goats, using the model of prediction ln=A+Bx+Cx2, where x=time of pregnancy. The comparison of the estimative with the real values obtained show that the suggested model explained with coherence and precision the biological behavior of minerals retention during all pregnancy. The contend of Na, K, Mg, S, Fe e Zn was: 13.2 and 21.4 mg; 13.3 and 21.3 g; 2.1 and 3.7 mg; 5.5 and 9.3 mg; 575.5 and 981.0 mg; 112.6 and 164.7 mg in the pregnancy of one and two foetus, respectively, that resulted in a diary liquid requirement of 0.13 and 0.11 g; 0.21 and 0.31 g 0.06 and 0.11g; 0.17 and 0.21 g; 22.94 and 40.51 mg; 2.63 and 2.78 mg, respectively.

  14. Strategies for mitigation of nitrogen environmental impact from swine production Estratégias para minimização do impacto ambiental do azoto em suinicultura

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    Divanildo Outor Monteiro

    2010-07-01

    Full Text Available This work presents strategies that can be implemented in order to minimize the environmental impact of swine slurry on soil, water, and air. This reduction can be achieved through decrease in nitrogen excretion and ammonia emissions. The correct feed formulation according to animal requirements, the increase in diet digestibility and improvement in animal performance can reduce nitrogen excretion. The use of additives either in the diet or in the manure as well as some equipment rearrangements can reduce ammonia emission.Neste trabalho são apresentadas estratégias que podem ser implementadas para minimizar o impacto ambiental dos efluentes da produção suína sobre o solo, a água e a atmosfera. Esta redução pode ser obtida com a excreção de azoto e a sua volatilização. A formulação mais ajustada às necessidades dos animais, o aumento da digestibilidade da dieta e a melhoria do desempenho dos animais podem reduzir a excreção de azoto. O uso de aditivos nas dietas ou nos dejectos e alterações nas instalações pode reduzir a volatilização da amónia.

  15. Suplemento de vitaminas y minerales durante el períodico de gestión Vitamins and minerals supplements during pregnancy

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    Emilio Alberto Restrepo Baena

    1993-03-01

    Full Text Available

    Se presenta una revisión de los conocimientos actuales sobre la necesidad de suplementar la dieta de la embarazada con las diferentes vitaminas y minerales y se resumen los componentes de la alimentación más ricos en cada uno de ellos. Se concluye que, con excepción del hierro y, en casos específicos, el ácido fólico no se justifican tales suplementos si la embarazada ingiere una dieta adecuada.

    The need for supplementing the diet during pregnancy with vitamins and minerals is reviewed. Their main alimentary sources are summarized. It is concluded that, with the exception of Iron and of folic acid in specific situations such supplements are usually not needed If the pregnant woman receives an adequate diet.

  16. Azoto ir sieros poveikis vasarinių kviečių sausosios masės prieaugiui ir lapų plotui

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    Šiaudinis, Gintaras; Lazauskas, Sigitas

    2006-01-01

    Pastaraisiais dešimtmečiais Lietuvoje padažnėjusių sausringų laikotarpių įtaka vasarinių kviečių produktyvumui, ypač mitybos azotu ir siera aspektu, mažai tyrinėta. Azoto ir sieros įtaka vasarinių kviečių sausųjų medžiagų ir lapų ploto prieaugiui tirta 2003-2005 m. Lietuvos žemdirbystės institute. Lauko bandymai atlikti pagal dviejų veiksnių schemą, kurioje buvo trys tręšimo azotu (0, 60, 120 kg ha-1) bei trys tręšimo siera (0, 15, 30 kg ha-1) lygiai. Vasarinių kviečių vegetacijos metu kas sa...

  17. Recuperação de azoto de origem orgânica e inorgânica pela cultura da couve repolho (Brassica oleracea var. capitata Organic and inorganic nitrogen recovery by white cabbage (Brassica oleracea var. capitata

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    Luis Miguel Brito

    2011-07-01

    Full Text Available Avaliou-se a resposta da couve repolho à aplicação de um fertilizante mineral nas doses de 0, 90 e 180 kg ha-1 de N em combinações com um fertilizante orgânico, resultante da compostagem durante 182 dias da fracção sólida de chorume, nas doses de 0, 20 e 40 t ha-1, através de uma experiência de arranjos sistemáticos com o objectivo de investigar o efeito da utilização deste composto no crescimento e na absorção de N com e sem aplicação do fertilizante mineral azotado. A produção de couve repolho dependeu fortemente da aplicação do adubo mineral azotado e da aplicação do composto quando não se aplicou adubo. O aumento de aplicação de N mineral de 90 para 180 kg ha-1 aumentou a acumulação de N na couve, mas o correspondente aumento de peso não foi significativo. Recomenda-se a aplicação do composto da FSC até doses de 20 t ha-1, particularmente quando não se aplica adubo mineral.The response of white cabbage to increasing rates of a mineral fertilizer (0, 90 and 180 kg ha-1 of mineral nitrogen combined with increasing rates (0, 20 and 40 t ha-1 of an organic fertilizer resulting from the composting process (182 days of the solid fraction of dairy cattle slurry, was assessed throughout a systematically arranged experiment to investigate the effect of this compost on cabbage growth and N uptake, with and without mineral N application. Cabbage yield was strongly related to mineral N application and to compost application in treatments without mineral N fertilizer. The increase on mineral N application from 90 to 180 kg ha-1 increased cabbage N uptake but not significantly cabbage yield. The application of this compost to cabbage crop is recommended up to 20 t ha-1, particularly when mineral N is not applied.

  18. Adubação do milho: III - Adubação mineral quantitativa Fertilizer experiments with corn: III - Quantitative applications of mineral fertilizers

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    G. P. Viégas

    1955-01-01

    Full Text Available Durante três anos consecutivos - de 1949/50 a 1951/52 - foram realizados em Campinas, ensaios de adubação do milho, em que as doses básicas de NPK foram iguais para os três elementos, isto é, 25 kg/ha de azoto (N, fósforo (P2O5 e potássio (K2O. Foram estudados três níveis de azoto, cinco de fósforo e quatro de potássio. Em 1949/50, em todos os tratamentos o "stand" inicial foi baixo ; nos outros dois anos, a genninação média foi respectivamente de 79% e 72%. Em conseqüência de aparente desequilíbrio na adubação, provocado por deficiência de fósforo, houve acentuada redução no número de plantas por ocasião da colheita, particularmente em 1951/52, nos canteiros sem fósforo e sem adubo. Apenas a adubação fosfatada deu efeitos significativos, obtendo-se o maior aumento de produção com 60 kg/ha de P2O5. O efeito do fósforo ampliou-se do primeiro para o terceiro ano. Em média, o efeito do potássio foi pequeno, devido aos resultados obtidos nos dois primeiros anos; no último, êle cresceu consideravelmente. Em 1949/50, verificou-se ter sido prejudicada a genninação, devido à concentração do cloreto de potássio nos sulcos de plantio. O aumento de produção pela aplicação de azoto também foi pequeno, diminuindo proporcionalmente, do primeiro para o terceiro ano, ao contrário do fósforo e do potássio. Nos dois primeiros anos o melhor tratamento foi 121; no último foi 131, isto é 25 - 75 - 25 kg/ha de N - P2O5 - K2O. A produção de colmos reagiu do mesmo modo que a de grãos, porém em menor escala. Pode-se dizer que houve geral concordância entre as produções de grãos e de colmos, às crescentes doses de azoto, fósforo e potássio, aplicadas.Experiments designed to compare three levels of nitrogen, five of phosphorus, and four of potash were planted for three consecutive years (1949 through 1951 at Campinas in the "terra roxa misturada" type of soil. Treatment 1-1-1 received 25 kg/ha of each, N, P2O5

  19. Del asentamiento minero al espacio continental: Chuquicamata (Chile y la contribución de la minería a la configuración del territorio y el desarrollo social y económico de la Región de Antofagasta durante el siglo XX

    Directory of Open Access Journals (Sweden)

    EUGENIO GARCES FELIÚ

    2010-04-01

    Full Text Available El presente paper tiene por objetivo analizar las contribuciones de Chuquicamata al desarrollo territorial, social y económico de la II Región de Antofagasta durante el siglo XX, a partir de su condición de complejo industrial y company town minero, que evoluciona desde las rentas y aportes propios de un campamento del cobre hasta su despliegue a escala regional, con alcances y encadenamientos continentales, contribuyendo al desarrollo social y económico de la región y el país. En esta perspectiva, el Norte de Chile y, en particular esta región, ostentan importantes ventajas comparativas y competitivas, extensivas al siglo XXI, tanto para la explotación de minerales como para su encadenamiento con otros sectores productivos, en un proceso que genera nuevas configuraciones de ordenamiento territorial, basadas no sólo en la dinámica urbana de los company totvns sino que también en la extensión y complejidad del "territorio minero", activado económicamente por la minería.This article analyzes the contributions of Chuquicamata to the territorial, social and economic development of the II Region of Antofagasta during the twentieth century. The process begins with the local contributions of an industrial complex and company town, that evolves from profits and contributions specific to a copper mining settlement to a situation of regional significance, generating continental economic relations and linkages which contribute to the social and economic development of the region and he country. From this perspective, Northern Chile, and this region in particular, hold important comparative and competitive advantages that extend into the twenty first century, both for the exploitation of mineral resources and for increasing linkages with other productive sectors, in a process that generates new spatial configurations, based not only on the urban dynamics of the company town, but also through the extent and complexity of the mining territory

  20. portland durante el proceso de hidratación

    Directory of Open Access Journals (Sweden)

    MANUEL ALEJANDRO GIRALDO M.

    2006-01-01

    Full Text Available Se presenta la evolución mineralógica del cemento Pórtland tipo I durante el proceso de hidratación, usando las técnicas de caracterización de materiales difracción de rayos X (DRX y microscopia electrónica de barrido (SEM, con el fin de entender los cambios que se dan en los minerales anhidros del cemento (alita, belita, celita y felita entre otros durante su transformación en las fase estables hidratadas (tobermorita, ortlandita, etringita, etc.. Se encontró que, en general, el proceso de hidratación ocurre de manera diferente en cada mineral ya sea por la velocidad de reacción, o por los cambios cristalinos experimentados por éstos durante la transformación de fase anhidra a hidratada. Se pudo apreciar la formación de tobermorita gel (CSH, portlandita y etringita primaria. Además, como cambia la apariencia de la pasta a medida que avanza la hidratación.

  1. Evolución de los fluídos hidrotermales durante el proceso de mineralización y alteración en el distrito minero Hualilán, Provincia de San Juan Hydrothermal fluids during mineralization and alteration in the Hualilan Mining District, province of San Juan

    Directory of Open Access Journals (Sweden)

    L. Bengochea

    2006-03-01

    Full Text Available Se ha realizado el estudio detallado de las inclusiones fluidas en los intrusivos dacíticos del distrito minero Hualilán con el fin de evaluar la evolución de los procesos hidrotermales intervinientes durante las etapas de mineralización y alteración que afectaron a estas rocas. Hualilán está ubicado a 120 km al nornoroeste de la ciudad de San Juan. El estudio de muestras de áreas representativas de los sectores norte (Falla Sánchez y sur (Magnata permite establecer que han existido dos períodos de circulación de fluidos hidrotermales con características bien definidas. En el primero, que puede ser considerado como el responsable de la mineralización primaria de sulfuros, la temperatura superó holgadamente los 300ºC, con un episodio de ebullición responsable de la depositación de los minerales de mena. La salinidad promedio fue de 12 % en peso eq. NaCl, con una participación importante de CaCl2. El segundo período tuvo una temperatura inferior a 300ºC, también con un episodio de ebullición, y una salinidad promedio de 4,5 % en peso eq. NaCl, sin participación de calcio. Este segundo episodio puede ser considerado el responsable de la intensa oxidación hipogénica que sufrió la mineralización primaria llegando a desaparecer como tal en amplios sectores y produciendo además el total enmascaramiento de los minerales calco-silicáticos, la alteración de los diques dacíticos, la formación en superficie de cuerpos de jasperoide relacionados a las fallas normales, y la formación de minerales típicos de una alteración ácido-sulfática, sobreimpuestos a la primer alteración de illita, caolinita, adularia. Este segundo episodio ha sido más intenso en el sector norte (Falla Sánchez que en el sector sur.The detailed study of the fluid inclusions in the dacitic intrusions of Hualilan mining district has been carried out to evaluate the evolution of the hydrothermal processes during the stages of mineralization and

  2. Resposta da couve Tronchuda (Brassica oleracea var. costata à aplicação de azoto e boro e de um fertilizante orgânico autorizado em Agricultura Biológica Tall cabbage (Brassica oleracea var. costata response to the application of nitrogen, boron and an organic amendment permitted in organic farming

    Directory of Open Access Journals (Sweden)

    M. A. Rodrigues

    2009-01-01

    Full Text Available Os portugueses são dos maiores apreciadores mundiais de brássicas. A couve Tronchuda é cultivada em Portugal em área superior a 1000 ha. O seu consumo é sobretudo apreciado na quadra natalícia. Neste trabalho reportam-se resultados da fertilização com azoto e boro, na forma de adubos convencionais, e da utilização de Dix10 (com ˜10 % N total, um fertilizante orgânico autorizado em agricultura biológica. Plantas de raiz protegida foram transplantadas a 29 de Agosto de 2005 num compasso 0,8x0,5 m. O solo, de textura franca, continha 0,83 % matéria orgânica, 5,2 pH(H2O e teores em P e K médios e altos, respectivamente. Foram estabelecidas seis modalidades: sem adubação (SAd; Dix10, em dose equivalente a 80 kg N/ha; modalidades com 80 (NB e 160 (N+ kg N/ha, na forma de ureia; e modalidades sem B (B- e com aplicação de 2,2 (NB e 4,4 (B+ kg B/ha. Todas as modalidades de B foram fertilizadas com 80 kg N/ha e as de N com 2,2 kg B/ha, coincidindo na modalidade NB as doses médias de N e B. As plantas SAd produziram 13,7 Mg biomassa/ha e exportaram 33,9 kg N/ha e 40,9 g B/ha, valores significativamente inferiores às modalidades fertilizadas. Dix10 produziu 18,0 Mg de biomassa/ha e exportou 45,1 kg N/ha e 51,3 g B/ha. A modalidade NB originou maior produção de biomassa (38,6 Mg/ha e N exportado (107,9 kg/ha que as modalidades SAd e Dix10. A modalidade N+ não registou aumento de produção nem de N exportado comparativamente com NB. B+ não influenciou a produção de biomassa mas aumentou a concentração de B nos tecidos e o B exportado. N+ reduziu significativamente a concentração de B nos tecidos e o B exportado, sugerindo um efeito de antagonismo da aplicação de N sobre a absorção de B. As produções obtidas e a recuperação aparente de nutrientes mostraram que a redução de produção de biomassa nas modalidades SAd e Dix10 se deveu à reduzida disponibilidade de N no solo durante a estação de crescimento

  3. Mineral resources

    NARCIS (Netherlands)

    Henckens, M.L.C.M.; Ierland, van E.C.; Driessen, P.P.J.; Worrell, E.

    2016-01-01

    The extractable ores of the world's geologically scarcest mineral resources (e.g. antimony, molybdenum and zinc) may be exhausted within several decades to a century, if their extraction continues to increase. This paper explores the likelihood that these scarce mineral resources can be conserved

  4. Mineral Quantification.

    Science.gov (United States)

    2016-01-01

    Optimal intakes of elements, such as sodium, potassium, magnesium, calcium, manganese, copper, zinc and iodine, can reduce individual risk factors including those related to cardiovascular diseases among humans and animals. In order to meet the need for vitamins, major minerals, trace minerals, fatty acids and amino acids, it is necessary to include a full spectrum programme that can deliver all of the nutrients in the right ratio. Minerals are required for normal growth, activities of muscles, skeletal development (such as calcium), cellular activity, oxygen transport (copper and iron), chemical reactions in the body, intestinal absorption (magnesium), fluid balance and nerve transmission (sodium and potassium), as well as the regulation of the acid base balance (phosphorus). The chapter discusses the chemical and instrumentation techniques used for estimation of minerals such as N, P, Ca, Mg, K, Na, Fe, Cu, Zn, B and Mb. PMID:26939263

  5. Mineral Resources

    OpenAIRE

    Ababsa, Myriam

    2014-01-01

    Jordan’s natural resources are very limited: water is scarce, there is little arable land and the country has few sources of energy (fig. I.11). Jordan’s mineral industry has a long history: flint was used in prehistoric times and early copper mining started in Wadi Faynan during the Chalcolithic Period. The following is a brief presentation of Jordan’s resources. Mining and investments will be studied in Part 3. Figure I.11 — Jordan Mineral Resources. NRA 2012 Phosphates The Jordanian Natur...

  6. Fontes protéicas suplementadas com aminoácidos e minerais para a tilápia do Nilo durante a reversão sexual Protein sources supplemented with amino acids and minerals to Nile tilapia during sex reversal phase

    Directory of Open Access Journals (Sweden)

    Fábio Meurer

    2005-02-01

    Full Text Available Objetivou-se, no presente experimento, comparar o efeito da origem da fonte protéica e da suplementação com lisina e metionina ou cálcio e fósforo para a tilápia do Nilo (Oreochromis niloticus, durante a reversão sexual. Foram utilizadas 200 larvas, distribuídas em 20 aquários de 12 litros, em um delineamento inteiramente casualizado em quatro tratamentos e cinco repetições. A temperatura pela manhã e à tarde, o oxigênio dissolvido, pH e condutividade elétrica da água foram, respectivamente, de 22,6 ± 0,1ºC, 24,1±0,4ºC; 6,77 ± 0,38 mg/L, 7,75 ± 0,16; e 173,4 ± 2 mS/m. Os tratamentos foram compostos por quatro rações isoprotéicas e isoenergéticas: uma somente com ingredientes de origem animal (FA; outra com ingredientes de origem vegetal (FV e duas com ingredientes de origem vegetal, uma com adição dos aminoácidos lisina e metionina (FAA e outra com cálcio e fósforo (FP. Os valores médios finais de peso e comprimento dos animais submetidos à ração FA foi superior aos demais tratamentos, seguido pelo FP e FV, que não diferiram da FAA. O tratamento FA apresentou os maior valores de biomassa final, seguido do FP e FAA, que foram semelhantes ao FV. O fator de condição dos peixes do tratamento FA foi superior aos FAA e FV, porém o FP foi semelhante aos demais. A sobrevivência dos tratamentos FA, FV e FP foram semelhantes entre si e superiores ao FAA. Para a fase de reversão sexual da tilápia do Nilo, rações formuladas com ingredientes de origem animal foram mais eficientes que as formuladas com ingredientes de origem vegetal, mesmo quando estas foram suplementadas com lisina e metionina ou cálcio e fósforo.This work aimed to evaluate the effect of protein source origin and lysine and methionine or phosphorus and calcium supplementation to Nile tilapia during sex reversal phase. Two hundred fries were assigned to a completely randomized design with four treatments and five replications, in twenty 12 L

  7. Avaliação da libertação de azoto a partir de correctivos orgânicos utilizando membranas de troca aniónica e um medidor de clorofila SPAD-502 Nitrogen release from organic amendments assessed by using anion exchange membranes and the SPAD-502 chlorophyll meter

    Directory of Open Access Journals (Sweden)

    A. Pereira

    2009-01-01

    Full Text Available Neste trabalho divulgam-se resultados de experiências em vasos em que membranas de troca aniónica (MTA foram inseridas directamente no solo para monitorar o teor de nitratos ao longo do tempo, e em que o estado nutritivo dasplantas foi avaliado através de um medidor de clorofila SPAD-502. Na estação quente foi cultivado milho e no período outono-inverno nabiça e centeio. O milho foi semeado a 5 de Junho de 2004 e a nabiça e o centeio a 23 de Setembro de 2004. As plantas foram sujeitas aos seguintes tratamentos fertilizantes: Nutrisoil (Nut; Beiraadubo (Bei; Phenix (Phe; e Vegethumus (Veg, quatro correctivos orgânicos comerciais; estrume de bovino (EB; casca de castanha (CC; nitrato de amónio (NA; e um tratamento sem azoto (T. Os resultados das MTA e os valores SPAD foram relacionados com a matéria seca produzida e o N exportado. Em Junho, na primeira amostragem, a concentração média de nitratos nos extractos das MTA variou entre 18,3 e 239,4 mg L-1, nos tratamentos CC e NA. Na primeira semana de Agosto, foram registados valores médios de nitratos no solo de 12,9 a 52,3 mg L-1 nos tratamentos CC e Bei. Na última amostragem, em Setembro, os valores médios de nitratos no solo variaram entre 9,7 e 67,9 mg L-1 nos tratamentos CC e Nut. As MTA revelaram boa capacidade para discriminar a forma como os diferentes fertilizantes libertaram o azoto ao longo do tempo e como este aspecto condicionou a absorção do nutriente e o desenvolvimento das plantas. Os valores SPAD revelaram-se bons indicadores do estado nutritivo azotado do milho, em condições em que foi possível controlar grande parte da variabilidade experimental. Os valores SPAD estiveram linearmente relacionados com a produção de matéria seca e o N exportado. Nas condições deste ensaio, em que a lixiviação e a desnitrificação foram controladas, as culturas intercalares centeio e nabiça recuperaram o N residual da cultura anterior até próximo do limite da sua

  8. ERCP during pregnancy CPRE durante el embarazo

    Directory of Open Access Journals (Sweden)

    Jesús García-Cano

    2012-02-01

    Full Text Available Background and aims: ERCP during pregnancy is always challenging for the entire team performing the endoscopic intervention. In this study techniques and different interventional aspects used at several centres about the clinical experience on ERCP in pregnant women are analyzed. Patients and methods: the practice on ERCP in pregnant women in six centers during a period of ten years is reported. Results: eleven patients were included in the study. Mean age was 30.6 years. Indication for ERCP was always symptomatic common bile duct stone (CBDS disease. Before the procedure abdominal ultrasound was performed at all times and magnetic resonance cholangiopancreatography in four occasions. Conscious sedation by means of midazolam and fentanyl or meperidine was applied. Sphincterotomes and guidewires were used for bilary cannulation. Sometimes, rapid exchange platforms with short-length guidewires controlled by the same endoscopist were employed. Biliary cannulation was confirmed in 9 occasions by bile aspiration. In five procedures, a mean of 30 seconds of fluoroscopy was used, both to verify cannulation and to corroborate complete CBDS clearance. These patients had the pelvic zone protected with a lead shield and radiation dose was measured. Ten biliary sphincterotomies were performed followed by CBDS extraction. Two plastic stents were inserted. Relief of biliary obstruction was attained in all circumstances. Only one patient had hyperamylasemia after ERCP. All pregnant women had healthy foetuses with normal deliveries. Conclusions: with experience, ERCP appears to be a safe technique during pregnancy. With simple measures fluoroscopic time can be diminished or even abolished. It seems that ERCP during pregnancy is underused in our working areas, although it has shown to be a useful technique for relieving biliary obstruction.Antecedentes y objetivos: la CPRE realizada durante el embarazo constituye siempre un reto para todo el equipo que participa

  9. Diez consejos para prevenir infecciones durante el embarazo

    Centers for Disease Control (CDC) Podcasts

    2007-12-14

    Este podcast ofrece 10 consejos para prevenir infecciones durante el embarazo.  Created: 12/14/2007 by National Center for Birth Defects and Developmental Disabilities (NCBDDD).   Date Released: 2/27/2008.

  10. Trade in mineral resources

    OpenAIRE

    Davis, Graham A.

    2010-01-01

    This paper provides a review of current thinking on the economics of international trade in mineral resources. I first define what is meant by trade in mineral resources. I then discuss patterns of trade in mineral resources. The paper then moves on to the five topics requested by the World Trade Organization: theoretical and empirical literature on international trade in minerals; trade impacts of mineral abundance and the resource curse; the political economy of mineral trade in resource-ab...

  11. Determinants of pathologic mineralization.

    Science.gov (United States)

    Kirsch, Thorsten

    2008-01-01

    Physiologic mineralization is necessary for the formation of skeletal tissues and for their appropriate functions during adulthood. Mineralization has to be controlled and restricted to specific regions. If the mineralization process occurs in regions that normally do not mineralize, there can be severe consequences (pathologic or ectopic mineralization). Recent findings have indicated that physiologic and pathologic mineralization events are initiated by matrix vesicles, membrane-enclosed particles released from the plasma membranes of mineralization-competent cells. The understanding of how these vesicles are released from the plasma membrane and initiate the mineralization process may provide novel therapeutic strategies to prevent pathologic mineralization. In addition, other regulators (activators and inhibitors) of physiologic mineralization have been identified and characterized, and there is evidence that the same factors also contribute to the regulation of pathologic mineralization. Finally, programmed cell death (apoptosis) may be a contributor to physiologic mineralization and if occurring after tissue injury may induce pathologic mineralization and mineralization-related differentiation events in the injured and surrounding areas. This review describes how the understanding of mechanisms and factors regulating physiologic mineralization can be used to develop new therapeutic strategies to prevent pathologic or ectopic mineralization events.

  12. Efeito da rega com injecção de ar na humidade do solo, dis­ponibilidade de azoto nítrico, condutividade eléctrica e pro­dutividade da alface cultivada em estufa plástica Effects of irrigation with injection of air in soil moisture, nitrate avail­ability, electrical conductivity and lettuce productivity grown in plastic greenhouse

    Directory of Open Access Journals (Sweden)

    C.R. Pivetta

    2010-01-01

    Full Text Available Este trabalho teve como objectivo veri­ficar se a injecção de ar junto a água de rega gota-a-gota enterrada, afecta a humi­dade do solo, a disponibilidade de azoto nítrico, a condutividade eléctrica e o cres­cimento e produtividade da alface. Para tal realizou-se um ensaio com a alface variedade “Mention” cultivada em estufa plástica e localizada na Herdade Experi­mental da Mitra-ICAAM, da Universida­de de Évora -Portugal. Utilizou-se o deli­neamento experimental blocos ao acaso com quatro repetições, com os tratamen­tos: rega com injecção de ar (CAR, e rega sem injecção de ar (SAR. O ar foi introdu­zido na água de rega por meio de um injector “Mazzei”. O teor de humidade na camada superficial (0-0,05 m foi seme­lhante para os dois tratamentos, alcançan­do valores em torno de zero. Em termos de concentração de azoto nítrico (NO 3- os valores observados na camada 0,10­0,20 m, aos 35 e 47 dias após a transplan­tação, foram mais elevados no tratamento CAR. Aos 47 dias após a transplantação, os níveis médios de NO3-foram de 95,33 e 67,94 ppm nos tratamentos CAR e SAR, respectivamente. A densidade radical no tratamento CAR na camada de 0-0,10 m do solo foi 34 % superior em relação ao SAR. A produção comercial não foi afectada pelo tratamento. A falta de resposta da cultura ao acréscimo de azoto nítrico e da densidade radical pode estar relacionada com o curto ciclo da cultura e/ou com o elevado teor de azoto presente no solo, ou ainda com a profundidade que os goteja­dores foram instalados e não com a fun­cionalidade do injector de ar.The objective of the present study was to evaluate the effect of the air injection through subsurface drip irrigation (oxyga­tion in soil moisture, availability of nitro­gen oxide, and electrical conductivity, plant growth and yield of lettuce, variety "Men­tion", cultivated in plastic greenhouse. The experiment was carried out at the Mitra-ICAM, an Experimental

  13. Ensaios com cultivares de colza de inverno, doses de azoto e profundidades de sementeira em Trás-os-Montes Studies on rapeseed winter cultivars, nitrogen rates and seeding depths in Northeastern Portugal

    Directory of Open Access Journals (Sweden)

    Manuel Ângelo Rodrigues

    2010-12-01

    Full Text Available Durante as estações de crescimento de 2007/08 e 2008/09 foram conduzidos ensaios de campo com variedades de Inverno de colza na Quinta de Sta. Apolónia em Bragança. O ensaio de 2007/08 incluiu quatro cultivares (Lucia, Recital, Nelson, NK Ready e três modalidades de fertilização azotada [fundo+cobertura (0+50, 25+75 e 50+100 kg N ha-1], numa experiência organizada em split-plot com as cvs. inseridas em main-plots e a adubação em subplots. O ensaio de 2008/09 incluiu mais quatro cvs. (PR46W10, PR46W14, PR46W31 e PR45D01, num total de oito, sendo a experiência organizada de forma completamente casualizada. Em estufa decorreu um ensaio de germinação com as oito cvs. e quatro profundidades de sementeira (1, 4, 8 e 12 cm. Em 2007/08 a produção de semente não foi estatisticamente diferente entre cultivares. Em média atingiu-se uma produção de semente próxima de 3000 kg ha-1, em resposta a uma Primavera particularmente chuvosa e fresca. Em 2008/09 a produção foi bastante inferior, limitada por uma estação anormalmente seca nos meses de Março, Abril e Maio. Em média obteve-se um terço (1000 kg ha-1 da produção do ano anterior. No segundo ano, as diferenças entre cvs. foram significativas, variando a produção entre 851 e 1558 kg ha-1 nas cvs. PR46W14 e Nelson, respectivamente. Não se registaram diferenças significativas entre doses de N, sugerindo o resultado que será possível obter boas produções com doses moderadas do nutriente. Os dados da evolução fenológica das plantas recomendam uma sementeira precoce, de preferência ainda em Setembro, de forma a assegurar um bom desenvolvimento vegetativo inicial. Apesar do reduzido tamanho da semente, os resultados revelaram que até 4 cm de profundidade não ocorre redução significativa na percentagem de germinação.Field experiments with rapeseed winter cultivars were carried out during the growing seasons of 2007/08 and 2008/09 in the Sta Apolónia farm in Bragan

  14. Cuidados paliativos durante el cáncer

    Science.gov (United States)

    Describe la función de los cuidados paliativos, los cuales son los cuidados que se brindan a pacientes que tienen una enfermedad grave o potencialmente letal, como el cáncer, desde el momento del diagnóstico y durante todo el curso de la enfermedad.

  15. Mineral Resources Data System

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — Mineral resource occurrence data covering the world, most thoroughly within the U.S. This database contains the records previously provided in the Mineral Resource...

  16. Construction Minerals Operations

    Data.gov (United States)

    Department of Homeland Security — This map layer includes construction minerals operations in the United States. The data represent commodities covered by the Minerals Information Team (MIT) of the...

  17. Chelated minerals for poultry

    OpenAIRE

    SL Vieira

    2008-01-01

    Organic minerals have been subject of an increasing number of investigations recently. These compounds can be considered the most significant event regarding commercial forms of minerals targeting animal supplementation in the last decades. Minerals, especially metals, are usually supplemented in poultry feeds using cheap saline sources and have never required a lot of attention in terms of quality. On the other hand, definitions of organic minerals are very broad and frequently lead to confu...

  18. Mineral Supply Challenges

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Faced with shortcomings in its mineral supply, it’s imperative for China to balance its desire for reserves with its current economic needs Mineral resources are the corner- stone of materials needed for China’s national economic and social development.The country even counts on its mineral resources to satisfy 90 percent of its energy demands and over 95

  19. Fissure minerals, literature review

    International Nuclear Information System (INIS)

    This paper is a review of methods used for direct and indirect dating of tectonic events. Isotope geochemistry including stable isotopes as well as fission track- dating, fluid inclusion and thermoluminescens techniques have been considered. It has been concluded that an investigation of tectonic (and thermal) events should start with a detailed study of the mineral phases grown in seald fissures as well as minerals from fissure walls. This study should include phase identification, textures as well as mineral chemistry. The information from this study is fundamental for the decision of further investigations. Mineral chemistry including isotopes and fluid inclusion studies will give an essential knowledge about crystallization conditions for fissure minerals concerned. Direct dating using fission tracks as well as radioactive isotopes could be useful for some minerals. Application of thermoluminescens dating on fissure minerals is doubtful. (Auth.)

  20. Chelated minerals for poultry

    Directory of Open Access Journals (Sweden)

    SL Vieira

    2008-06-01

    Full Text Available Organic minerals have been subject of an increasing number of investigations recently. These compounds can be considered the most significant event regarding commercial forms of minerals targeting animal supplementation in the last decades. Minerals, especially metals, are usually supplemented in poultry feeds using cheap saline sources and have never required a lot of attention in terms of quality. On the other hand, definitions of organic minerals are very broad and frequently lead to confusion when decision-making becomes necessary. Organic minerals include any mineral bound to organic compounds, regardless of the type of existing bond between mineral and organic molecules. Proteins and carbohydrates are the most frequent candidates in organic mineral combinations. Organic fraction size and bond type are not limitations in organic mineral definition; however, essential metals (Cu, Fe, Zn, and Mn can form coordinated bonds, which are stable in intestinal lumen. Metals bound to organic ligands by coordinated bonds can dissociate within animal metabolism whereas real covalent bonds cannot. Chelated minerals are molecules that have a metal bound to an organic ligand through coordinated bonds; but many organic minerals are not chelates or are not even bound through coordinated bonds. Utilization of organic minerals is largely dependent on the ligand; therefore, amino acids and other small molecules with facilitated access to the enterocyte are supposed to be better utilized by animals. Organic minerals with ligands presenting long chains may require digestion prior to absorption. After absorption, organic minerals may present physiological effects, which improve specific metabolic responses, such as the immune response. Many studies have demonstrated the benefits of metal-amino acid chelates on animal metabolism, but the detection positive effects on live performance is less consistent.

  1. Modellizzazione del comportamento dell'azoto nei bacini fluviali selezionati

    OpenAIRE

    MARCHETTO, Aldo; Tornimbeni, Ombretta; Rogora, Michela; Ciampittiello, Marzia

    2012-01-01

    This deliverable aims to the quantification of the amount of nitrogen compounds reaching the InHabit lakes from atmospheric deposition. In effect, nitrogen is one of a number of pollutants that can reach lake water through atmospheric dry or wet deposition, escaping from the conceptual pattern of the Water Framework Directive, which assumes that pollutants will reach the waterbodies along watercourses within the River Basins. We estimated the atmospheric load of total nitrogen, both in the ox...

  2. Reagan issues mineral policy

    Science.gov (United States)

    The National Materials and Minerals Program plan and report that President Reagan sent to Congress on April 5 aims to ‘decrease America's minerals vulnerability’ while reducing future dependence on potentially unstable foreign sources of minerals. These goals would be accomplished by taking inventory of federal lands to determine mineral potential; by meeting the stockpile goals set by the Strategic and Critical Material Stockpiling Act; and by establishing a business and political climate that would encourage private-sector research and development on minerals.Now that the Administration has issued its plan, the Subcommittee on Mines and Mining of the House Committee on Interior and Insular Affairs will consider the National Minerals Security Act (NMSA), which was introduced 1 year ago by subcommittee chairman Jim Santini (D-Nev.) [Eos, May 19, 1981, p. 497]. The bill calls for establishing a three-member White-House-level council to coordinate the development of a national minerals policy; amending tax laws to assist the mining industry to make capital investments to locate and produce strategic materials; and creating a revolving fund for the sale and purchase of strategic minerals. In addition, the NMSA bill would allow the secretary of the interior to make previously withdrawn public lands available for mineral development. The subcommittee will hold a hearing on the Administration's plan on May 11. Interior Secretary James Watt has been invited to testify.

  3. Vitamins, Minerals, and Mood

    Science.gov (United States)

    Kaplan, Bonnie J.; Crawford, Susan G.; Field, Catherine J.; Simpson, J. Steven A.

    2007-01-01

    In this article, the authors explore the breadth and depth of published research linking dietary vitamins and minerals (micronutrients) to mood. Since the 1920s, there have been many studies on individual vitamins (especially B vitamins and Vitamins C, D, and E), minerals (calcium, chromium, iron, magnesium, zinc, and selenium), and vitamin-like…

  4. Luobusaite: A New Mineral

    Institute of Scientific and Technical Information of China (English)

    BAI Wenji; SHI Nicheng; FANG Qingsong; LI Guowu; XIONG Ming; YANG Jingsui; RONG He

    2006-01-01

    A group of mantle minerals including about 70-80 subtypes of minerals are discovered from a podiform chromitite in Tibet, China. Recovered minerals include diamond, coesite, moissanite,wustite, Fe-silides and a new mineral, luobusaite. All of these minerals were hand-picked from heavy-mineral separates of the podiform chromitite in the mantle peridotite of an ophiolite. The grains of luobusaite are as host mineral with inclusions of native silicon or as an intergrowth with native silicon and Fe-Si phase. Luobusaite occurs as irregular grains, with 0.1-0.2 mm in size, consisting of very finegrained aggregates. The mineral is steel-grey in color, metallic luster, and opaque. The empirical formula (based on 2 for Si) is Fe0.83Si2, according to the chemical compositions of luobusaite. X-ray powder-diffraction data: orthorhombic system, space group Cmca, a = 9.874 (14) (A), b = 7.784 (5) (A), c=7.829(7) (A), Z=16.

  5. Lithium mineral waters

    Directory of Open Access Journals (Sweden)

    Munteanu Constantin

    2011-02-01

    Full Text Available Hydrological surveys showed that Romania basement contains a variety of balneary resources located within on the surface crust. Mineral waters are spread over more than 20% of the country at different depths, with a wide range of physical, chemical and therapeutic properties depending on their genesis.Balneary resources are represented mainly by therapeutic minerals that the physicochemical properties answer the needs of medical and prophylactic maintenance, enhancement and restoration of health, work capacity and physical and mental comfort of the individual.The surface waters arising from a natural source or updated by drilling and whose physical and chemical characteristics that may exert dynamic pharmaco-therapeutic are considered therapeutic mineral waters. Mineral waters are waters that have a variable content of salts, gas, minerals, radioactive elements, which gives them therapeutic properties. In the past, name of mineral water was attributed to all shallow or groundwater mineral water that could be used for therapeutic purposes. In recent years, mineral water that could be used for therapeutic purposes have been given the name of curative water.Lithium arouses a great scientific interest because, although his structure is so simple, easy to analyze, with chemical and physical properties well established the myriad of the effects on biological systems by influencing many cellular processes and molecular and the mechanism of action are still unclear generates a mystery that modern science attempting to decipher.

  6. Mineral commodity summaries 2016

    Science.gov (United States)

    Ober, Joyce A.

    2016-01-01

    This report is the earliest Government publication to furnish estimates covering 2015 nonfuel mineral industry data. Data sheets contain information on the domestic industry structure, Government programs, tariffs, and 5-year salient statistics for more than 90 individual minerals and materials

  7. Mineral Commodity Summaries 2007

    Science.gov (United States)

    U.S. Geological Survey

    2007-01-01

    Published on an annual basis, this report is the earliest Government publication to furnish estimates covering nonfuel mineral industry data. Data sheets contain information on the domestic industry structure, Government programs, tariffs, and 5-year salient statistics for over 90 individual minerals and materials.

  8. Surface miner MTS 1250

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, D. [MAN TAKRAF Foerdertechnik GmbH, Leipzig (Germany). Mining and Machinery Planning dept.

    1999-10-01

    The German manufacturer MAN TAKRAF Foerdertechnik GmbH has developed a new series of surface miners with capacities ranging between 500-2000 bm{sup 3}/h. The Surface Miner MTS 1250, launched at MINETIME '99, is described in this article. 1 tab., 1 photo.

  9. Violência durante o sono Violent behavior during sleep

    Directory of Open Access Journals (Sweden)

    Dalva Poyares

    2005-05-01

    Full Text Available Casos de comportamento violento (CV durante o sono são relatados na literatura. A incidência de comportamento violento durante o sono não é muito conhecida. Um estudo epidemiológico mostra que cerca de 2% da população geral apresentava comportamento violento dormindo e eram predominantemente homens. Neste artigo, os autores descrevem aspectos clínicos e médico-legais envolvidos na investigação do comportamento violento. O comportamento violento se refere a ferimentos auto-infligidos ou infligidos a um terceiro durante o sono. Ocorre, muito freqüentemente, seguindo um despertar parcial no contexto de um transtorno de despertar (parassonias. Os transtornos do sono predominantes diagnosticados são: transtorno de comportamento REM e sonambulismo. O comportamento violento poderia ser precipitado pelo estresse, uso de álcool e drogas, privação do sono ou febre.Cases of violent behavior during sleep have been reported in the literature. However, the incidence of violent behavior during sleep is not known. One epidemiological study showed that approximately 2% of the general population, predominantly males, presented violent behavior while asleep. In the present study, the authors describe clinical and medico-legal aspects involved in violent behavior investigation. Violent behavior refers to self-injury or injury to another during sleep. It happens most frequently following partial awakening in the context of arousal disorders (parasomnias. The most frequently diagnosed sleep disorders are REM behavior disorder and somnambulism. Violent behavior might be precipitated by stress, use of alcohol or drugs, sleep deprivation or fever.

  10. Underground mineral extraction

    Science.gov (United States)

    Miller, C. G.; Stephens, J. B.

    1980-01-01

    A method was developed for extracting underground minerals such as coal, which avoids the need for sending personnel underground and which enables the mining of steeply pitched seams of the mineral. The method includes the use of a narrow vehicle which moves underground along the mineral seam and which is connected by pipes or hoses to water pumps at the surface of the Earth. The vehicle hydraulically drills pilot holes during its entrances into the seam, and then directs sideward jets at the seam during its withdrawal from each pilot hole to comminute the mineral surrounding the pilot hole and combine it with water into a slurry, so that the slurried mineral can flow to a location where a pump raises the slurry to the surface.

  11. Apropiacions de la premsa a Catalunya durant la Guerra Civil

    OpenAIRE

    Figueres, Josep M. (Josep Maria), 1950-

    1997-01-01

    L'article fa una exhaustiva repassada del panorama de la premsa apropiada i col·lectivitzada durant la Guerra Civil espanyola. El fenomen, encara poc estudiat, presenta una gran varietat de matisos i particularitats. A més del relat històric de diferents casos de diaris apropiats i col·lectivitzats, amb el testimoni de diversos protagonistes que ho visqueren, la present recerca inclou una valoració de l'abast del procés i taules sobre els diaris ja existents, apropiats, transformats o de nova...

  12. Autonomía emocional durante la adolescencia

    OpenAIRE

    Oliva Delgado, Alfredo; Parra Jiménez, Agueda

    2001-01-01

    El objetivo de esta investigación fue estudiar la relación entre la autonomía emocional respecto a los padres y el tipo de relaciones establecidas entre padres e hijos durante la adolescencia. También pretendíamos analizar las características socio-emocionales de aquellos chicos y chicas que manifiestan una alta autonomía emocional, así como el papel moderador jugado por el género y la calidad del contexto familiar sobre las relaciones entre la desvinculación afectiva y el desarro...

  13. Cárceles y mujeres en Galicia durante el franquismo

    OpenAIRE

    Martins Rodríguez, María Victoria

    2012-01-01

    Firstly, the situation of women in Galicia during the Franco dictatorship is analyzed. I think that that situation was really singular. Secondly, I study the type of women repression in Galicia, focusing on physical repression and prison, so I explain the kind of woman who suffered any of these types of repression. Finally, I describe the women’s prison space and living the conditions. En este trabajo analizamos primeramente la situación de la mujer en Galicia durante el franquismo a parti...

  14. Procesos y necesidades de desarrollo durante la infancia

    OpenAIRE

    Hidalgo García, María Victoria; Sánchez Hidalgo, José; Lorence Lara, Bárbara

    2009-01-01

    En este artículo se presenta un análisis de las necesidades de desarrollo durante la infancia. Cuando estas necesidades son cubiertas adecuadamente, niños y niñas experimentan un conjunto de progresos evolutivos que les conducen desde la dependencia inicial hasta una progresiva autonomía y participación activa en su grupo socio-cultural. Estos procesos de desarrollo serán expuestos de forma breve al hilo de las principales necesidades de dos etapas evolutivas: la etapa de la primera infancia ...

  15. Diario de un privilegiado durante el fascismo: Leo Ferrero

    Directory of Open Access Journals (Sweden)

    María Belén Hernández González

    2013-07-01

    Full Text Available La obra de Leo Ferrero, Diario de un privilegiado durante el fascismo, es un testimonio de la experiencia de la familia Ferrero Lombroso entre 1926 y 1927, obligada a la reclusión y aislamiento en su propia casa, por parte del régimen de Benito Mussolini. El texto anticipa en una década los escritos de la resistencia partisana. En este artículo se propone un panorama de la cultura en Italia en los años previos a la guerra, según la perspectiva crítica de Leo Ferrero.

  16. Multifractal Modelling of Mineralization

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    @@Mineralization refers to the physical process, which enhances the concentration of certain elements in rocks. The end products of the mineralization include both ore bodies which provide economically useable reservoir at the current industrial standard and altered rocks with elevated element concentration values below the minimum requirement for the current mining standard. The latter may be considered as resources potentially useful in the future. From this point of view, the mineral deposits are defined to be only an economic part of the total resources (a useable reservoir).

  17. Mineral resources of Antarctica

    Science.gov (United States)

    Compiled and edited by Wright, Nancy A.; Williams, Paul L.

    1974-01-01

    Although the existence of mineral deposits in Antarctica is highly probable, the chances of finding them are quite small. Minerals have been found there in great variety but only as occurrences. Manganese nodules, water (as ice), geothermal energy, coal, petroleum, and natural gas are potential resources that could perhaps be exploited in the future. On the basis of known mineral occurrences in Antarctica and relationships between geologic provinces of Antarctica and those of neighboring Gondwana continents, the best discovery probability for a base-metal deposit in any part of Antarctica is in the Andean orogen; it is estimated to be 0.075 (75 chances in 1,000).

  18. Multivitamin/Mineral Supplements

    Science.gov (United States)

    ... Online DRI Tool Daily Value (DV) Tables Consumer Datos en español Health Professional Other Resources Multivitamin/mineral ... Vitamin K lowers the drug's effectiveness and doctors base the medicine dose partly on the amount of ...

  19. sequenceMiner algorithm

    Data.gov (United States)

    National Aeronautics and Space Administration — Detecting and describing anomalies in large repositories of discrete symbol sequences. sequenceMiner has been open-sourced! Download the file below to try it out....

  20. Mineral Commodity Summaries 2009

    Science.gov (United States)

    ,

    2009-01-01

    Each chapter of the 2009 edition of the U.S. Geological Survey (USGS) Mineral Commodity Summaries (MCS) includes information on events, trends, and issues for each mineral commodity as well as discussions and tabular presentations on domestic industry structure, Government programs, tariffs, 5-year salient statistics, and world production and resources. The MCS is the earliest comprehensive source of 2008 mineral production data for the world. More than 90 individual minerals and materials are covered by two-page synopses. For mineral commodities for which there is a Government stockpile, detailed information concerning the stockpile status is included in the two-page synopsis. Because specific information concerning committed inventory was no longer available from the Defense Logistics Agency, National Defense Stockpile Center, that information, which was included in earlier Mineral Commodity Summaries publications, has been deleted from Mineral Commodity Summaries 2009. National reserves and reserve base information for most mineral commodities found in this report, including those for the United States, are derived from a variety of sources. The ideal source of such information would be comprehensive evaluations that apply the same criteria to deposits in different geographic areas and report the results by country. In the absence of such evaluations, national reserves and reserve base estimates compiled by countries for selected mineral commodities are a primary source of national reserves and reserve base information. Lacking national assessment information by governments, sources such as academic articles, company reports, common business practice, presentations by company representatives, and trade journal articles, or a combination of these, serve as the basis for national reserves and reserve base information reported in the mineral commodity sections of this publication. A national estimate may be assembled from the following: historically reported

  1. Law of radioactive minerals

    International Nuclear Information System (INIS)

    Legal device done in order to standardize and promote the exploration and explotation of radioactive minerals by peruvian and foreign investors. This device include the whole process, since the prospection until the development, after previous auction given by IPEN

  2. Coastal placer minerals

    Digital Repository Service at National Institute of Oceanography (India)

    Iyer, S.D.; Gujar, A.R.

    the minerals mandatory permissions from the various governmental and local bodies are needed to obtain a prospecting mining license. One of the simplest ways to recover the placer sand is by manual scooping but sophisticated machines are also used...

  3. Minerals in environmental technology

    Energy Technology Data Exchange (ETDEWEB)

    Schuiling, R.D. [Utrecht Univ., Utrecht (Netherlands). Faculty of Earth Sciences

    2000-07-01

    Minerals play a key role in the environment; this role is often not well understood, because the emphasis of most environmentalists is on air, water, or the composition of solid wastes as a whole, without paying attention to their mineralogical composition. Several minerals can serve as effective and cheap adsorbents for many toxic chemicals. Several minerals can be used as a cheap substitute for expensive chemicals in environmental technologies. Environmental technologies that produce an economically interesting mineral will have an edge over competing technologies. Most of the problems, overreaction, panicky and expensive measures with regard to exposure from quartz and asbestos stem from a poor understanding of natural levels of common contaminants, a disregard for mineralogy, and a lack of insight into natural processes in general.

  4. Fluorescent minerals, a review

    Science.gov (United States)

    Modreski, P.J.; Aumente-Modreski, R.

    1996-01-01

    Fluorescent minerals are more than just an attractive novelty, and collecting them is a speciality for thousands of individuals who appreciate their beauty, rarity, and scientific value. Fluorescent properties can be used as an aid to mineral identification, locality determination, and distinction between natural and synthetic gemstones. This article gives an overview of those aspects of fluorescence that are of most interest to collectors, hobbyists, and mineralogists. -from Authors

  5. Heavy mineral placers

    Digital Repository Service at National Institute of Oceanography (India)

    Gujar, A.R.

    , because of their high sp. gravity. Intrusive igneous rocks and metamorphic rocks are mostly the primary source for heavy placers (Table 3). Table 3. Important Placer Deposits of the world. Country Climatic zone Mineral Deposit Present Studies... minerals are of great value in studying 1. Provenance 2. Transport history of sediments 3. Weathering history of sediments and 4. In correlation and paleogeographic studies (Folk 1968). In addition to their use in solving academic and scientific...

  6. Clay Minerals: Adsorbophysical Properties

    International Nuclear Information System (INIS)

    The structure and features of surfaces of clay minerals (kaolin, montmorillonite, etc) have an important scientific and practical value. On the surface the interrelation of processes at electronic, atomic and molecular levels is realized. Availability of mineral surface to external influences opens wide scientific and technical opportunities of use of the surface phenomena, so the research of crystal-chemical and crystal-physical processes in near-surface area of clay minerals is important. After long term researches of gas-clay mineral system in physical fields the author has obtained experimental and theoretical material contributing to the creation of the surface theory of clays. A part of the researches is dedicated to studying the mechanism of crystal-chemical and crystal-physical processes in near surface area of clay mineral systems, selectivity of the surface centers to interact with gas phase molecules and adsorbophysical properties. The study of physical and chemical properties of fine clay minerals and their modification has a decisive importance for development of theory and practice of nanotechnologies: they are sorbents, membranes, ceramics and other materials with required electronic features

  7. Mineral commodity summaries 2013

    Science.gov (United States)

    U.S. Geological Survey

    2013-01-01

    Each chapter of the 2013 edition of the U.S. Geological Survey (USGS) Mineral Commodity Summaries (MCS) includes information on events, trends, and issues for each mineral commodity as well as discussions and tabular presentations on domestic industry structure, Government programs, tariffs, 5-year salient statistics, and world production and resources. The MCS is the earliest comprehensive source of 2012 mineral production data for the world. More than 90 individual minerals and materials are covered by two-page synopses. For mineral commodities for which there is a Government stockpile, detailed information concerning the stockpile status is included in the two-page synopsis. Abbreviations and units of measure, and definitions of selected terms used in the report, are in Appendix A and Appendix B, respectively. “Appendix C—Reserves and Resources” includes “Part A—Resource/Reserve Classification for Minerals” and “Part B—Sources of Reserves Data.” A directory of USGS minerals information country specialists and their responsibilities is Appendix D. The USGS continually strives to improve the value of its publications to users. Constructive comments and suggestions by readers of the MCS 2013 are welcomed.

  8. Mineral commodity summaries 2014

    Science.gov (United States)

    U.S. Geological Survey

    2014-01-01

    Each chapter of the 2014 edition of the U.S. Geological Survey (USGS) Mineral Commodity Summaries (MCS) includes information on events, trends, and issues for each mineral commodity as well as discussions and tabular presentations on domestic industry structure, Government programs, tariffs, 5-year salient statistics, and world production and resources. The MCS is the earliest comprehensive source of 2013 mineral production data for the world. More than 90 individual minerals and materials are covered by two-page synopses. For mineral commodities for which there is a Government stockpile, detailed information concerning the stockpile status is included in the two-page synopsis. Abbreviations and units of measure, and definitions of selected terms used in the report, are in Appendix A and Appendix B, respectively. “Appendix C—Reserves and Resources” includes “Part A—Resource/Reserve Classification for Minerals” and “Part B—Sources of Reserves Data.” A directory of USGS minerals information country specialists and their responsibilities is Appendix D. The USGS continually strives to improve the value of its publications to users. Constructive comments and suggestions by readers of the MCS 2014 are welcomed.

  9. El autoconcepto físico durante el ciclo vital

    OpenAIRE

    Esnaola Etxaniz, Igor

    2008-01-01

    El objetivo de esta investigación ha sido analizar el autoconcepto físico durante el ciclo vital. La muestra está compuesta por 1.259 participantes divididos en cuatro tramos de edad: adolescencia (12-18 años), juventud (19-30 años), edad adulta (31-49 años) y personas mayores de 55 años. Tanto en la muestra de mujeres como en la de varones, los resultados indican que las percepciones en las escalas de habilidad física y condición física van disminuyendo desde la adolescencia hasta las person...

  10. en Pontevedra durante el año 2001

    Directory of Open Access Journals (Sweden)

    P. Fernández

    2005-01-01

    Full Text Available Se presenta un estudio epidemiológico de las intoxicaciones agudas por psicofármacos y drogas de abuso (excluyendo el alcohol, atendidas en el Servicio de Urgencias de adultos del Complejo Hospitalario de Pontevedra (CHOP durante el año 2001. Utilizando el test cualitativo de screening de drogas de abuso Triage TM8 (Biosite Diagnostics, se analizaron 554 orinas, de las cuales 318 resultaron positivas, lo que supone un 0,56% del total de urgencias atendidas en este Centro durante este año. Se observa un claro predominio de las intoxicaciones por psicofármacos (208 casos, seguidos de la cocaína (56 casos, marihuana (28 casos, opiáceos (16 casos y anfetaminas (10 casos. El 55% de los pacientes eran varones, con una edad media de 32,1 años. Entre los antecedentes registrados destaca la drogadicción (78 casos, el tratamiento previo con psicofármacos (60 casos y los antecedentes psiquiátricos (43 casos. Los síntomas neurológicos, en especial los derivados del deterioro del nivel de conciencia, fueron los más frecuentes (37%, relacionados mayoritariamente con el consumo de psicofármacos. El tratamiento más aplicado fue el inespecífico (54% y, aunque casi un 45% precisó ingreso hospitalario, su baja letalidad (<1% confirma el carácter banal y la evolución satisfactoria de la mayoría de los pacientes.

  11. MANIFESTACIONES OCULTAS DE VIOLENCIA, DURANTE EL DESARROLLO DEL RECREO ESCOLAR

    Directory of Open Access Journals (Sweden)

    Jenny María Artavia Granados

    2013-01-01

    Full Text Available El presente artículo es producto de un proceso de investigación realizado en una escuela de la Dirección Regional de Educación de Occidente, en Costa Rica. Este tiene como fin determinar si durante el desarrollo de los recreos se suscitan manifestaciones de violencia implícitas u ocultas entre las y los estudiantes II Ciclo de la Educación General Básica. En el proceso del estudio se tomaron en cuenta aspectos relacionados con las actividades lúdicas y las interacciones personales desarrolladas durante los recreos escolares y que podrían propiciar violencia escolar implícita u oculta. Se procuró identificar la existencia de enfrentamientos y conflictos entre estudiantes, que conllevan amenazas, manifestaciones de exclusión, persecuciones e intimidaciones entre las y los niños. Se plantearon algunas conclusiones entre las que destacan que un alto porcentaje de la población estudiantil investigada manifiesta recibir amenazas, y que estas, en mayor número, se producen entre las niñas. Asimismo, un alto porcentaje de esta población estudiada indica que ha sido excluida en la dinámica del recreo por diferentes motivos, entre los que destacan: características físicas, género, condición social y situaciones particulares educativas que presentan algunos niños o niñas en edad escolar.

  12. The mineral economy of Brazil--Economia mineral do Brasil

    Science.gov (United States)

    Gurmendi, Alfredo C.; Barboza, Frederico Lopes; Thorman, Charles H.

    1999-01-01

    This study depicts the Brazilian government structure, mineral legislation and investment policy, taxation, foreign investment policies, environmental laws and regulations, and conditions in which the mineral industry operates. The report underlines Brazil's large and diversified mineral endowment. A total of 37 mineral commodities, or groups of closely related commodities, is discussed. An overview of the geologic setting of the major mineral deposits is presented. This report is presented in English and Portuguese in pdf format.

  13. Measuring the Hardness of Minerals

    Science.gov (United States)

    Bushby, Jessica

    2005-01-01

    The author discusses Moh's hardness scale, a comparative scale for minerals, whereby the softest mineral (talc) is placed at 1 and the hardest mineral (diamond) is placed at 10, with all other minerals ordered in between, according to their hardness. Development history of the scale is outlined, as well as a description of how the scale is used…

  14. Extraterrestrial magnetic minerals

    Science.gov (United States)

    Pechersky, D. M.; Markov, G. P.; Tsel'movich, V. A.; Sharonova, Z. V.

    2012-07-01

    Thermomagnetic and microprobe analyses are carried out and a set of magnetic characteristics are measured for 25 meteorites and 3 tektites from the collections of the Vernadsky Geological Museum of the Russian Academy of Sciences and Museum of Natural History of the North-East Interdisciplinary Science Research Institute, Far Eastern Branch of the Russian Academy of Sciences. It is found that, notwithstanding their type, all the meteorites contain the same magnetic minerals and only differ by concentrations of these minerals. Kamacite with less than 10% nickel is the main magnetic mineral in the studied samples. Pure iron, taenite, and schreibersite are less frequent; nickel, various iron spinels, Fe-Al alloys, etc., are very rare. These minerals are normally absent in the crusts of the Earth and other planets. The studied meteorites are more likely parts of the cores and lower mantles of the meteoritic parent bodies (the planets). Uniformity in the magnetic properties of the meteorites and the types of their thermomagnetic (MT) curves is violated by secondary alterations of the meteorites in the terrestrial environment. The sediments demonstrate the same monotony as the meteorites: kamacite is likely the only extraterrestrial magnetic mineral, which is abundant in sediments and associated with cosmic dust. The compositional similarity of kamacite in iron meteorites and in cosmic dust is due to their common source; the degree of fragmentation of the material of the parent body is the only difference.

  15. 43 CFR 19.8 - Prospecting, mineral locations, mineral patents, and mineral leasing within National Forest...

    Science.gov (United States)

    2010-10-01

    .... 2 of 43 CFR, which appears in Volume II of the List of CFR Sections Affected, 1964-1972, for the... patents, and mineral leasing within National Forest Wilderness. 19.8 Section 19.8 Public Lands: Interior... § 19.8 Prospecting, mineral locations, mineral patents, and mineral leasing within National...

  16. Microbially mediated mineral carbonation

    Science.gov (United States)

    Power, I. M.; Wilson, S. A.; Dipple, G. M.; Southam, G.

    2010-12-01

    Mineral carbonation involves silicate dissolution and carbonate precipitation, which are both natural processes that microorganisms are able to mediate in near surface environments (Ferris et al., 1994; Eq. 1). (Ca,Mg)SiO3 + 2H2CO3 + H2O → (Ca,Mg)CO3 + H2O + H4SiO4 + O2 (1) Cyanobacteria are photoautotrophs with cell surface characteristics and metabolic processes involving inorganic carbon that can induce carbonate precipitation. This occurs partly by concentrating cations within their net-negative cell envelope and through the alkalinization of their microenvironment (Thompson & Ferris, 1990). Regions with mafic and ultramafic bedrock, such as near Atlin, British Columbia, Canada, represent the best potential sources of feedstocks for mineral carbonation. The hydromagnesite playas near Atlin are a natural biogeochemical model for the carbonation of magnesium silicate minerals (Power et al., 2009). Field-based studies at Atlin and corroborating laboratory experiments demonstrate the ability of a microbial consortium dominated by filamentous cyanobacteria to induce the precipitation of carbonate minerals. Phototrophic microbes, such as cyanobacteria, have been proposed as a means for producing biodiesel and other value added products because of their efficiency as solar collectors and low requirement for valuable, cultivable land in comparison to crops (Dismukes et al., 2008). Carbonate precipitation and biomass production could be facilitated using specifically designed ponds to collect waters rich in dissolved cations (e.g., Mg2+ and Ca2+), which would allow for evapoconcentration and provide an appropriate environment for growth of cyanobacteria. Microbially mediated carbonate precipitation does not require large quantities of energy or chemicals needed for industrial systems that have been proposed for rapid carbon capture and storage via mineral carbonation (e.g., Lackner et al., 1995). Therefore, this biogeochemical approach may represent a readily

  17. Manifestaciones ocultas de violencia, durante el desarrollo del recreo escolar

    Directory of Open Access Journals (Sweden)

    Artavia Granados, Jenny María

    2013-01-01

    Full Text Available El presente artículo es producto de un proceso de investigación realizado en una escuela de la Dirección Regional de Educación de Occidente, en Costa Rica. Este tiene como fin determinar si durante el desarrollo de los recreos se suscitan manifestaciones de violencia implícitas u ocultas entre las y los estudiantes II Ciclo de la Educación General Básica. En el proceso del estudio se tomaron en cuenta aspectos relacionados con las actividades lúdicas y las interacciones personales desarrolladas durante los recreos escolares y que podrían propiciar violencia escolar implícita u oculta. Se procuró identificar la existencia de enfrentamientos y conflictos entre estudiantes, que conllevan amenazas, manifestaciones de exclusión, persecuciones e intimidaciones entre las y los niños. Se plantearon algunas conclusiones entre las que destacan que un alto porcentaje de la población estudiantil investigada manifiesta recibir amenazas, y que estas, en mayor número, se producen entre las niñas. Asimismo, un alto porcentaje de esta población estudiada indica que ha sido excluida en la dinámica del recreo por diferentes motivos, entre los que destacan: características físicas, género, condición social y situaciones particulares educativas que presentan algunos niños o niñas en edad escolar.This article is the product of a research process carried out in a school at Dirección Regional de Occidente (Western Regional Bureau of Education, in Costa Rica. This is intended to determine if during the development of school recesses manifestations of violence, implied or hidden, arise among the students of II Cycle of the General Basic Education. The process of the study took into account aspects related to recreational activities and personal interactions developed in school recess and that could lead to implied or hidden school violence or bullying. It was aimed to identify the existence of confrontations and conflicts between students

  18. Clay Mineral: Radiological Characterization

    Science.gov (United States)

    Cotomácio, J. G.; Silva, P. S. C.; Mazzilli, B. P.

    2008-08-01

    Since the early days, clays have been used for therapeutic purposes. Nowadays, most minerals applied as anti-inflammatory, pharmaceutics and cosmetic are the clay minerals that are used as the active ingredient or, as the excipient, in formulations. Although their large use, few information is available in literature on the content of the radionuclide concentrations of uranium and thorium natural series and 40K in these clay minerals. The objective of this work is to determine the concentrations of 238U, 232Th, 226Ra, 228Ra, 210Pb and 40K in commercial samples of clay minerals used for pharmaceutical or cosmetic purposes. Two kinds of clays samples were obtained in pharmacies, named green clay and white clay. Measurement for the determination of 238U and 232Th activity concentration was made by alpha spectrometry and gamma spectrometry was used for 226Ra, 228Ra, 210Pb and 40K determination. Some physical-chemical parameters were also determined as organic carbon and pH. The average activity concentration obtained was 906±340 Bq kg-1 for 40K, 40±9 Bq kg-1 for 226Ra, 75±9 Bq kg-1 for 228Ra, 197±38 Bq kg-1 for 210Pb, 51±26 Bq kg-1 for 238U and 55±24 Bq kg-1 for 232Th, considering both kinds of clay.

  19. Marine Mineral Exploration

    DEFF Research Database (Denmark)

    The past 20 years have seen extensive marine exploration work by the major industrialized countries. Studies have, in part, been concentrated on Pacific manganese nodule occurrences and on massive sulfides on mid-oceanic ridges. An international jurisdictional framework of the sea-bed mineral...

  20. Uruguay minerals fuels

    International Nuclear Information System (INIS)

    In this report the bases for the development of the necessary works of prospection are exposed on mineral fuels of Uruguay. We have taken the set from: coal, lutitas bituminous, uranium, petroleum and disturbs. In all the cases we have talked about to the present state of the knowledge and to the works that we considered necessary to develop in each case

  1. Mineralization of fossil wood

    NARCIS (Netherlands)

    Buurman, P.

    1972-01-01

    Several pieces of fossil wood have been analyzed with X-ray diffraction and were grouped on the basis of mineralogical composition. Various mineralizations were studied in thin sections and by means of the scanning electron microscope. Wood-opals appear to show a structure preservation that points t

  2. Actividad Sísmica en Costa Rica Durante el 2013

    Directory of Open Access Journals (Sweden)

    Lepolt Linkimer

    2014-12-01

    Full Text Available Durante el 2013 la Red Sismológica Nacional (RSN: UCR-ICE localizó 2547 sismos de los cuales 261 fueron sentidos por la población. Se percibieron en Costa Rica siete sismos con magnitud Mw ≥ 5,0. La mayoría (85% de los sismos percibidos fueron superficiales (< 30 km y el 56% tuvo una magnitud baja (Mw 3,0-3,9. El fallamiento local y regional provocó el 52% de los sismos, seguido por el proceso de subducción de la placa del Coco bajo la placa Caribe y la microplaca de Panamá que originó el 45%. La intensidad máxima observada en el 2013 fue de VI (Mercalli Modificada, MM para la zona de Sixaola (Limón debido al sismo del 27 de mayo (Mw 5,6 con epicentro en el occidente de Panamá.

  3. Reformismo e intervencionismo militar durante la Guerra Civil

    Directory of Open Access Journals (Sweden)

    Ramón SALAS LARRAZÁBAL

    2010-02-01

    Full Text Available El reformismo militar ha sido durante nuestra historia contemporánea una obsesión que cayó en manía, tal vez porque nunca se hizo una verdadera reforma y el intervencionismo de los militares en la política, un hábito que llegó a adquirir caracteres patológicos endémicos. Del centenar largo de españoles que ocuparon una o varias veces la cartera de la guerra desde la convocatoria de Cortes en 1.809 hasta nuestra Guerra Civil, raro fue el que no llevaba en sus bolsillos al incorporarse a su puesto un proyecto de reforma militar y lo mismo podría decirse de los que en número sensiblemente igual se sucedieron en el Ministerio de Marina, todos los cuales eran portadores de su personal programa naval. Del mismo modo también puede afirmarse que en casi todas las situaciones en que, con éxito o sin él, se produjo un cambio sustancial en el funcionamiento de las Instituciones, los que lo protagonizaron o eran militares o buscaron y encontraron apoyo en las Fuerzas Armadas.

  4. Síndrome de Brugada durante el embarazo

    Directory of Open Access Journals (Sweden)

    Eduardo Reyna Villasmil

    2013-09-01

    Full Text Available El síndrome de Brugada es una causa común de muerte súbita de origen cardiaco. Los cambios electrocardiográficos característicos del síndrome están relacionados con las alteraciones de los canales de sodio. Las características clínicas y moleculares del síndrome han progresado rápidamente desde la descripción inicial. Existen escasos reportes de esta enfermedad en el embarazo. Se describe un caso de síndrome de Brugada durante el embarazo en una mujer joven que se presentó con síncope y taquicardia ventricular. Brugada syndrome during pregnancy Brugada syndrome is a common cause of cardiac-origin sudden death. The characteristic electrocardiographic changes of the syndrome are linked to sodium channel alterations. Clinical and molecular characterization of the syndrome has progressed rapidly since its initial description. There are few reports of this disease in pregnancy. We describe a case of revelation of Brugada syndrome during pregnancy in a young woman who presented syncope and ventricular tachycardia.

  5. Aggregate and Mineral Resources - Industrial Mineral Mining Operations

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — An Industrial Mineral Mining Operation is a DEP primary facility type related to the Industrial Mineral Mining Program. The sub-facility types are listed below:Deep...

  6. Carbon Mineral Ecology: Predicting the Undiscovered Minerals of Carbon

    Science.gov (United States)

    Hazen, R. M.; Hummer, D. R.; Downs, R. T.; Hystad, G.; Golden, J.

    2015-12-01

    The diversity and distribution of Earth's minerals through deep time reflects key events in our planet's crustal evolution. Studies in mineral ecology exploit mineralogical databases to document diversity-distribution relationships of minerals, which reveal that all carbon-bearing minerals, as well as subsets containing C with O, H, Ca, or Na, conform to Large Number of Rare Events (LNRE) distributions. LNRE models facilitate prediction of total mineral diversity, and thus point to minerals that exist on Earth but have not yet been discovered and described. Our model predicts that at least 548 C minerals exist on Earth today, indicating that at least 145 carbon-bearing mineral species have yet to be discovered. Furthermore, by analyzing subsets of the most common additional elements in carbon-bearing minerals (i.e., 378 C + O species; 282 C + H species; 133 C + Ca species; and 100 C + Na species), we predict that 129 of these missing carbon minerals contain oxygen, 118 contain hydrogen, 52 contain calcium, and more than 60 contain sodium. The majority of these as yet undescribed minerals are predicted to be hydrous carbonates, many of which may have been overlooked because they are colorless, poorly crystalized, and/or water-soluble. We propose the identities of plausible as yet undescribed carbon minerals, as well as search strategies for their discovery. Some of these minerals will be natural examples of known synthetic compounds, including carbides such as calcium carbide (CaC2), crystalline hydrocarbons such as pyrene (C16H10), and numerous oxalates, anhydrous carbonates, and hydrous carbonates. Many other missing carbon minerals will be isomorphs of known carbon minerals, notably of the more than 100 different hydrous carbonate structures. An understanding of Earth's "missing" minerals provides a more complete picture of geochemical processes that influence crustal evolution.

  7. Construction Minerals Operations - Direct Download

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This map layer includes construction minerals operations in the United States. The data represent commodities covered by the Minerals Information Team (MIT) of the...

  8. Agricultural Minerals Operations - Direct Download

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This map layer includes agricultural minerals operations in the United States. The data represent commodities covered by the Minerals Information Team (MIT) of the...

  9. Rock and mineral magnetism

    CERN Document Server

    O’Reilly, W

    1984-01-01

    The past two decades have witnessed a revolution in the earth sciences. The quantitative, instrument-based measurements and physical models of. geophysics, together with advances in technology, have radically transformed the way in which the Earth, and especially its crust, is described. The study of the magnetism of the rocks of the Earth's crust has played a major part in this transformation. Rocks, or more specifically their constituent magnetic minerals, can be regarded as a measuring instrument provided by nature, which can be employed in the service of the earth sciences. Thus magnetic minerals are a recording magnetometer; a goniometer or protractor, recording the directions of flows, fields and forces; a clock; a recording thermometer; a position recorder; astrain gauge; an instrument for geo­ logical surveying; a tracer in climatology and hydrology; a tool in petrology. No instrument is linear, or free from noise and systematic errors, and the performance of nature's instrument must be assessed and ...

  10. Aggregates from mineral wastes

    Directory of Open Access Journals (Sweden)

    Baic Ireneusz

    2016-01-01

    Full Text Available The problem concerning the growing demand for natural aggregates and the need to limit costs, including transportation from remote deposits, cause the increase in growth of interest in aggregates from mineral wastes as well as in technologies of their production and recovery. The paper presents the issue related to the group of aggregates other than natural. A common name is proposed for such material: “alternative aggregates”. The name seems to be fully justified due to adequacy of this term because of this raw materials origin and role, in comparison to the meaning of natural aggregates based on gravel and sand as well as crushed stones. The paper presents characteristics of the market and basic application of aggregates produced from mineral wastes, generated in the mining, power and metallurgical industries as well as material from demolished objects.

  11. Discussion on Nontraditional Mineral Resources

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    In this paper, the authors introduce the concept of nontraditional mineral resources, and pro pose the major system of nontraditional mineral resources, including nontraditional resources, research methods, mining and mineral economics. Then the authors conclude that the research on nontraditional mineral resources is not only significant to satisfication the human needs in the 21st century, but also important to the development of the present geological theory.

  12. Paleogeografía de América del Sur durante el Jurásico

    Directory of Open Access Journals (Sweden)

    María Paula Iglesia Llanos

    2008-12-01

    Full Text Available El presente estudio fue efectuado en cuatro secciones del Jurásico Temprano marino de las provincias de Mendoza y Neuquén, compuestas mayormente por rocas sedimentarias de grano fino portadoras de amonites y volcanitas intercaladas. Se aislaron dos componentes magnéticas portadas por titanomagnetitas y en forma subordinada, por otro mineral de alta coercitividad/temperatura de bloqueo (titanohematita?. La componente A, que es la más blanda, se interpreta como una remagnetización relativamente reciente, en tanto la componente B correspondería a la magnetización original adquirida durante o poco después de la depositación de los sedimentos y el enfriamiento de las volcanitas en el Jurásico Temprano, de acuerdo a las diversas pruebas de campo de estabilidad paleomagnética y estudios ópticos. Sobre la base de estos datos, se obtuvieron dos nuevos polos paleomagnéticos, uno para el Hetangiano-Sinemuriano (223°E, 51°S, A95= 6°, N = 25 y otro para el Pliensbaquiano-Toarciano (67°E, 74°S, A95= 5°, N = 52. Los mismos fueron utilizados con otros paleopolos del continente cuidadosamente seleccionados para construir una curva de deriva polar aparente para el intervalo Triásico Tardío-Jurásico Tardío, la cual resulta completamente diferente a las que se proponen en la literatura. En particular, se destaca la presencia de un codo en el tramo Jurásico Temprano que refleja importantes desplazamientos latitudinales de América del Sur y que se halla asimismo en otros continentes de Pangea. Así, los datos obtenidos indican que América del Sur se localizaba durante el lapso Triásico Tardío- Sinemuriano en latitudes más australes que la actual en tanto en el Pliensbaquiano se encontraba por el contrario, en su posición más septentrional. A finales del Jurásico Temprano el continente se desplazó nuevamente al sur hasta ubicarse durante el Jurásico Medio en latitudes semejantes a las actuales. Estos cambios latitudinales est

  13. Refractory Minerals in Henan Province

    Institute of Scientific and Technical Information of China (English)

    JIN Qinguo; LI Jing; LIU Jiehua; LIU Yanjun

    2004-01-01

    Henan province is very rich in refractory minerals of many varieties including silica, dolomite, graphite,pearlite, sepiolite, olivine, and sillimanite group minerals, besides the abundant reserves of fireclay and bauxite,which lay a good foundation for the development of the refractories industry of the province. The paper introduces the reserves, distribution and character of the refractory minerals in Henan province.

  14. Taux de la procalcitonine durant la grossesse, l'accouchement et le post-partum

    OpenAIRE

    Paccolat, Céline

    2013-01-01

    Les complications infectieuses durant la grossesse constituent le problème médical le plus fréquemment rencontré chez la femme enceinte. Il est actuellement bien démontré que les marqueurs couramment utilisés dans le diagnostic des infections, tels que la leucocytose et la protéine C réactive (CRP), doivent être utilisés prudemment durant la grossesse, en raison de la modification physiologique de leurs valeurs de normalité durant cette période. La procalcitonine (PCT) est, depuis plusieurs a...

  15. Water, mineral waters and health.

    Science.gov (United States)

    Petraccia, Luisa; Liberati, Giovanna; Masciullo, Stefano Giuseppe; Grassi, Marcello; Fraioli, Antonio

    2006-06-01

    The authors focus on water resources and the use of mineral waters in human nutrition, especially in the different stages of life, in physical activity and in the presence of some morbid conditions. Mineral water is characterized by its purity at source, its content in minerals, trace elements and other constituents, its conservation and its healing properties recognized by the Ministry of Health after clinical and pharmacological trials. Based on total salt content in grams after evaporation of 1l mineral water dried at 180 degrees C (dry residues), mineral waters can be classified as: waters with a very low mineral content, waters low in mineral content, waters with a medium mineral content, and strongly mineralized waters. Based on ion composition mineral waters can be classified as: bicarbonate waters, sulfate waters, sodium chloride or saltwater, sulfuric waters. Based on biological activity mineral waters can be classified as: diuretic waters, cathartic waters, waters with antiphlogistic properties. Instructions for use, doses, and current regulations are included.

  16. Información sobre las actividades en REDZOOT durante enero/2008‏

    Directory of Open Access Journals (Sweden)

    Veterinaria.org

    2008-02-01

    Full Text Available ResumenInformamos que durante el pasado mes de enero la lista interna de REDZOOT, Red Latina de Revistas de Zootecnia, de la que REDVET es miembro fundador, está teniendo una intensa actividad.

  17. Emissions monitoring in conveyed gas flow: (a) sulfur oxides and nitrogen oxides expressed respectively as SO{sub 2} and NO{sub 2}, (b) inorganic chlorine and fluorine compounds as gases and vapours expressed as HCl and HF; Rilevamento delle emissioni in flussi gassosi convogliati: (a) ossidid di zolfo e ossidi di azoto espressi rispettivamente come SO{sub 2} e NO{sub 2}, (b) composti inorganici del cloro e del fluoro sotto forma di gas e vapore espressi rispettivamente come HCl e HF

    Energy Technology Data Exchange (ETDEWEB)

    Ziemacki, G.; Viviano, G. [ed.] [Isituto Superiore di Sanita`, Rome (Italy). Gruppo di lavoro `Modifiche per il rilevamento delle emissioni in atmosfera da impianti industriali`

    1998-03-01

    The method (a) enables the determination of sulfur oxides (SO{sub 2}) and nitrogen oxides (NO{sub 2}) in conveyed atmospheric emissions. A stream of flue gas is a sampled by a heated with a filter housing and absorbed by an alkaline solution of potassium permanganate. The absorption solution is analyzed by ion-exchange chromatography for the determination of sulfate ion and nitrate ion as SO{sub 2} and NO{sub 2}. The method (b) enables the determination of hydrochloric acid (HCl) and hydrofluoric acid (HF) in conveyed atmospheric emissions. A stream of flue gas is sampled by a heated probe with a filter housing and absorbed by an alkaline solution (NaOH). The absorption solution is analyzed by ion-exchange chromatography for the determination of chloride ion and fluoride ion as HCl and HF. [Italiano] Il metodo a) consente la determinazione, in emissioni atmosferiche convogliate, degli ossidi di zolfo (SO{sub 2}) e degli ossidi di azoto (NO{sub 2}). Il campionamento viene effettuato mediante sonda riscaldata, munita di sistema filtrante, e sistema di assorbimento in soluzione alcalina di permanganato di potassio. La soluzione di assorbimento viene analizzata mediante cromatografia a scambio ionico, determinando le concentrazioni di ioni solfato e nitrato come SO{sub 2} ed NO{sub 2}. Il metodo b) consente la determinazione, in emissioni atmosferiche convogliate, dell`acido cloridrico (HCl) e dell`acido fluoridrico (HF). Il campionamento viene effettuato mediante sonda riscaldata, munita di sistema filtrante, e sistema di assorbimento in soluzione alcalina (NaOH). La soluzione alcalina viene quindi analizzata mediante cromatografia a scambio ionico, deter,mminando le concentrazioni di ioni cloro e fluoro come HCl e HF.

  18. Surface miner MTS 1250

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, D. [MAN TAKRAF Foerdertechnik GmbH, Leipzig (Germany)

    1999-03-01

    The Surface Miner MTS 1250 has been developed and tested by MAN TAKRAF with technical support from MIBRAG mbH. Its technology is based on a detailed analysis of all machines on the market and constitutes an optimum combination of their advantages. The unit can either be driven by a diesel-hydraulic drive for truck operation or by an electro-mechanical/electro-hydraulic drive for beltwagon and belt conveyor operation. The new equipment design is particularly suitable for mining deposits of difficult configuration. For specific requirements, MAN TAKRAF offers tailor-made solutions with smaller or greater throughputs and with enhanced specific cutting strength. (orig.) [Deutsch] Die Surface Miner MTS 1250 wurde von MAN TAKRAF mit fachlicher Unterstuetzung der MIBRAG entwickelt und erprobt. Seine Technik basiert auf einer detaillierten Analyse aller am Markt befindlichen Geraete und kombiniert deren Vorteile optimal. Mit diesel-hydraulischem Antrieb wird er in Verbindung mit Trucks eingesetzt. Mit elektro-mechanischem/elektro-hydraulischem Antrieb wird er in Kombination mit einem Spezialbrandwagen und einer Bandanlage eingesetzt. Das neue Geraetekonzept ist fuer den Abbau von schwierigen Lagerstaetten sehr gut geeignet. Selbstverstaendlich werden entsprechend den Einsatzanforderungen auch Geraete mit kleinerer oder groesserer Durchsatzleistung und mit hoeherer spezifischer Schneidleistung von MAN TAKRAF angeboten (orig.)

  19. QUALIDADE DE LARANJA HAMLIN DURANTE ARMAZENAMENTO EM DIFERENTES TEMPERATURAS

    Directory of Open Access Journals (Sweden)

    BRUNINI, Maria Amalia

    2013-10-01

    Full Text Available The aim of this work was to evaluate the quality and shelf life of Hamlin orange fruits, packed or not, into polystyrene expanded trays covered with stretching and sticking PVC plastic film, with thickness of 14 µm, during stored at 7 ± 1ºC, with 80-85% RU, 11±1ºC with 90-95% RU, and 24 to 28ºC with 48-70% RU. The orange fruits were evaluated through weight loss, respiration rate, shape, color (L value, Hue and Chroma, firmness, juice yield, titrable acidity, pH, soluble solid, ratio, vitamin C and technology Index. Through the obtained results it is observed that the low temperature storage, associated with packing, reduced the fresh mass loss; the use of the packaging, independent of the storage temperature, may be increase the shelf life with maintenance quality and reduced of the weight loss; the orange fruits packed and stored at 7 ± 1ºC and at 24 to 28ºC had shelf life of 28 days, while the stored orange fruits at 11±1ºC had shelf life of 21 days; the f vitamin C content decreased with the storage time, independent of the treatment. O objetivo deste trabalho foi avaliar o efeito de temperaturas de armazenamento, associadas ou não a embalagens na qualidade e vida útil de laranjas Hamlin, acondicionadas ou não, em bandejas de poliestireno expandido revestidas externamente com filme plástico de PVC esticável e auto aderente de 14µ, durante armazenamento a7 ± 1ºC, com 80-85% UR; a 11±1ºC, com 90-95% UR e à temperatura de 24 a 28ºC, com 48-70% UR. Os parâmetros avaliados foram perda de massa fresca, respiração, índice de formato, coloração (valor de L, Hue e Chroma, resistência, rendimento em suco, acidez titulável, pH, sólidos solúveis, índice de maturação, vitamina C e índice tecnológico. Considerando os resultados aqui obtidos pode-se concluir que o armazenamento sob baixa temperatura, associada a embalagem, reduziu a perda de massa fresca; o uso de embalagem, independente da temperatura de armazenamento

  20. La literatura médica española sobre los riesgos del amianto durante el franquismo

    Directory of Open Access Journals (Sweden)

    Menéndez-Navarro, Alfredo

    2012-06-01

    Full Text Available Asbestos is a fibrous mineral used since the early 20th century in a wide range of manufacturing processes and industrial products for its fireproofing and abrasion-resistant properties. Asbestos exposure has had harmful effects on the health of workers and of the general population. Asbestos risks have attracted scant historiographical attention in Spain, contributing to the idea of a lack of medical and public concerns about this issue until the 1980s. The aim of this paper was to analyze the emergence of such concerns during the Franco regime by exploring the medical literature and the legislation drafted to address asbestos hazards.

    El amianto o asbesto es un mineral fibroso de propiedades ignífugas y resistente a la abrasión que ha sido empleado masivamente en procesos industriales y productos manufacturados desde comienzos del siglo XX. Su uso ha provocado graves problemas de salud en los trabajadores expuestos y en la población general. La atención historiográfica a los riesgos del amianto en España ha sido casi inexistente, lo que ha contribuido a consolidar la idea de una ausencia de preocupación por este problema en nuestro país hasta la década de los ochenta. El objetivo de este trabajo es analizar el surgimiento de dicha preocupación durante el periodo franquista, mediante un análisis de la producción científica y de la normativa aprobada para enfrentar los riesgos del amianto.

  1. Spectroscopic characterization of manganese minerals

    Science.gov (United States)

    Lakshmi Reddy, S.; Padma Suvarna, K.; Udayabhaska Reddy, G.; Endo, Tamio; Frost, R. L.

    2014-01-01

    Manganese minerals ardenite, alleghanyite and leucopoenicite originated from Madhya Pradesh, India, Nagano prefecture Japan, Sussex Country and Parker Shaft Franklin, Sussex Country, New Jersey respectively are used in the present work. In these minerals manganese is the major constituent and iron if present is in traces only. An EPR study of on all of the above samples confirms the presence of Mn(II) with g around 2.0. Optical absorption spectrum of the mineral alleghanyite indicates that Mn(II) is present in two different octahedral sites and in leucophoenicite Mn(II) is also in octahedral geometry. Ardenite mineral gives only a few Mn(II) bands. NIR results of the minerals ardenite, leucophoenicite and alleghanyite are due to hydroxyl and silicate anions which confirming the formulae of the minerals.

  2. Radioactivity of phosphate mineral products

    OpenAIRE

    Mitrović Branislava; Vitorović Gordana; Stojanović Mirjana; Vitorović Duško

    2011-01-01

    The phosphate industry is one of the biggest polluters of the environment with uranium. Different products are derived after processing phosphoric ore, such as mineral and phosphate fertilizers and phosphate mineral supplements (dicalcium-and monocalcium phosphate) for animal feeding. Phosphate mineral additives used in animal food may contain a high activity of uranium. Research in this study should provide an answer to the extent in which phosphate minera...

  3. Is Struvite a Prebiotic Mineral?

    OpenAIRE

    Matthew A. Pasek; Maheen Gull

    2013-01-01

    The prebiotic relevance of mineral struvite, MgNH4PO4·6H2O, was studied experimentally as a phosphorylating reagent and, theoretically, to understand the geochemical requirements for its formation. The effectiveness of phosphorylation by the phosphate mineral, monetite, CaHPO4, was also studied to compare to the efficiency of struvite. The experiments focused on the phosphorylation reactions of the minerals with organic compounds, such as nucleosides, glycerol and choline chloride, and heat a...

  4. Mineral fibres and health

    International Nuclear Information System (INIS)

    The use of inorganic fibrous materials is a comparatively new phenomenon and was uncommon before the Industrial Revolution. Humans evolved in a comparatively fibre-free environment and consequently never fully developed the defence mechanisms needed to deal with the consequences of inhaling fibres. However, the urban environment now has an airborne fibre concentration of around 1 f.l-1, which is a tenfold increase on the natural background. Any sample of ambient air collected indoors or outdoors will probably contain some mineral fibres, but there is little evidence that these pose any risk to human health. They come from asbestos used in brakes, glass and mineral wools used as insulation and fire proofing of buildings, gypsum from plaster and a variety of types from many sources. Few of these have the potential to do any harm. Asbestos is the only fibre of note but urban levels are insignificant compared to occupational exposures. When the health of cohorts occupationally exposed to the several types of asbestos is studied the problem can be put into perspective. Studies of workers in the chrysotile industry exposed to much higher dust levels than in a factory today show no excess lung cancer or mesothelioma. By comparison those living near crocidolite mines, let alone working in them, may develop asbestos-related disease. As always, dose is the critical factor. Chrysotile is cleared from the lungs very efficiently, only the amphiboles are well retained. The only real health problem comes from the earlier use of asbestos products that may now be old, friable and damaged and made from amphibole or mixed fibre. If though, these are still in good condition, they do not pose a health problem. Asbestos-related diseases are very rare in those not occupationally exposed. Where they exist exposure has nearly always been to crocidolite. (author)

  5. Comparación de cianuro y tiourea como agentes lixiviantes de un mineral aurífero colombiano

    OpenAIRE

    José Isaí Santamaría Roncancio; Robinson de Jesús Torres Gómez; Mario Parra Pinilla; César Armando Ortiz Otálora

    2013-01-01

    Estudio preliminar de la lixiviación del oro a partir de un mineral aurífero procedente de Marmato (Caldas); como agentes lixiviantes se emplearon tiourea y cianuro sódico. El estudio se desarrolló en tres etapas: 1) caracterización del mineral mediante Difracción de Rayos X (DRX), Ensayo al Fuego y cuantificación de oro por Absorción Atómica (AA); 2) realización de lixiviaciones con los agentes a muestras minerales de 100 g, durante 8 horas, con una agitación de 800 rpm y temperatura ambient...

  6. The classification of minerals deposits

    International Nuclear Information System (INIS)

    In this part of book author present the classification of minerals deposits. Deposit formation take place as a result of complicated and long geology processes in the wide temperature intervals (from 1500 digC to usual) and pressures (from usual and to tens kilobars). Deposits of minerals as other investigation objects require in definite systematization on the base of definite characteristics

  7. 76 FR 6110 - Conflict Minerals

    Science.gov (United States)

    2011-02-03

    ... FR 80948 (December 23, 2010)]. The original comment period for Release No. 34-63547 is scheduled to... COMMISSION 17 CFR Parts 229 and 249 RIN 3235-AK84 Conflict Minerals AGENCY: Securities and Exchange... 1934 (the ``Exchange Act'') and would require any such issuer for which conflict minerals are...

  8. Mineral Atlas of the World

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    In 1997 the mineral resources of Europe and neighbouring countries were presented as a printed map and a book of exhaustive information and references. This was the first published map inventory of mineral deposits from all parts of the formerly politically divided Europe (East and West), measured and evaluated according to identical geological and mining standards.

  9. Plant macro- and micronutrient minerals

    Science.gov (United States)

    All plants must obtain a number of inorganic mineral elements from their environment to ensure successful growth and development of both vegetative and reproductive tissues. A total of fourteen mineral nutrients are considered to be essential. Several other elements have been shown to have beneficia...

  10. Gestão de fertilizantes de libertação gradual de nutrientes em relvados municipais

    OpenAIRE

    Magalhães, Paula

    2009-01-01

    Com vista a reduzir a contaminação ambiental associada ao uso de fertilizantes convencionais foram desenvolvidos os adubos que libertam os nutrientes de forma gradual, tentando assegurar um fornecimento mais regular de azoto às plantas durante o seu ciclo vegetativo, reduzindo o número de aplicações e restringindo as perdas de azoto. Os objectivos gerais do trabalho passaram por avaliar os efeitos dos fertilizantes de libertação gradual na produção de biomassa de um relvado ...

  11. El mineral de chayanta (Alto Perú): La sublevación indígena de 1781 y el auge minero

    OpenAIRE

    María Concepción Gavira Márquez

    2011-01-01

    Este trabajo representa el avance de una investigación más amplia sobre la minería en Chayanta, partido perteneciente a la intendencia de Potosí, durante las últimas décadas del siglo XVIII. Los llamados minerales de provincia o minerales de afuera fueron centros productores de plata y oro muy importantes durante el periodo colonial, pero hasta la fecha no se les ha prestado mucha atención por parte de la historiografía, y ni siquiera hemos estimado un cálculo de lo que representaba su produc...

  12. Mineral exploration in South Africa

    International Nuclear Information System (INIS)

    While the level of mineral exploration in much of Africa over the last ten to fifteen years has stagnated or declines, it has risen dramatically in South Africa. This chapter reviews this growth trend along with changes in the type of minerals sought through these exploration expenditures, and then identifies factors important to these shifts over time in the level and distribution of exploration expenditures. The chapter describes certain aspects of the South African mining industry which are important for exploration and which distinguish South Africa from other mineral-producing countries. Annual exploration expenditures for South Africa are shown in millions of current and constant (1982) and in figure 5-2 for the period from 1960 to 1983. The data include exploration for nonfuel minerals as well as two mineral fuels - uranium and coal

  13. 30 CFR 57.5070 - Miner training.

    Science.gov (United States)

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Miner training. 57.5070 Section 57.5070 Mineral... Agents, and Diesel Particulate Matter Diesel Particulate Matter-Underground Only § 57.5070 Miner training. (a) Mine operators must provide annual training to all miners at a mine covered by this part who...

  14. El comercio exterior durante la década revolucionaria: un acercamiento preliminar

    OpenAIRE

    Sandra Kuntz Ficker

    2001-01-01

    El propósito de este trabajo es realizar un primer acercamiento sistemático al análisis del comercio exterior de México durante la década de 1910. Tal objetivo se ha visto obstaculizado en el pasado por la escasez de fuentes cuantitativas de procedencia mexicana para los años de la revolución. Para suplir esta carencia, este artículo recurre a las estadísticas comerciales publicadas por los principales socios de México durante estos años (Estados Unidos, Gran Bretaña y Francia). A pa...

  15. COMPARTIMENTACIÓN INTERCELULAR DEL ACETATO EN NEURONAS Y ASTROCITOS DURANTE LA PRELACTANCIA

    OpenAIRE

    J. Tovar-Franco; Saavedra, F.

    2005-01-01

    Durante el período perinatal el cerebro utiliza sustratos alternativos a la glucosa para mantener su desarrollo, pues en este momento sus niveles están disminuidos. El acetato es metabolizado por las neuronas y los astrocitos durante la prelactancia. La utilización del acetato por estas células puede verse mejorada por lasreacciones fijadoras de CO2, algunas de las cuales participan en el mantenimiento de los intermediarios del TCA, que son reducidos por la producción y liberación de aminoáci...

  16. Comportamiento y propiedades de las fibras de polilactida (PLA) durante su procesado y uso

    OpenAIRE

    Cayuela Marín, Diana; Manich Bou, Albert

    2010-01-01

    Durante los últimos años los investigadores involucrados en el proyecto “Microestructura, caracterización, propiedades y aplicaciones de las fibras de polilactida” subvencionado por el Ministerio de Ciencia e Innovación (MAT2007-66569-C02) han estudiado cómo cambian las propiedades de la polilactida durante su procesado. Entre los trabajos llevados a cabo se incluye el estudio de condiciones óptimas de fijado, el studio de su degradabilidad y el desarrollo de técnicas de caracterización, entr...

  17. A capsulotomia descontínua durante a facoemulsificação

    OpenAIRE

    Virgilio Centurion; Augusto Cézar Lacava; Juan Carlos Caballero

    2011-01-01

    OBJETIVO: Descrever a prevalência, localização e causas da capsulotomia descontínua durante a cirurgia de catarata por facoemulsificação. MÉTODOS: Estudo retrospectivo, consecutivo, não comparativo de 971 cirurgias de catarata com capsulotomia descontínua no per-cirúrgico entre janeiro de 2009 a junho de 2010. RESULTADOS: Observou-se uma prevalência de 0,02% e a descontinuação da cápsula ocorreu em 100% das vezes durante o tratamento do núcleo. Em 58.33% dos olhos o implante foi realizado no ...

  18. El polen recogido por "Apis mellifera" L. en Hinojos (Huelva) durante la primavera

    OpenAIRE

    ORTIZ, PEDRO LUIS

    1994-01-01

    El polen recogido por Apis mellifera L. en Hinojos (Huelva) durante la primavera. Durante la primavera de 1986, periódicamente, se ha usado una trampilla cazapolen para obtener muestras de las cargas de polen recogidas por dos colmenas instaladas en Hinojos (Huelva). Dichas muestras se han pesado y se han estudiado microscópicamente. En cada una se han identificado los tipos polínicos encontrados y se han calculado sus porcentajes respecto al volumen; además se ha calculado un índice propo...

  19. Hipertrigliceridemia familiar grave durante a gestação Severe familial hypertriglyceridemia during pregnancy

    OpenAIRE

    Luiz Augusto Casulari; Myrian Wesgueber; Ricardo Cassiano B. Silva; Henrique F. Soares; Lucilia Domingues

    2001-01-01

    A presença de hipertrigliceridemia grave durante a gravidez é rara, mas comporta grande possibilidade de desenvolver complicações, como a pancreatite aguda, que coloca em risco a mãe e o feto. Apresentamos o relato da evolução da gestação de uma paciente portadora de hipertrigliceridemia grave que havia apresentado pancreatite aguda dois meses antes da fecundação. Foi tratada durante o pré-natal com dieta e 3,0 g de ácidos graxos de cadeia ômega-3 (ácidos eicosapentaenóico 14% e docosahexaenó...

  20. [Mineral water as a cure].

    Science.gov (United States)

    Nocco, Priska Binz

    2008-01-01

    The treatment of diseases with mineral spring water belongs to the oldest medical therapies. The "remedy" mineral water is therefore of importance also within the pharmacy. The present pharmacy historical work examines the impact of the use of mineral waters, as well as of their dried components, as therapeutic agents in the 19th and early 20th centuries, i.e. from approx. 1810 to 1930, as well as the contributions given by pharmacists in the development and analysis of mineral water springs. Beside these aspects, the aim here is also to describe the role played by pharmacists in the production of artificial mineral water as well as in the sale and wholesale of natural and artificial mineral water. In the first part of this work the situation in Switzerland and its surrounding countries, such as Germany, France, Italy and Austria, is discussed. The second part contains a case-study of the particular situation in the Canton Tessin. It is known from the scientific literature published at that time that information on mineral water was frequently reported. Starting from the beginning of the 19th century the number of such publications increased tremendously. The major part of them were publications in scientific journals or contributions to medical and pharmaceutical manuals and reference books. In particular the spa-related literature, such as spa-guides, was of growing interest to a broad public. The inclusion of monographs into the Swiss, the Cantonal as well the foreign pharmacopoeias granted a legal frame for the mineral waters and their dried components. These works are of major importance from a pharmacy historical standpoint and represent a unique proof of historical evidence of the old medicinal drug heritage. The most frequently used therapies based on mineral waters were drinking and bath cures. Several diseases, particularly those of a chronic character, were treated with mineral waters. The positive influence of these cures on the recovery of the patients

  1. Economic drivers of mineral supply

    Science.gov (United States)

    Wagner, Lorie A.; Sullivan, Daniel E.; Sznopek, John L.

    2003-01-01

    The debate over the adequacy of future supplies of mineral resources continues in light of the growing use of mineral-based materials in the United States. According to the U.S. Geological Survey, the quantity of new materials utilized each year has dramatically increased from 161 million tons2 in 1900 to 3.2 billion tons in 2000. Of all the materials used during the 20th century in the United States, more than half were used in the last 25 years. With the Earth?s endowment of natural resources remaining constant, and increased demand for resources, economic theory states that as depletion approaches, prices rise. This study shows that many economic drivers (conditions that create an economic incentive for producers to act in a particular way) such as the impact of globalization, technological improvements, productivity increases, and efficient materials usage are at work simultaneously to impact minerals markets and supply. As a result of these economic drivers, the historical price trend of mineral prices3 in constant dollars has declined as demand has risen. When price is measured by the cost in human effort, the price trend also has been almost steadily downward. Although the United States economy continues its increasing mineral consumption trend, the supply of minerals has been able to keep pace. This study shows that in general supply has grown faster than demand, causing a declining trend in mineral prices.

  2. Mineral Commodity Profiles -- Rubidium

    Science.gov (United States)

    Butterman, W.C.; Reese, R.G.

    2003-01-01

    Overview -- Rubidium is a soft, ductile, silvery-white metal that melts at 39.3 ?C. One of the alkali metals, it is positioned in group 1 (or IA) of the periodic table between potassium and cesium. Naturally occurring rubidium is slightly radioactive. Rubidium is an extremely reactive metal--it ignites spontaneously in the presence of air and decomposes water explosively, igniting the liberated hydrogen. Because of its reactivity, the metal and several of its compounds are hazardous materials, and must be stored and transported in isolation from possible reactants. Although rubidium is more abundant in the earth?s crust than copper, lead, or zinc, it forms no minerals of its own, and is, or has been, produced in small quantities as a byproduct of the processing of cesium and lithium ores taken from a few small deposits in Canada, Namibia, and Zambia. In the United States, the metal and its compounds are produced from imported raw materials by at least one company, the Cabot Corporation (Cabot, 2003). Rubidium is used interchangeably or together with cesium in many uses. Its principal application is in specialty glasses used in fiber optic telecommunication systems. Rubidium?s photoemissive properties have led to its use in night-vision devices, photoelectric cells, and photomultiplier tubes. It has several uses in medical science, such as in positron emission tomographic (PET) imaging, the treatment of epilepsy, and the ultracentrifugal separation of nucleic acids and viruses. A dozen or more other uses are known, which include use as a cocatalyst for several organic reactions and in frequency reference oscillators for telecommunications network synchronization. The market for rubidium is extremely small, amounting to 1 to 2 metric tons per year (t/yr) in the United States. World resources are vast compared with demand.

  3. Glycine Polymerization on Oxide Minerals

    Science.gov (United States)

    Kitadai, Norio; Oonishi, Hiroyuki; Umemoto, Koichiro; Usui, Tomohiro; Fukushi, Keisuke; Nakashima, Satoru

    2016-07-01

    It has long been suggested that mineral surfaces played an important role in peptide bond formation on the primitive Earth. However, it remains unclear which mineral species was key to the prebiotic processes. This is because great discrepancies exist among the reported catalytic efficiencies of minerals for amino acid polymerizations, owing to mutually different experimental conditions. This study examined polymerization of glycine (Gly) on nine oxide minerals (amorphous silica, quartz, α-alumina and γ-alumina, anatase, rutile, hematite, magnetite, and forsterite) using identical preparation, heating, and analytical procedures. Results showed that a rutile surface is the most effective site for Gly polymerization in terms of both amounts and lengths of Gly polymers synthesized. The catalytic efficiency decreased as rutile > anatase > γ-alumina > forsterite > α- alumina > magnetite > hematite > quartz > amorphous silica. Based on reported molecular-level information for adsorption of Gly on these minerals, polymerization activation was inferred to have arisen from deprotonation of the NH3 + group of adsorbed Gly to the nucleophilic NH2 group, and from withdrawal of electron density from the carboxyl carbon to the surface metal ions. The orientation of adsorbed Gly on minerals is also a factor influencing the Gly reactivity. The examination of Gly-mineral interactions under identical experimental conditions has enabled the direct comparison of various minerals' catalytic efficiencies and has made discussion of polymerization mechanisms and their relative influences possible Further systematic investigations using the approach reported herein (which are expected to be fruitful) combined with future microscopic surface analyses will elucidate the role of minerals in the process of abiotic peptide bond formation.

  4. Book review: Mineral resource estimation

    Science.gov (United States)

    Mihalasky, Mark J.

    2016-01-01

    Mineral Resource Estimation is about estimating mineral resources at the scale of an ore deposit and is not to be mistaken with mineral resource assessment, which is undertaken at a significantly broader scale, even if similar data and geospatial/geostatistical methods are used. The book describes geological, statistical, and geostatistical tools and methodologies used in resource estimation and modeling, and presents case studies for illustration. The target audience is the expert, which includes professional mining geologists and engineers, as well as graduate-level and advanced undergraduate students.

  5. Mineral exploration in developing countries

    International Nuclear Information System (INIS)

    The chapter provides an overview and comparisons of mineral exploration in Botswana and Papua New Guinea, including selection comparisons with Australia and Canada. It describes the history of exploration in Botswana and PNG. The concluding section summarizes the findings

  6. 77 FR 56273 - Conflict Minerals

    Science.gov (United States)

    2012-09-12

    ..., Release No. 34-63547 (Dec. 15, 2010) [75 FR 80948] (the ``Proposing Release''). \\5\\ Public Law 111-203... (Jan. 7, 2011) (``WGC I''). \\33\\ Conflict Minerals, Release No. 34-63793 (Jan. 28, 2011) [76 FR...

  7. BET measurements: Outgassing of minerals

    DEFF Research Database (Denmark)

    Clausen, Liselotte; Fabricius, Ida Lykke

    2000-01-01

    in minor errors, implying that aquifer sediments containing poorly crystalline materials can be outgassed at low temperatures if the outgassing time is increased. Scanning electron microscopy of the studied minerals demonstrated that the particle size as calculated from BET data compares well with......Outgassing minerals at elevated temperatures prior to BET measurements can lead to phase changes, especially in the case of amorphous and poorly crystalline materials. In order to evaluate the applicability of the BET method when low outgassing temperatures are required, selected aquifer minerals...... were outgassed at different temperatures and for different times. The studied minerals are 2-line ferrihydrite, goethite, lepidocrocite, quartz, calcite, ®-alumina, and kaolinite. The results demonstrate that measured specific surface areas of iron oxides are strongly dependent on outgassing conditions...

  8. US Forest Service Mineral Rights

    Data.gov (United States)

    US Forest Service, Department of Agriculture — A map service on the www depicting ownership parcels of the subsurface estate representing mineral rights; it is collected only if the subsurface estate is...

  9. Clay Minerals Deposit of Halakabad (Sabzevar- Iran)

    OpenAIRE

    Seyed Mohammad Hashemi

    2012-01-01

    Clay minerals are expanded in south of Sabzevar. They are identified with light color in the filed. The XRD and XRF chemical and mineralogical studies on the Clay minerals indicated that their main clay minerals are Kaolinite, Illite and Dickite. Pyrophyllite is minor clay mineral. Quartz and Sanidine non clay minerals are present with clay minerals .Ratio of Al2O3 is about 40 per cent, it is very good for industrial minerals .Volcanic rocks are origin clay minerals .Their composition are bas...

  10. Mineral of the month: magnesium

    Science.gov (United States)

    Kramer, Deborah A.

    2005-01-01

    Magnesium, often confused with last month’s mineral of the month manganese, is valued primarily because of its light weight and high strength-to-weight ratio. Magnesium is the eighth most abundant element and constitutes about 2 percent of the Earth’s crust. It is the third most plentiful element dissolved in seawater, with a concentration averaging 0.13 percent. Magnesium is found in over 60 minerals, and also is recovered from seawater, wells, and lake brines and bitterns.

  11. Arquitectura y estructura urbana en el Rif Central durante la primera mitad del siglo XX

    OpenAIRE

    Bravo Nieto, Antonio

    2013-01-01

    La región del Rif Central presenta unas características muy singulares respecto a su arquitectura y urbanización, que se basan en las realizaciones llevadas a cabo durante la primera mitad del siglo XX por la administración española en Marruecos. Ciu

  12. Desempenho de novilhos consumindo suplemento mineral proteinado convencional ou com uréia

    Directory of Open Access Journals (Sweden)

    Zanetti Marcus Antonio

    2000-01-01

    Full Text Available Foram utilizados 48 bovinos mestiços, com a finalidade de testar quatro suplementos minerais comerciais: Tratamento A - Sal proteinado sem uréia (com 20% de proteína bruta; B - Sal proteinado com uréia (com 52,5% de proteína bruta; C - Sal mineral; e D - Sal mineral com uréia (91% de proteína bruta. Os 48 animais foram distribuídos em 24 piquetes de capim Braquiaria decumbens, com suplementação de 10,5 kg de cana-de-açúcar/cab./dia, durante 112 dias, sendo 28 de adaptação e 84 de coleta de dados. Os animais foram pesados no início e no final do experimento, sendo que o controle da ingestão do suplemento mineral foi realizado semanalmente. O ganho de peso e o consumo do suplemento, em g/dia, nos tratamentos A, B, C e D, foram: 86 e 325; 357 e 650; -96 e 57; e 207 e 135, respectivamente. O pior resultado foi obtido pelos animais que receberam apenas sal mineral e o melhor, pelos animais que receberam o suplemento proteinado com uréia. O grupo que recebeu proteinado sem uréia apresentou desempenho semelhante ao do grupo que recebeu apenas sal mineral com uréia.

  13. Mineral commodity profiles: nitrogen

    Science.gov (United States)

    Kramer, Deborah A.

    2004-01-01

    Overview -- Nitrogen (N) is an essential element of life and a part of all animal and plant proteins. As a part of the DNA and RNA molecules, nitrogen is an essential constituent of each individual's genetic blueprint. As an essential element in the chlorophyll molecule, nitrogen is vital to a plant's ability to photosynthesize. Some crop plants, such as alfalfa, peas, peanuts, and soybeans, can convert atmospheric nitrogen into a usable form by a process referred to as 'fixation.' Most of the nitrogen that is available for crop production, however, comes from decomposing animal and plant waste or from commercially produced fertilizers. Commercial fertilizers contain nitrogen in the form of ammonium and/or nitrate or in a form that is quickly converted to the ammonium or nitrate form once the fertilizer is applied to the soil. Ammonia is generally the source of nitrogen in fertilizers. Anhydrous ammonia is commercially produced by reacting nitrogen with hydrogen under high temperatures and pressures. The source of nitrogen is the atmosphere, which is almost 80 percent nitrogen. Hydrogen is derived from a variety of raw materials, which include water, and crude oil, coal, and natural gas hydrocarbons. Nitrogen-based fertilizers are produced from ammonia feedstocks through a variety of chemical processes. Small quantities of nitrates are produced from mineral resources principally in Chile. In 2002, anhydrous ammonia and other nitrogen materials were produced in more than 70 countries. Global ammonia production was 108 million metric tons (Mt) of contained nitrogen. With 28 percent of this total, China was the largest producer of ammonia. Asia contributed 46 percent of total world ammonia production, and countries of the former U.S.S.R. represented 13 percent. North America also produced 13 percent of the total; Western Europe, 9 percent; the Middle East, 7 percent; Central America and South America, 5 percent; Eastern Europe, 3 percent; and Africa and Oceania

  14. Study on mineral processing technology for abrasive minerals

    Energy Technology Data Exchange (ETDEWEB)

    Hong, Seong Woong; Yang, Jung Il; Hwang, Seon Kook; Choi, Yeon Ho; Cho, Ken Joon; Shin, Hee Young [Korea Inst. of Geology Mining and Materials, Taejon (Korea, Republic of)

    1995-12-01

    Buyeo Materials in Buyeogun, Choongnam province is a company producing feldspar concentrate, but does not yet utilize the garnet as abrasive material and other useful heavy minerals wasted out from the process of feldspar ore. The purpose of this study is to develop technology and process for the recovery of garnet concentrate. As results, the garnet is defined as ferro manganese garnet. The optimum process for recovery of garnet concentrate is to primarily concentrate heavy minerals from tailings of feldspar processing. And secondly the heavy minerals concentrated is dried and separated garnet concentrate from other heavy minerals. At this time, the garnet concentrate is yield by 0.176%wt from 0.31%wt of heavy minerals in head ore. The garnet concentrate contains 33.35% SiO{sub 2}, 12.20% Al{sub 2}O{sub 3}, 28.47% Fe{sub 2}O{sub 3}, 11.96% MnO. As for utilization of abrasive materials, a fundamental data was established on technology of grinding and classification. (author). 13 refs., 47 figs., 24 tabs.

  15. Origin and nature of the aluminium phosphate-sulfate minerals (APS associated with uranium mineralization in triassic red-beds (Iberian Range, Spain

    Directory of Open Access Journals (Sweden)

    Marfil, R.

    2013-06-01

    Full Text Available This study focuses on the mineralogical and chemical study of an Aluminium–phosphate–sulphate (APS mineralization that occurs in a clastic sequence from the Triassic (Buntsandstein of the Iberian Range. The deposit is constituted by sandstones, mudstones, and conglomerates with arenaceous matrix, which were deposited in fluvial to shallow-marine environments. In addition to APS minerals, the following diagenetic minerals are present in the clastic sequence: quartz, K-feldspar, kaolinite group minerals, illite, Fe-oxides-hidroxides, carbonate-sulphate cement-replacements and secondary uraniferous minerals. APS minerals were identified and characterized by optical microscopy, X-ray diffraction, scanning electron microscopy, and electron microprobe. Microcrystalline APS crystals occur replacing uraniferous minerals, associated with kaolinite, mica and filling pores, in distal fluvial-to-tidal arkoses-subarkoses. Given their Ca, Sr, and Ba contents, the APS minerals can be defined as a solid solution of crandallite-goyacite-gorceixite (0.53 Ca, 0.46 Sr and 0.01 Ba. The chemical composition, low LREE concentration and Sr > S suggest that the APS mineral were originated during the supergene alteration of the Buntsandstein sandstones due to the presence of the mineralizing fluids which causes the development of U-bearing sandstones in a distal alteration area precipitating from partially dissolved and altered detrital minerals. Besides, the occurrence of dickite associated with APS minerals indicates they were precipitated at diagenetic temperatures (higher than 80ºC, related to the uplifting occurred during the late Cretaceous post-rift thermal stage.Este trabajo se centra en el estudio de los minerales fosfato-sulfato alumínicos (APS que se producenen una secuencia clástica del Triásico (Buntsandstein de la Cordillera Ibérica. El depósito está constituido por areniscas, lutitas y conglomerados con matriz arenosa, que fueron depositados en

  16. Biomineralization: mineral formation by organisms

    Science.gov (United States)

    Addadi, Lia; Weiner, Steve

    2014-09-01

    Organisms form many different types of minerals, with diverse shapes and sizes. These minerals fulfill a variety of functions. Inspired by the late H A Lowenstam, Steve Weiner and Lia Addadi have addressed many questions that relate to the mechanisms by which biological organisms produce these mineral phases and how their structures relate to their functions. Addadi and Weiner have explored the manner in which macromolecules extracted from mineralized tissues can interact with some crystal planes and not others, how these macromolecules can be occluded inside the forming crystals residing preferentially on specific crystal planes, and how they can induce one polymorph of calcium carbonate and not another to nucleate. Addadi and Weiner have also identified a novel strategy used by the sea urchin to form its smooth and convoluted mineralized skeletal elements. The strategy involves the initial production by cells of a highly disordered mineral precursor phase in vesicles, and then the export of this so-called amorphous phase to the site of skeletal formation, where it crystallizes. This strategy is now known to be used by many different invertebrate phyla, as well as by vertebrates to build bones and teeth. One of the major current research aims of the Weiner--Addadi group is to understand the biomineralization pathways whereby ions are extracted from the environment, are transported and deposited inside cells within vesicles, how these disordered phases are then transferred to the site of skeletal formation, and finally how the so-called amorphous phase crystallizes. Biology has clearly evolved unique strategies for forming crystalline minerals. Despite more than 300 years of research in this field, many challenging questions still remain unanswered.

  17. Mineral-resource data bases

    Science.gov (United States)

    ,

    1997-01-01

    Data bases are essential for modern scientific research. The new and exciting work being done in the Mineral Resource Program in the U.S. Geological Survey (USGS) usually begins with the question, "Where are the known deposits?" A mineral-resource data base containing this type of information and more can be useful not just to USGS scientists, but to anyone who needs such data. Users of the data bases from outside the USGS include mining and exploration companies, environmental groups, academia, other Federal Agencies, and the general public. At present, the USGS has two large mineral-resource data bases, MRDS (Mineral Resource Data System) and MAS (Minerals Availability System). MRDS was built and is mamtained by the USGS, and MAS was built and maintained by the Bureau of Mines. In 1996, after the Bureau was abolished, MAS was transferred to the USGS. The two data bases were compiled for different purposes and contain very different mformation. For instance, MAS contains information on costs, details of mining methods, and feasibility studies. MRDS has mineralogical and geologic data that are not contained in MAS. Because they are both mineral-resource data bases, however, they contain some information in common, such as location, name(s) of sites, and commodities present. Both data bases are international in scope, and both are quite large. MRDS contains over 110,000 records, while MAS has over 220,000. One reason that MAS has more records is that it contains information on smelters, mill sites, and fossil fuel sites, as well as mineral- resource sites. The USGS is working to combine the information in both data bases. This is a large undertaking that will require some years to complete. In the interim, information from both data bases will still be available

  18. 21 CFR 573.680 - Mineral oil.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 6 2010-04-01 2010-04-01 false Mineral oil. 573.680 Section 573.680 Food and... Listing § 573.680 Mineral oil. Mineral oil may be safely used in animal feed, subject to the provisions of this section. (a) Mineral oil, for the purpose of this section, is that complying with the...

  19. Effect of mineral processing wastewater on flotation of sulfide minerals

    Institute of Scientific and Technical Information of China (English)

    CHEN Jian-ming; LIU Run-qing; SUN Wei; QIU Guan-zhou

    2009-01-01

    The effects of mineral processing wastewater on sulfide minerals were investigated by flotation, infrared spectrometry and electrochemistry test. The results show that lead-concentrate water can improve the flotation of galena, while the sulfur-concentrate water has negative effect on flotation of galena compared with distilled water. The flotation behavior of pyrite is contrary to that of galena in three kinds of water. Infrared spectra indicate that the residual collector in the lead-concentrate water is beneficial to the formation of lead xanthate on the surface of galena. Electrochemistry results indicate that electrochemistry reaction on galena surface has apparent change. The anode polarization is improved and cathode polarization is depressed.

  20. KeyPathwayMinerWeb

    DEFF Research Database (Denmark)

    List, Markus; Alcaraz, Nicolas; Dissing-Hansen, Martin;

    2016-01-01

    We present KeyPathwayMinerWeb, the first online platform for de novo pathway enrichment analysis directly in the browser. Given a biological interaction network (e.g. protein-protein interactions) and a series of molecular profiles derived from one or multiple OMICS studies (gene expression......, for instance), KeyPathwayMiner extracts connected sub-networks containing a high number of active or differentially regulated genes (proteins, metabolites) in the molecular profiles. The web interface at (http://keypathwayminer.compbio.sdu.dk) implements all core functionalities of the KeyPathwayMiner tool set...... such as data integration, input of background knowledge, batch runs for parameter optimization and visualization of extracted pathways. In addition to an intuitive web interface, we also implemented a RESTful API that now enables other online developers to integrate network enrichment as a web service...

  1. Clay minerals in pollution control

    Energy Technology Data Exchange (ETDEWEB)

    Tateo, F. [Consiglio Nazionale delle Ricerche, Istituto di Ricerca sulle Argille, Tito Scalo, PZ (Italy)

    2000-07-01

    Clay minerals are fundamental constituents of life, not only as possible actors in the development of life on the Earth (Cairns-Smith and Hartman, 1986), but mainly because they are essential constituents of soils, the interface between the solid planet and the continental biosphere. Many, many authors have devoted themselves to the study of clays and clay minerals since the publication of the early modern studies by Grim (1953, 1962) and Millot (1964). In those years two very important associations were established in Europe (Association Internationale pour l'Etude des Argiles, AIPEA) and in the USA (Clay Mineral Society, CMS). The importance of these societies is to put together people that work in very different fields (agronomy, geology, geochemistry, industry, etc.), but with a common language (clays), very useful in scientific work. Currently excellent texts are being published, but introductory notes are also available on the web (Schroeder, 1998).

  2. Geochemistry and Minerality of Wine

    Science.gov (United States)

    Oze, C.; Horton, T. W.; Beaman, M.

    2010-12-01

    Kaolinite (Al2Si2O5(OH)4) and gibbsite (Al(OH)3) are capable of forming in a variety of environments including anthropogenic solutions such as wine. Here, we evaluate the geochemistry of twelve white wines in order to assess the potential relationship between kaolinite/gibbsite saturation and minerality, a common wine descriptor used to express the rock and/or soil character in the aromas and flavors of wines. Aluminum and Si concentrations ranged from 228-1,281 µg L-1 and 6,583-19,746 µg L-1, respectively, where Si and Al are the only elements to demonstrate positive covariance with minerality scores. Sulfur levels varied from 25,013-167,383 µg L-1 and show the strongest negative covariance with minerality scores. However, like all of the elements studied (Al, Si, Na, Mg, S, K, Ca, and Fe), these trends were not significantly different than random at the 95% confidence level. In contrast, the relative degrees of gibbsite/kaolinite saturation display strong positive covariance with minerality scores and these trends are not random at the greater than 95% confidence level. Overall, our tasters were able to accurately assess the degree of gibbsite/kaolinite saturation amongst the twelve wines based on the objective of assessing minerality. Although the wines were undersaturated with respect to gibbsite/kaolinite, geochemical modeling reveals that increasing the wines’ pHs from ~3.3 to 4.1-4.6 (which is achievable on the palate where saliva has a pH of 7.4) results in gibbsite/kaolinite oversaturation. By considering that minerality is a function of gibbsite/kaolinite saturation and decreasing S, the origin of minerality’s taste and chemical origin in wine with known physical standards becomes increasingly crystalline.

  3. Las fuerzas armadas durante la Guerra de Reforma (1856-1867

    Directory of Open Access Journals (Sweden)

    CONRADO HERNÁNDEZ LÓPEZ

    2008-01-01

    Full Text Available Resulta complicado hablar de fuerzas armadas durante la época de Benito Juárez, en particular durante la Reforma y el Segundo Imperio. En general, los ejércitos que contendieron desde 1854 hasta 1867, se organizaron según dos modelos que se originaron a finales del siglo XVIII, cuando la disconformidad en la estructura de las fuerzas armadas reflejó las diferencias en el modelo de Estado a partir de dos proyectos que tendían a fortalecer la autonomía provincial, con la organización de milicias o la función centralizadora del ejército permanente.

  4. Aspectos Psicológicos y Emocionales durante la gestación y el puerperio

    OpenAIRE

    Sastre Miras, Irene

    2015-01-01

    Decidí tratar el tema de los aspectos psicológicos y emocionales durante la gestación y el puerperio porque durante mi rotación por la Unidad de Hospitalización de Obstetricia del HURH realicé una valoración basada en la observación, mediante la que percibí que la forma en que las mujeres experimentaban la maternidad, no era siempre positiva y no recibían una atención especial, puesto que la prioridad de actuación está referida a los aspectos físicos. Para llevar a cabo mi TFG realicé una ...

  5. La incineració funerària a Sardenya durant l'Edat de Bronze

    OpenAIRE

    Malgosa Morera, Assumpció

    2008-01-01

    Els últims estudis arqueològics indicaven que fins a l'arribada de la cultura fenícia al Mediterrani Occidental (s. IX a.C), la inhumació semblava ser l'única pràctica funerària durant la prehistòria de Sardenya. Ara, la història podria reescriure's degut a una recent excavació duta a terme a la Tomba IX de Sa Figu, prop de la ciutat italiana de Sassari. Mitjançant una anàlisi física-química de la combustió dels ossos trobats a la necròpoli s'ha demostrat que sí s'utilitzava el foc durant els...

  6. Escurecimento interno de pêra asiática 'Ya Li' durante o armazenamento refrigerado

    Directory of Open Access Journals (Sweden)

    BRACKMANN AURI

    2002-01-01

    Full Text Available A pêra 'Ya Li' apresenta escurecimento da polpa poucos dias após o armazenamento refrigerado. Este trabalho objetivou avaliar condições de armazenamento visando a diminuir os danos pela baixa temperatura inicial em peras 'Ya Li'. As condições iniciais estabelecidas foram: 1 0ºC; 2 5ºC, nos 10 primeiros dias, com redução de 0,7ºC por dia, durante sete dias; 3 10ºC nos 10 primeiros dias, com redução de 1,4ºC por dia, durante sete dias; 4 10º C nos 10 primeiros dias, com redução de 1,4ºC por dia, durante sete dias, sempre em atmosfera controlada (2,0kPa de O2 e < 1,0kPa de CO2; 5 10ºC nos 10 dias iniciais, com posterior exposição direta dos frutos a 0ºC. Em seqüência aos tratamentos iniciais, os frutos foram submetidos ao armazenamento refrigerado a 0ºC, com exceção do tratamento "4" que foi mantido continuamente em atmosfera controlada. Após 52 dias de armazenamento, verificou-se escurecimento interno, superior a 68% em todos os tratamentos. As temperaturas mais elevadas, no início, não evitaram a ocorrência do escurecimento durante o armazenamento.

  7. La cinematograf??a anarquista en Barcelona durante la Guerra Civil (1936-1939)

    OpenAIRE

    Mart??nez Mu??oz, Pau

    2008-01-01

    La tesi doctoral tracta sobre la producci?? cinematogr??fica realitzada pel moviment anarcosindicalista a Barcelona durant la Guerra Civil espanyola (1936-1939). Un corpus total de vuitanta tres t??tols, malgrat a l'actualitat nom??s es conserven quaranta i quatre cintes i no totes complertes.La investigaci?? est?? centrada en la recopilaci?? i catalogaci?? exhaustiva de tota la filmografia existent: reportatges de guerra, documentals de propaganda i pel??l??cules de ficci??. Se ha realitzat ...

  8. Los castigos durante la esclavitud en la provincia de santa marta 1800-1851

    Directory of Open Access Journals (Sweden)

    Wilfredo Padilla Pinedo

    2014-02-01

    Full Text Available Muy a pesar de que la legislación española considero que los esclavos como seres humanos dejando claro como esclavitud no los privaba de su condición humana la sociedad esclavista los trato como animales negándoles el conocimiento estipulado por la ley durante muchos tiempos quedando así el negro esclavo como desprovisto de los más mínimos derechos.

  9. MANIFESTACIONES DE VIOLENCIA EXPLÍCITA O EVIDENTE DURANTE EL DESARROLLO DEL RECREO ESCOLAR

    Directory of Open Access Journals (Sweden)

    Jenny María Artavia Granados

    2012-01-01

    Full Text Available Este artículo es producto de un proceso de investigación realizado en una escuela de la Dirección Regional de Educación Occidente. Su finalidad fue determinar si en el intervalo de los recreos de la escuela en estudio, se suscitaban manifestaciones de violencia escolar explícita entre estudiantes de IV, V y VI año del II Ciclo de la Educación General Básica. Durante el desarrollo del estudio, se tomaron en cuenta aspectos relacionados con las actividades lúdicas y las interacciones personales que se presentaban en estos espacios escolares. Sobre todo, los que podrían propiciar violencia escolar explícita; los mecanismos de prevención y estrategias empleadas por la escuela para contrarrestar la violencia escolar; también el nivel de integración del personal docente y administrativo de la escuela durante el periodo de los recreos. Asimismo, se plantearon algunas conclusiones entre las que destacan que un alto porcentaje de niños y niñas manifiesta que existen enfrentamientos entre estudiantes, durante el desarrollo de los recreos, y que estos se perciben a través de comportamientos de violencia tanto física como verbal. Las manifestaciones de violencia más comunes son peleas, golpes así como el uso de un lenguaje soez y ofensivo. Los motivos de los enfrentamientos varían según el nivel escolar entre el estudiantado. Los mecanismos empleados por la escuela para contrarrestar la violencia que se suscita durante los recreos, se basan en el uso de procedimientos sancionadores y la aplicación de medidas preventivas.

  10. Factores que inciden en el desarrollo metacognitivo de los estudiantes durante la investigación

    Directory of Open Access Journals (Sweden)

    Nuris Chirinos Molero

    2013-01-01

    Full Text Available La metacognición permite en los procesos de investigación reconocer las habilidades y destrezas, así como los obstáculos o limitaciones que se presentan en los estudiantes durante la realización del trabajo de grado. De allí que, el objetivo general de este estudio es diagnosticar los factores que inciden en los procesos metacognitivos de los estudiantes durante la investigación. En lo metodológico, se consideró el paradigma positivista, el tipo de investigación fue descriptivo. El diseño considerado fue de campo, pues se realizó en la Maestría Docencia para Educación Superior del Postgrado de la Universidad Nacional Experimental Rafael María Baralt. Los resultados evidenciaron que durante el proceso de la investigación los estudiantes se encuentran influenciados por el estrés y el escaso acompañamiento institucional, dado que la mayoría respondió que al culminar la escolaridad, algunas veces, sentían el apoyo de la institución. Por lo que la institución deberá promover un plan de acción para mejorar las políticas institucionales con el cumplimiento total de las mismas, con el propósito de incrementar la producción científica.

  11. CAPACIDAD ANATIOXIDANTE DURANTE LA MADURACIÓN DE ARAZÁ (Eugenia stipitata Mc Vaugh

    Directory of Open Access Journals (Sweden)

    Adrian Mauirica Vargas

    2008-03-01

    Full Text Available Con el propósito de conocer la evolución de algunos componentes antioxidantes de la pulpa de arazá durante el almacenamiento de los frutos, éstos se cosecharon en su madurez fisiológica y se almacenaron durante seis días a 25 ºC. Se encontróque los frutos presentan su máximo climatérico luego de dos días de almacenamiento y, al llegar al sexto día, sus características sensoriales están marcadamente deterioradas. Los contenidos de ácido ascórbico y fenólicos disminuyeron durante el almacenamiento. Los niveles encontrados de ácido ascórbico, compuestos fenólicos y la actividad anti-oxidante muestran que la contribución de la pulpa de arazá al potencial antioxidante, cuando se compara con otros alimentos, en la dieta humana es buena.

  12. Estudo mineral de plantas medicinais

    Directory of Open Access Journals (Sweden)

    Maria de Fátima Gomes Lopes

    2002-01-01

    Full Text Available Determinations of Ca, Cu, Fe, Mg, Mn and Zn were evaluated in five different samples of medicinal plant leaves. Atomic absorption spectrometry was applied to the metals quantification. Except for Fe in Artemisia vulgaris L, significant levels of these elements were found in all investigated plant as compared to other vegetables which are abundant concerning that mineral content.

  13. Lagoa Real design - Mineral engineering

    International Nuclear Information System (INIS)

    This paper presents the works realized, in course and to realize of Lagoa Real Design, including the works for implantation of Mineral-Industrial complex with the production capacity of 1.000 ton of U sub(3) O sub(8) per year from 1988. (author)

  14. ROCKS & MINERALS DETERMINATION AND ANALYSIS

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    <正>20070252 Chen Meilan (Biological and Environmental College, Zhejiang Shuren University, Hangzhou 310015, China); Li Li Study on Adsorption of Phenol by Modified Organobentonite (Rock and Mineral Analysis, ISSN0254-5357, CN11-2131/TD, 24(4), 2005, p.259-261, 267, 6 illus., 1 table, 11 refs.) Key words: bentonite, benzene, adsorption

  15. ROCKS & MINERALS DETERMINATION AND ANALYSIS

    Institute of Scientific and Technical Information of China (English)

    2014-01-01

    <正>20140786Deng Zhenping(Institute of Karst Geology,Chinese Academy of Geological Sciences,Guilin 541004,China);Yang Wen-qiong Application of Stripping Voltammetry with a Solid Amalgam Electrode for Determination of Copper in a Tracer and Groundwater Tracing Experiment(Rock and Mineral Analy-

  16. Miners take stock after Chernobyl

    International Nuclear Information System (INIS)

    Australia's uranium producers, already facing a tough market have been plunged further into the unknown following the accident at Chernobyl. The production of uranium in Australia is reviewed with emphasis on the three uranium miners -Queensland Mines, Energy Resources of Australia and Western Mining Corporation

  17. Oceans: Geochemistry and mineral resources

    Digital Repository Service at National Institute of Oceanography (India)

    Joao, H.M.; Paropkari, A.L.

    , Indian became the first country to have been allocated exclusive rights of exploration in the pioneer area in the Central Indian Ocean Basin. Presently world wide some of the near-shore deposits are being exploited. However, the mining for other mineral...

  18. Receptores implicados en el efecto neurotrófico del ácido oleico durante el desarrollo del SNC

    OpenAIRE

    Bento Abreu, André Fábio

    2008-01-01

    La existencia de un receptor específico para la albúmina en el cerebro, responsable de la elevada concentración de la albúmina en el cerebro durante los primeros días de vida posnatal y cuya expresión se encuentre regulada durante el desarrollo, se ha postulado durante décadas. Sin embargo, se desconocía todavía la naturaleza del receptor, así como el tipo de endocitosis empleada para la internalización de la albúmina en los astrocitos. En este trabajo, hemos observado que la megalina, la cav...

  19. Radiological hazards to uranium miners

    International Nuclear Information System (INIS)

    The purpose of the present document is to review and assess the occupational hazards to uranium miners in Canada. Amendments to regulations set the maximum permissible dose to uranium miners at 50 mSv per year. Uranium miners are exposed to radon and thoron progeny, external gamma radiation and long-lived alpha-emitting radionuclides in dust. The best estimate for the lifetime risk of inhaled radon progeny is about 3 x 10-4 lung cancers per WLM for the average miner, with a range of uncertainty from about 1 -6 x 10-4 per WLM. This central value is nearly twice as high as that recommended by the ICRP in 1981. The probability of serious biological consequences following exposure to external gamma rays is currently under review but is expected to be in the range of 3 - 6 x 10-2 Sv-1. Dosimetric calculations indicate that the stochastic risks per WLM of thoron progeny are about one-third of those for radon progeny. The annual limits on intake of inhaled ore dusts recommended by the ICRP are probably too low by at least a factor of two for the type of ore and dust normally encountered in underground uranium mines in Ontario; this is due in part to the fact that the average diameter of these dusts is five times greater than the value used by the ICRP. Radiological exposures of uranium miners in Canada were reviewed. The biological impact of these exposures were compared with those of conventional accidents on the basis of the years of normal life expectancy that are lost or seriously impaired due to occupational hazards. The objectives in considering all occupational risks are to reduce the total risk from all causes and to use funds spent for health protection as effectively as possible

  20. Microprobe to closely examine minerals

    International Nuclear Information System (INIS)

    The University of South Australia will develop synchrotron-based technology that can determine the structure and chemical composition of mineral samples at microscopic levels. The planned multi-analysis synchrotron X-ray facility Beam-line 11 is for implementing on the Australian Synchrotron. UniSA's Applied Centre for Structural and Synchrotron Studies (ACeSSS) will use Beamline 11 to shed new light on factors that constrain recoveries of copper and gold from typical copper ores. ACeSSS director Professor Andrea Gerson is working with an international team and the Australian Synchrotron on the design of Beamline 11. According to Gerson, there is scope to improve processing and/or increase recoveries in copper, gold and valueless pyrite either through separation, smelting, leaching or electro-processing. Using synchrotron technology, researchers will determine the structure and chemical composition of mineral samples to understand the fundamental behaviour of these materials in order to identify process and : environmental benefits. Three different strategies will be employed: tracing the movement of gold through the mineral processing chain to optimise and increase gold recovery; examining the surface layers formed when copper is leached from the mineral, chalcopyrite, to enhance the understanding of this surface layer formation and ultimately maximise cop-per recovery; and improving environmental remediation by understanding the mineralisation process during acid-rock drainage. ACeSSS will work with the minerals and environmental remediation sectors, building on the I establishment of the Cooperative Research Centre for Contamination Assessment and Remediation of the Environment, and cementing close collaboration with UniSA's Ian Wark Research Institute. Contributions from the SA Premier's Science and Research Fund, BHP Billiton and Rio Tinto, synchrotron partners Advanced Light Source (USA) and the Canadian Light Source Funding totalling $1.38m are available for

  1. Atelectasias durante anestesia: fisiopatologia e tratamento Atelectasias durante anestesia: fisiopatología y tratamiento Atelectasis during anesthesia: pathophysiology and treatment

    Directory of Open Access Journals (Sweden)

    Luiz Marcelo Sá Malbouisson

    2008-02-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: O colapso pulmonar intra-operatório é uma complicação de elevada incidência em pacientes submetidos à intervenção cirúrgica sob anestesia geral com relaxamento/paralisia da musculatura. Essa complicação está associada à piora das trocas gasosas no intra-operatório e, em alguns casos, necessidade de suporte respiratório prolongado no período pós-operatório. Os objetivos deste estudo foram revisar os aspectos fisiopatológicos da formação de atelectasias durante anestesia geral e as possíveis manobras terapêuticas para prevenir e tratar essa complicação. CONTEÚDO: Nesta revisão, os conceitos sobre a incidência de atelectasias intra-operatórias, os fatores relacionados com o seu desenvolvimento, tanto mecânicos quanto associados ao ajuste do respirador durante procedimento cirúrgico, os aspectos do diagnóstico e as estratégias de prevenção e tratamento foram abordados de maneira sistemática. CONCLUSÕES: A compreensão dos mecanismos relacionados com o desenvolvimento do colapso pulmonar durante o período intra-operatório, assim como o seu tratamento, pode contribuir para a redução da incidência de complicações pulmonares pós-operatórias, o tempo de recuperação e os custos hospitalares.JUSTIFICATIVA Y OBJETIVOS: El colapso pulmonar intraoperatorio es una complicación de elevada incidencia en pacientes sometidos a la intervención quirúrgica bajo anestesia general con relajamiento/parálisis de la musculatura. Esta complicación está asociada al empeoramiento de los cambios de gas en el intraoperatorio y en algunos casos, necesidad de soporte respiratorio prolongado en el período postoperatorio. Los objetivos de este estudio fueron los de revisar los aspectos fisiopatológicos de la formación de atelectasias durante anestesia general y las posibles maniobras terapéuticas para prevenir y tratar esa complicación. CONTENIDO: En esta revisión, los conceptos sobre la

  2. Aggregate and Mineral Resources - INDUSTRIAL_MINERALS_POINTS_IN: Industrial Mineral Data in Indiana (Indiana Geological Survey, Point Shapefile)

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — INDUSTRIAL_MINERALS_POINTS_IN is a shapefile that shows the distribution of stratigraphic data for various industrial minerals in Indiana. These data were derived...

  3. U.S. Geological Survey Mineral Resources Program—Mineral resource science supporting informed decisionmaking

    Science.gov (United States)

    Wilkins, Aleeza M.; Doebrich, Jeff L.

    2016-09-19

    The USGS Mineral Resources Program (MRP) delivers unbiased science and information to increase understanding of mineral resource potential, production, and consumption, and how mineral resources interact with the environment. The MRP is the Federal Government’s sole source for this mineral resource science and information. Program goals are to (1) increase understanding of mineral resource formation, (2) provide mineral resource inventories and assessments, (3) broaden knowledge of the effects of mineral resources on the environment and society, and (4) provide analysis on the availability and reliability of mineral supplies.

  4. Niveles de progesterona durante el ciclo normal y silencioso en bovinos en el trópico colombiano

    OpenAIRE

    Henry Grajales L; Aureliano Hernández V; Esperanza Prieto

    2010-01-01

    Objetivo. Determinar la secuencia de cambios en los niveles de progesterona (NP) durante el Ciclo Normal (CN) y Ciclo Silencioso (CS). Materiales y métodos. 94 Hembras de los grupos raciales Holstein x Cebú (HC), Simmental x Cebú (SC), Romosinuano (R) y Cebú (C) se estudiaron desde la pubertad y durante los tres primeros ciclos estrales. Se tomaron muestras de sangre para determinar las concentraciones de progesterona mediante Radioinmunoanálisis, se determinaron...

  5. Miscellaneous Industrial Minerals Operations - Direct Download

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This map layer includes miscellaneous industrial minerals operations in the United States. The data represent commodities covered by the Minerals Information Team...

  6. Mineral Operations of Latin America and Canada

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data set consists of records for over 900 mineral facilities in Latin America and Canada. The mineral facilities include mines, plants, smelters, or refineries...

  7. Characterization of biological mineralization in vitro

    NARCIS (Netherlands)

    Huitema, L.F.A.

    2006-01-01

    Mineralization is an essential requirement for normal skeletal development, which is generally accomplished through the function of two cell types, osteoblasts and chondrocytes. Soft tissues do not mineralize under normal conditions, but under certain pathological conditions some tissues like articu

  8. Vitamin and Mineral Supplement Fact Sheets

    Science.gov (United States)

    ... Tables Online DRI Tool Daily Value (DV) Tables Vitamin and Mineral Supplement Fact Sheets Search the list ... Supplements: Background Information Botanical Dietary Supplements: Background Information Vitamin and Mineral Fact Sheets Botanical Supplement Fact Sheets ...

  9. ARC Code TI: sequenceMiner

    Data.gov (United States)

    National Aeronautics and Space Administration — The sequenceMiner was developed to address the problem of detecting and describing anomalies in large sets of high-dimensional symbol sequences. sequenceMiner works...

  10. Mineral operations outside the United States

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — Mineral facilities and operations outside the United States compiled by the National Minerals Information Center of the USGS. This representation combines source...

  11. Mineral bridges in nacre revisited

    CERN Document Server

    Checa, Antonio G; Willinger, Marc-Georg

    2012-01-01

    We confirm with high-resolution techniques the existence of mineral bridges between superposed nacre tablets. In the towered nacre of both gastropods and the cephalopod Nautilus there are large bridges aligned along the tower axes, corresponding to gaps (150-200 nm) in the interlamellar membranes. Gaps are produced by the interaction of the nascent tablets with a surface membrane that covers the nacre compartment. In the terraced nacre of bivalves bridges associated with elongated gaps in the interlamellar membrane (> 100 nm) have mainly been found at or close to the edges of superposed parental tablets. To explain this placement, we hypothesize that the interlamellar membrane breaks due to differences in osmotic pressure across it when the interlamellar space below becomes reduced at an advanced stage of calcification. In no cases are the minor connections between superimposed tablets (< 60 nm), earlier reported to be mineral bridges, found to be such.

  12. Borate Minerals and RNA Stability

    Directory of Open Access Journals (Sweden)

    Ernesto Di Mauro

    2010-08-01

    Full Text Available The abiotic origin of genetic polymers faces two major problems: a prebiotically plausible polymerization mechanism and the maintenance of their polymerized state outside a cellular environment. The stabilizing action of borate on ribose having been reported, we have explored the possibility that borate minerals stabilize RNA. We observe that borate itself does not stabilize RNA. The analysis of a large panel of minerals tested in various physical-chemical conditions shows that in general no protection on RNA backbone is exerted, with the interesting exception of ludwigite (Mg2Fe3+BO5. Stability is a fundamental property of nucleic polymers and borate is an abundant component of the planet, hence the prebiotic interest of this analysis.

  13. Minerals

    Science.gov (United States)

    ... yogurt legumes, such as beans, split peas, and lentils Zinc Zinc helps your immune system, which is ... peanuts legumes, such as beans, split peas, and lentils When people don't get enough of these ...

  14. KNIME: the Konstanz Information Miner

    OpenAIRE

    Berthold, Michael R.; Cebron, Nicholas; Dill, Fabian; Di Fatta, Giuseppe; Gabriel, Thomas R.; Georg, Florian; Meinl, Thorsten; Ohl, Peter; Sieb, Christopher; Wiswedel, Bernd

    2006-01-01

    The Konstanz Information Miner is a modular environment, which enables easy visual assembly and interactive execution of a data pipeline. It is designed as a teaching, research and collaboration platform, which enables simple integration of new algorithms and tools as well as data manipulation or visualization methods in the form of new modules or nodes. In this paper we describe some of the design aspects of the underlying architecture and briefly sketch how new nodes can be incorporated.

  15. Inhalation hazards to uranium miners

    International Nuclear Information System (INIS)

    This project is investigating levels of uranium mine air contaminants, using both large and small experimental animals to model human respiratory system disease. Lung cancer and deaths by degenerative lung disease have reached epidemic proportions among uranium miners, but the cause-effect relationships for these diseases are based on inadequate epidemiological data. This project identifies agents or combinations of agents (both chemical and radiological) and their exposure levels that produce respiratory tract lesions, including respiratory epithelial carcinoma, pneumonconiosis and emphysema

  16. ROCKS & MINERALS DETERMINATION AND ANALYSIS

    Institute of Scientific and Technical Information of China (English)

    2013-01-01

    <正>20132374 Dong Yongsheng(Third Institute of Geologic Mineral Exploration and Development of Inner Mongolia Autonomous Region,Hohhot 010050,China);Cheng Haoyang Determination of Nb,Ta,Th,and Zr by X-Ray Fluorescence Spectrometry(Jilin Geology,ISSN1001-2427,CN22-1099/P,31(4),2012,p.113-114,129,3tables,2refs.)Key words:X-ray fluorescence spectra,rare

  17. Copper minerals under the microscope

    OpenAIRE

    Hjeltström, Anna

    2015-01-01

    From many perspectives copper is a very important metal for the modern society. It can be found in everything from jewellery to electronics. For this reason it is very important for geologists to be able to develop efficient methods for identification, characterisation, extraction and processing of copper. One method for the identification of copper bearing minerals is ore microscopy which has been used in this paper along with a general introduction. Samples from the study collection of the ...

  18. World mineral production 2004-2008

    OpenAIRE

    Brown, T. J.; Bide, T.; Hannis, S.D.; Idoine, N.E.; Hetherington, L.E.; R. A. Shaw; Walters, A S; Lusty, P.A.J.; Kendall, R.

    2010-01-01

    This volume is the latest in the series World Mineral Production, published by the British Geological Survey. It comprises the most recent addition to a continuous dataset on global mineral production which stretches back to 1913. It contains production statistics, by country, for the majority of economically important mineral commodities, including ferrous and non–ferrous metals, industrial minerals and hydrocarbons. Commentary is provided detailing the characteristics, uses, production t...

  19. Derecho, minería y (neo)colonialismo. Una aproximación crítica a la regulación de la minería de oro a gran escala en Colombia

    OpenAIRE

    Ximena Sierra-Camargo

    2014-01-01

    En este artículo se pretende reflexionar sobre la utilización del derecho en espacios de dominación (pos)colonial a partir de la regulación de la minería de oro a gran escala en Colombia. Esta problemática se plantea en el marco del modelo extractivista que se ha expandido durante los últimos años en Latinoamérica, entendiendo este como una manifestación del mito del desarrollo y como una continuación del legado colonial. La creciente presencia de compañías mineras transnacionales con la cola...

  20. Is Struvite a Prebiotic Mineral?

    Directory of Open Access Journals (Sweden)

    Matthew A. Pasek

    2013-04-01

    Full Text Available The prebiotic relevance of mineral struvite, MgNH4PO4·6H2O, was studied experimentally as a phosphorylating reagent and, theoretically, to understand the geochemical requirements for its formation. The effectiveness of phosphorylation by the phosphate mineral, monetite, CaHPO4, was also studied to compare to the efficiency of struvite. The experiments focused on the phosphorylation reactions of the minerals with organic compounds, such as nucleosides, glycerol and choline chloride, and heat at 75 °C for about 7–8 days and showed up to 28% phosphorylation of glycerol. In contrast, the compositional requirements for the precipitation of struvite are high ammonium and phosphate concentrations, as well as a little Ca2+ dissolved in the water. Combined, these requirements suggest that it is not likely that struvite was present in excess on the early Earth to carry out phosphorylation reactions. The present study focuses on the thermodynamic aspects of struvite formation, complementing the results given by Orgel and Handschuh (1973, which were based on the kinetic effects.

  1. Mineral zircon : A novel thermoluminescence geochronometer

    NARCIS (Netherlands)

    Van Es, HJ; Vainshtein, DI; De Meijer, RJ; Den Hartog, HW; Donoghue, JF; Rozendaal, A

    2002-01-01

    Mineral zircon contains trace amounts (typically 10-1000 ppm) of the alpha-emitters uranium and thorium, which irradiate this mineral internally. This outstanding feature of zircon turns out to be extremely useful when this mineral is applied as a thermoluminescence (TL) dating medium, because the b

  2. 43 CFR 8.5 - Mineral rights.

    Science.gov (United States)

    2010-10-01

    ... 43 Public Lands: Interior 1 2010-10-01 2010-10-01 false Mineral rights. 8.5 Section 8.5 Public... INTERIOR AND OF THE ARMY RELATIVE TO RESERVOIR PROJECT LANDS § 8.5 Mineral rights. Mineral, oil and gas rights will not be acquired except where the development thereof would interfere with project...

  3. Minería, mano de obra, y circulación monetaria en los Andes colombianos del siglo XVII

    OpenAIRE

    Heraclio Bonilla

    2001-01-01

    La economía en el Nuevo Reino de Granada giró casi exclusivamente en torno al oro de aluvión. Pese a esa situación, el examen del sector minero de la plata permite, analizar con mayor precisión los grandes temas que han preocupado a la historiografía colonial, y cuyos resultados se espera contribuyan tanto a contextualizar mejor la historia de la minería americana durante el periodo colonial como a un mayor conocimiento de la economía animada por la plata en la Nueva ...

  4. Bosquejo histórico de las principales bibliotecas habaneras durante el siglo XIX

    OpenAIRE

    Sánchez Baena , Juan José

    2000-01-01

    Recorrido histórico por las bibliotecas más importantes que existían en La Habana durante el siglo pasado. La primera biblioteca fue fundada por la RealSociedad Patriótica de Amigos del País en 1793, que al comenzar el siglo XIX haría pública su entrada, sirviendo tanto a la propia Sociedad como a las necesidades formativas de profesores y alumnos de la Universidad de San Jerónimo. Cuando fue necesario su traslado a otros locales más adecuados, la propia Universidad vio la n...

  5. La estrategia de inserción internacional durante el gobierno de Eduardo Duhalde

    OpenAIRE

    Colombo, Sandra; Ochoteco, Maia

    2005-01-01

    En el artículo se analiza los cambios y ajustes de la política exterior de Argentina durante la presidencia de Eduardo Duhalde en el marco de las relaciones con Estados Unidos y con el MERCOSUR. En el ámbito internacional, el gobierno tuvo dos objetivos fundamentales: 1) incrementar el acceso de la producción argentina en el mercado internacional mediante la negociación en escenarios múltiples y de manera simultánea, y 2) conseguir apoyo para reinsertar a la Argentina en el mundo luego del ai...

  6. Crecimiento económico y equidad en Boyacá durante 2000-2011

    Directory of Open Access Journals (Sweden)

    Edilberto Rodríguez Araújo

    2012-12-01

    Full Text Available El crecimiento económico no trae consigo mejoras inmediatas en la distribución del ingreso. Las políticas redistributivas pueden contribuir a corregir la inequidad social. El autor analiza cuál ha sido la incidencia del crecimiento de la economía boyacense, durante el periodo 2000-2011, en aspectos tales como pobreza, equidad distributiva, desarrollo humano y desempeño delmercado laboral, determinando que no existe una asociación positiva concluyente entre el dinamismo económico y sus correlatos sociales.

  7. Crecimiento económico y equidad en Boyacá durante 2000-2011

    OpenAIRE

    Edilberto Rodríguez Araújo

    2012-01-01

    El crecimiento económico no trae consigo mejoras inmediatas en la distribución del ingreso. Las políticas redistributivas pueden contribuir a corregir la inequidad social. El autor analiza cuál ha sido la incidencia del crecimiento de la economía boyacense, durante el periodo 2000-2011, en aspectos tales como pobreza, equidad distributiva, desarrollo humano y desempeño delmercado laboral, determinando que no existe una asociación positiva concluyente entre el dinamismo económico y sus corr...

  8. Evolución y determinantes de la autoestima durante los años adolescentes

    OpenAIRE

    Parra Jiménez, Agueda; Oliva Delgado, Alfredo; Sánchez Queija, María Inmaculada

    2004-01-01

    Los objetivos de este trabajo son analizar la evolución de la autoestima durante los años de la adolescencia, y conocer los factores que influyen sobre ella, prestando especial atención al papel del género. Una muestra de 221 chicos y 292 chicas de edades comprendidas entre los 12 y los 19 años completaron diferentes instrumentos referidos a su autoestima, la calidad del medio familiar, las relaciones con sus iguales y el rendimiento académico. Como principales resultados pode...

  9. La cinematografía anarquista en Barcelona durante la Guerra Civil (1936-1939)

    OpenAIRE

    Martínez Muñoz, Pau

    2008-01-01

    La tesi doctoral tracta sobre la producció cinematogràfica realitzada pel moviment anarcosindicalista a Barcelona durant la Guerra Civil espanyola (1936-1939). Un corpus total de vuitanta tres títols, malgrat a l'actualitat només es conserven quaranta i quatre cintes i no totes complertes.La investigació està centrada en la recopilació i catalogació exhaustiva de tota la filmografia existent: reportatges de guerra, documentals de propaganda i pel·lícules de ficció. Se ha realitzat l'anàlisi d...

  10. Significados durante el puerperio: a partir de prácticas y creencias culturales

    OpenAIRE

    Brigitte M. Prieto B.; Carmen Helena Ruiz

    2013-01-01

    Objetivo: describir el significado que le asigna la madre al cuidado cultural de ella misma y su recién nacido durante el puerperio, a partir de sus prácticas y creencias. Método: estudio con abordaje cualitativo de tipo etnográfico, realizado en Tunja, Colombia, en el que participaron ocho puérperas con parto normal y cuatro informantes generales, entre profesionales de enfermería y familiares de las puérperas. Los datos fueron analizados utilizando la guía de cuatro pasos de etnoenfermería ...

  11. El cine norteamericano durante la Gran Depresión (1929-1939)

    OpenAIRE

    Carmen Mainer

    2013-01-01

    El cine comienza su andadura a finales del siglo XIX como un mero entretenimiento de masas, revelando a un público ávido de novedades las posibilidades del reciente descubrimiento. Será a partir de la Revolución bolchevique de 1917 cuando los organismos de poder descubran la capacidad de la imagen en movimiento como herramienta de propaganda ideológica. Los regímenes comunista y fascista se sirvieron del cine para difundir su doctrina y en la democracia de Estados Unidos, durante el período d...

  12. Cambios durante el día en la capacidad del ser humano para resolver problemas

    OpenAIRE

    Aida García, Minerva; Valdez Ramírez, Pablo; Ramíresz Tule, Ma. Candelaria

    2012-01-01

    El objetivo de este trabajo fue identificar cambios durante el día en las funciones que se requieren para la solución de problemas: inhibición, flexibilidad y automonitoreo. Se registraron trece estudiantes universitarios voluntarios, por 29 horas continuas en el laboratorio, donde contestaron cada 100 min la prueba Stroop, que mide la inhibición y la flexibilidad, y la prueba de seguimiento, que mide el automonitoreo. Se encontró una disminución en las tres funciones ...

  13. COMPARTIMENTACIÓN INTRACELULAR DEL ACETATO EN NEURONAS DURANTE LA PRELACTANCIA

    OpenAIRE

    B. Barrios-Socha; J. Tovar-Franco

    2006-01-01

    En la transición a la vida extrauterina, el recién nacido sufre un período de ayuno (prelactancia) que transcurre entre el cese de la nutrición placentaria y la instauración de la lactancia. El gasto de energía por las neuronas es tan alto en estas circunstancias, que la glucogenólisis es incapaz de restablecer los niveles de glucosa en la sangre. En consecuencia, durante la prelactancia debe haber otros sustratos energéticos y lipogénicos, que adicionalmente ayuden a mantener la síntesis de ...

  14. Sepse durante a gestação: relato de caso Sepsis during pregnancy: case report

    OpenAIRE

    Renato Laks; José L. Pedroso; Juliana E. Marques Pinto; Aécio F. T. Gois

    2007-01-01

    JUSTIFICATIVA E OBJETIVOS: A sepse durante a gestação é uma complicação rara. O comprometimento fetal resulta principalmente da descompensação materna, por conseguinte, o tratamento deve ser direcionado ao bem-estar da mãe. Poucas evidências permitem extrapolar o tratamento de pacientes não gestantes para as gestantes, porém, o tratamento baseado no Surviving Sepsis Campaing parece adequado e prático. O objetivo deste estudo foi rever o tratamento da sepse na gestação e relatar um caso de ges...

  15. Las bibliotecas públicas durante el primer franquismo: entre la continuidad y la ruptura

    OpenAIRE

    Rodrigo Echalecu, Ana María

    2009-01-01

    En esta Memoria se analiza el concepto de biblioteca pública durante el primer franquismo, así como la organización bibliotecaria, los Centros Coordinadores de Bibliotecas, los diferentes tipos de bibliotecas públicas, así como el personal que las gestionó y sus instalaciones. Especial atención han recibido las bibliotecas municipales al estudiar el marco jurídico y su localización a través de una cartografía inédita.

  16. Enfermedades infecciosas probablemente dispersadas por los europeos durante el contacto indirecto en Tierra del Fuego

    OpenAIRE

    Fugassa, Martín H.; Guichón, Ricardo Aníbal

    2003-01-01

    Para la colonización de Norteamérica, ciertos autores sugieren que enfermedades infecciosas actuaron de modo discreto durante un período inicial llamado de Contacto Indirecto. Ello implicaría que los registros históricos con que contamos describan sociedades transformadas. Para Tierra del Fuego, Borrero establece la incertidumbre sobre el tamaño de las poblaciones previas a los primeros relatos de Gusinde y otros. Pretendemos brindar un marco probabilístico sobre las enfermedades infecciosas ...

  17. El cambio en el razonamiento bayesiano de estudiantes universitarios durante un semestre académico

    OpenAIRE

    Morgado, Cindy; Yáñez, Gabriel

    2013-01-01

    En este trabajo se presentan los avances de una investigación que estudia el cambio en el razonamiento bayesiano en estudiantes universitarios que toman un primer curso de estadística. Se desarrolla un estudio longitudinal con 102 estudiantes. Se diseñan tres pruebas para evaluar el razonamiento, las cuales se aplican en momentos diferentes durante el semestre. Un análisis descriptivo de los resultados obtenidos muestra que la enseñanza de los conceptos de probabilidad condicional y teorema d...

  18. Acidentes com Hipoclorito de Sódio durante o Tratamento Endodôntico

    OpenAIRE

    Serrão, Nadine Raquel Pereira Martins

    2014-01-01

    A endodontia tem vindo a evoluir substancialmente nas últimas décadas. O desenvolvimento de novas tecnologias e materiais, facilitam o trabalho do médico dentista e diminuem o tempo do tratamento endodôntico. Contudo, os insucessos estão relacionados diretamente com a persistência de microrganismos que resistem ao preparo químico-mecânico. A irrigação durante o tratamento endodôntico é, portanto, fundamental para que se consiga obter uma limpeza adequada do sistema de canais...

  19. Sanitat a Catalunya durant la República i la Guerra Civil

    OpenAIRE

    Hervas Puyal, Carlos

    2005-01-01

    La Tesi recull els intents d'orientar l'assistència sanitaria i social dels ciutadans de Catalunya per part dels governs amb capacitat de decisió autonòmica, en una línia que va des de les realitzacions de la Mancomunitat fins a les activitats dels consellers responsables de Sanitat i Assistència Social de la Generalitat Republicana.L'aixecament militar del 18 de juliol de 1936 obre un nou capítol durant el qual tots els elements de la vida del país i la seva gent es veuen trasbalsats pels ef...

  20. Consumo de antioxidantes durante tratamento quimioterápico Antioxidants consumption during chemotherapy treatment

    OpenAIRE

    Caroline Cavali Rohenkohl; Ana Paula Carniel; Elisângela Colpo

    2011-01-01

    RACIONAL: O câncer é definido como enfermidade multicausal crônica, em que as células possuem crescimento descontrolado. Resulta de vários fatores, sendo um dos principais, a dieta inadequada. As fases de iniciação, promoção e progressão de carcinogênese têm sido frequentemente relacionadas ao estresse oxidativo. OBJETIVO: Verificar o consumo de antioxidantes em pacientes com câncer durante os diferentes ciclos de quimioterapia. MÉTODOS: Estudo descritivo exploratório, incluindo pacientes em ...

  1. Los asentamientos mineros en la minería aurífera de Nueva Granada durante la época colonial

    OpenAIRE

    Enrique ORCHE GARCÍA; Octavio PUCHE RIART

    2000-01-01

    El Virreinato de Nueva Granada ocupaba el área que hoy comprende, total o parcialmente, Colombia, Ecuador, Venezuela y Panamá. Desde las primeras incursiones en este vasto territorio, los españoles constataron la enorme riqueza aurífera existente tanto en los aluviales de sus ríos como en los innumerables filones de cuarzo aflorantes en su agreste orografía y, por ello, acometieron la explotación sistemática de los yacimientos de oro en cuanto obtuvieron todo el metal que los indios fueron ca...

  2. Sorption of pesticides to aquifer minerals

    DEFF Research Database (Denmark)

    Clausen, Liselotte; Fabricius, Ida Lykke

    2000-01-01

    This paper summarizes results from a work were the sorption of five pesticides on seven minerals were studied in order to quantify the adsorption to different mineral surfaces. Investigated mineral phases are: quartz, calcite, kaolinite, a-alumina, and three iron oxides (2-line ferrihydrite......, goethite, lepidocrocite). Selected pesticides are: atrazine, isoproturon, mecoprop, 2,4-D, and bentazone. The results demonstrate that pesticides adsorb to pure mineral surfaces. However, the size of the adsorption depends on the type of pesticide and the type of mineral....

  3. Mineral resource of the month: vermiculite

    Science.gov (United States)

    Tanner, Arnold O.

    2014-01-01

    Vermiculite comprises a group of hydrated, laminar magnesium-aluminum-iron silicate minerals resembling mica. They are secondary minerals, typically altered biotite, iron-rich phlogopite or other micas or clay-like minerals that are themselves sometimes alteration products of amphibole, chlorite, olivine and pyroxene. Vermiculite deposits are associated with volcanic ultramafic rocks rich in magnesium silicate minerals, and flakes of the mineral range in color from black to shades of brown and yellow. The crystal structure of vermiculite contains water molecules, a property that is critical to its processing for common uses.

  4. Quantitative Prediction for Deep Mineral Exploration

    Institute of Scientific and Technical Information of China (English)

    Zhao Pengda; Cheng Qiuming; Xia Qinglin

    2008-01-01

    On reviewing the characteristics of deep mineral exploration, this article elaborates on the necessity of employing quantitative prediction to reduce uncertainty. This is caused by complexity of mineral deposit formational environments and mineralization systems as increase of exploration depth and incompleteness of geo-information from limited direct observation. The authors wish to share the idea of "seeking difference" principle in addition to the "similar analogy" principle in deep mineral exploration, especially the focus is on the new ores in depth either in an area with discovered shallow mineral deposits or in new areas where there are no sufficient mineral deposit models to be compared. An on-going research project, involving Sn and Cu mineral deposit quantitative prediction in the Gejiu (个旧) area of Yunnan (云南) Province, China, was briefly introduced to demonstrate how the "three-component" (geoanomaly-mineralization diversity-mineral deposit spectrum) theory and non-linear methods series in conjunction with advanced GIS technology, can be applied in multi-scale and multi-task deep mineral prospecting and quantitative mineral resource assessment.

  5. The mineralization processes in teleost fish scales.

    Science.gov (United States)

    Schönbörner, A A; Boivin, G; Baud, C A

    1979-11-01

    In Teleost fish scales, growth and mineralization are continuous. Different mineralization processes can be distinguished. The external layer of the scale is the first to be mineralized and may be classified as the initial calcifying structure of the scale. The initial calcification loci are matrix vesicles of cellular origin always observed during the formation of this layer. This mineralization process takes place progressively, closely following the elaboration of the organic matrix in the scale periphery. The outer limiting and internal layers of the scale are developed after the external layer has been formed. A mineral substance is deposited without the mediation of matrix vesicles, but in contact with the previously mineralized external layer. This type of mineralization is called subsequential. However, the mineralization of the outer limiting layer closely follows the secretion of a collagen-free organic matrix and is thus different from the mineralization of the internal layer in which the calcification front remains remote from the collagen matrix surface and corresponds to a delayed mineralization process. The isolated calcifications (Mandl's corpuscles) which develop in the unmineralized laminae of the internal layer are mineralized in the absence of matrix vesicles and without making contact with a pre-existing calcified tissue, probably by a heterogeneous nucleation of the collagen fibrils. PMID:519703

  6. Decorin modulates matrix mineralization in vitro

    Science.gov (United States)

    Mochida, Yoshiyuki; Duarte, Wagner R.; Tanzawa, Hideki; Paschalis, Eleftherios P.; Yamauchi, Mitsuo

    2003-01-01

    Decorin (DCN), a member of small leucine-rich proteoglycans, is known to modulate collagen fibrillogenesis. In order to investigate the potential roles of DCN in collagen matrix mineralization, several stable osteoblastic cell clones expressing higher (sense-DCN, S-DCN) and lower (antisense-DCN, As-DCN) levels of DCN were generated and the mineralized nodules formed by these clones were characterized. In comparison with control cells, the onset of mineralization by S-DCN clones was significantly delayed; whereas it was markedly accelerated and the number of mineralized nodules was significantly increased in As-DCN clones. The timing of mineralization was inversely correlated with the level of DCN synthesis. In these clones, the patterns of cell proliferation and differentiation appeared unaffected. These results suggest that DCN may act as an inhibitor of collagen matrix mineralization, thus modulating the timing of matrix mineralization.

  7. Mineralization of Carbon Dioxide: Literature Review

    Energy Technology Data Exchange (ETDEWEB)

    Romanov, V; Soong, Y; Carney, C; Rush, G; Nielsen, B; O' Connor, W

    2015-01-01

    CCS research has been focused on CO2 storage in geologic formations, with many potential risks. An alternative to conventional geologic storage is carbon mineralization, where CO2 is reacted with metal cations to form carbonate minerals. Mineralization methods can be broadly divided into two categories: in situ and ex situ. In situ mineralization, or mineral trapping, is a component of underground geologic sequestration, in which a portion of the injected CO2 reacts with alkaline rock present in the target formation to form solid carbonate species. In ex situ mineralization, the carbonation reaction occurs above ground, within a separate reactor or industrial process. This literature review is meant to provide an update on the current status of research on CO2 mineralization. 2

  8. El comercio exterior durante la década revolucionaria: un acercamiento preliminar

    Directory of Open Access Journals (Sweden)

    Sandra Kuntz Ficker

    2001-01-01

    Full Text Available El propósito de este trabajo es realizar un primer acercamiento sistemático al análisis del comercio exterior de México durante la década de 1910. Tal objetivo se ha visto obstaculizado en el pasado por la escasez de fuentes cuantitativas de procedencia mexicana para los años de la revolución. Para suplir esta carencia, este artículo recurre a las estadísticas comerciales publicadas por los principales socios de México durante estos años (Estados Unidos, Gran Bretaña y Francia. A partir de esta información, y con base en una amplia bibliografía secundaria acerca del periodo, se analiza la evolución general del comercio, así como el comportamiento y la composición de las importaciones y las exportaciones a lo largo del periodo.

  9. Taquicardia ventricular del tracto de salida del ventrículo derecho durante el embarazo

    Directory of Open Access Journals (Sweden)

    Ariel K. Saad

    2012-06-01

    Full Text Available Durante el embarazo aumentan el metabolismo basal, el consumo de O2, la frecuencia cardíaca, el volumen sistólico, el volumen minuto y la volemia y disminuyen la tensión arterial y la resistencia periférica. Diferentes estudios han demostrado que durante este período la posibilidad de que ocurra una arritmia cardíaca o se produzca la exacerbación de una arritmia preexistente es mayor. No obstante, en su enorme mayoría carecen de importancia pronóstica tanto para la madre como para el feto. La taquicardia ventricular del tracto de salida del ventrículo derecho es una arritmia poco frecuente y su aparición se ha correlacionado con el aumento del tono adrenérgico. Se presentan los casos de dos pacientes que mostraron en el curso de la gestación reiterados episodios de taquicardia ventricular del tracto de salida del ventrículo derecho. Se analiza la asociación del embarazo con la ocurrencia de trastornos del ritmo cardíaco.

  10. Leptin and bone mineral density

    DEFF Research Database (Denmark)

    Morberg, Cathrine M; Tetens, Inge; Black, Eva;

    2003-01-01

    Leptin has been suggested to decrease bone mineral density (BMD). This observational analysis explored the relationship between serum leptin and BMD in 327 nonobese men (controls) (body mass index 26.1 +/- 3.7 kg/m(2), age 49.9 +/- 6.0 yr) and 285 juvenile obese men (body mass index 35.9 +/- 5.9 ....../m(2), age 47.5 +/- 5.1 yr). Whole-body dual-energy x-ray absorptiometry scan measured BMD, fat mass, and lean mass. Fasting serum leptin (nanograms per milliliter) was strongly associated with fat mass (kilograms) in both controls (r = 0.876; P

  11. ROCKS & MINERALS DETERMINATION AND ANALYSIS

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    20150204 Abaydulla Alimjan(Department of Chemistry and Environmental Sciences,Kashgar Teachers College,Kashgar 844006,China);Cheng Chunying Non-Metallic Element Composition Analysis of Non-Ferrous Metal Ores from Oytagh Town,Xinjiang(Rock and Mineral Analysis,ISSN0254-5357,CN11-2131/TD,33(1),2014,p.44-50,5illus.,4tables,28refs.)Key words:nonferrous metals ore,nonmetals,chemical analysis,thermogravimetric analysis Anions in non-ferrous ore materials

  12. Skull melting of synthetic minerals

    Energy Technology Data Exchange (ETDEWEB)

    Scott, S.D.; Hull, D.E.; Herrick, C.C.

    1977-12-01

    Direct high-frequency induction melting of dielectric materials in a water-cooled cage has been developed in the LASL synthetic minerals program. Molten material is contained in a skull, i.e., sintered shell, of its own composition so the traditional problems associated with refractory melt contamination are essentially eliminated. Preliminary analyses of power input, cage design, and coil geometry are discussed. Initial experimental results on the preparation of polycrystalline ingots, single crystals, and glasses are presented along with possible applications of this technique.

  13. Ultrasound-intensified mineral carbonation

    International Nuclear Information System (INIS)

    Several aspects of ultrasound-assisted mineral carbonation were investigated in this work. The objectives were to intensify the CO2 sequestration process to improve reaction kinetics and maximal conversion. Stainless steel slags, derived from the Argon Oxygen Decarburization (AOD) and Continuous Casting/Ladle Metallurgy (CC/LM) refining steps, were used for assessing the technical feasibility of this concept, as they are potential carbon sinks and can benefit from reduction in alkalinity (pH) by mineral carbonation. Ultrasound was applied by use of an ultrasound horn into the reaction slurry, where mineral carbonation reaction took place at 50 °C for up to 4 h; comparison was made to solely mechanically mixed process. It was found that sonication increases the reaction rate after the initial stage, and permits achieving higher carbonate conversion and lower pH. AOD slag conversion increased from 30% to 49%, and pH decreased from 10.6 to 10.1; CC slag conversion increased from 61% to 73% and pH decreased from 10.8 to 9.9. The enhancement effect of ultrasound was attributed to the removal of passivating layers (precipitated calcium carbonate and depleted silica) that surround the unreacted particle core and inhibit mass transfer. Significant particle size reduction was observed for sonicated powders, compared to particle size growth in the case of stirring-only; D[4,3] values increased without sonication by 74% and 50%, and decreased with sonication by 64% and 52%, respectively for AOD and CC slags. Considerations on scale-up of this technology, particularly with regards to energy efficiency, are also discussed. Highlights: ► Ultrasound increased CaO, AOD and CC slags mineral carbonation rates and conversions. ► Enhancement effect linked to removal of mass transfer inhibiting passivating layers. ►Carbonated particle size grew with stirring-only, and decreased with sonication. ► Lower pH of slags with greater carbonation extent can reduce heavy metal leaching

  14. Comparación de cianuro y tiourea como agentes lixiviantes de un mineral aurífero colombiano

    Directory of Open Access Journals (Sweden)

    José Isaí Santamaría Roncancio

    2013-12-01

    Full Text Available Estudio preliminar de la lixiviación del oro a partir de un mineral aurífero procedente de Marmato (Caldas; como agentes lixiviantes se emplearon tiourea y cianuro sódico. El estudio se desarrolló en tres etapas: 1 caracterización del mineral mediante Difracción de Rayos X (DRX, Ensayo al Fuego y cuantificación de oro por Absorción Atómica (AA; 2 realización de lixiviaciones con los agentes a muestras minerales de 100 g, durante 8 horas, con una agitación de 800 rpm y temperatura ambiente, tomando muestras de solución a intervalos controlados de tiempo, y 3 análisis de rendimientos de extracción de oro. Las lixiviaciones con tiourea arrojaron mayor rendimiento que las de cianuro.

  15. Mineral Resource Information System for Field Lab in the Osage Mineral Reservation Estate

    Energy Technology Data Exchange (ETDEWEB)

    Carroll, H.B.; Johnson, William I.

    1999-04-27

    The Osage Mineral Reservation Estate is located in Osage County, Oklahoma. Minerals on the Estate are owned by members of the Osage Tribe who are shareholders in the Estate. The Estate is administered by the Osage Agency, Branch of Minerals, operated by the U.S. Bureau of Indian Affairs (BIA). Oil, natural gas, casinghead gas, and other minerals (sand, gravel, limestone, and dolomite) are exploited by lessors. Operators may obtain from the Branch of Minerals and the Osage Mineral Estate Tribal Council leases to explore and exploit oil, gas, oil and gas, and other minerals on the Estate. Operators pay a royalty on all minerals exploited and sold from the Estate. A mineral Resource Information system was developed for this project to evaluate the remaining hydrocarbon resources located on the Estate. Databases on Microsoft Excel spreadsheets of operators, leases, and production were designed for use in conjunction with an evaluation spreadsheet for estimating the remaining hydrocarbons on the Estate.

  16. Azoto junginių dinamika skirtinguose šachtinių šulinių vandens gyliuose

    OpenAIRE

    Tiškutė, Daiva

    2006-01-01

    Research report on the dynamics of nitric compounds in different water levels of shallow wells, located in Pypliai, Kaunas District, is given in the thesis. Subject of research – water quality indicators: nitrates (NO3-), nitrites (NO2-) and ammonium (NH3). Aim of research – to define variation of nitrates concentrations in different water levels of shallow wells. Methodology: analysis of scientific literature; chemical water quality analyzes methods: spectral and electrochemical methods; sta...

  17. The nanosphere iron mineral(s) in Mars soil

    Science.gov (United States)

    Banin, A.; Ben-Shlomo, T.; Margulies, L.; Blake, D. F.; Mancinelli, R. L.; Gehring, A. U.

    1993-01-01

    A series of surface-modified clays containing nanophase (np) iron/oxyhydroxides of extremely small particle sizes, with total iron contents as high as found in Mars soil, were prepared by iron deposition on the clay surface from ferrous chloride solution. Comprehensive studies of the iron mineralogy in these 'Mars-soil analogs' were conducted using chemical extractions, solubility analyses, pH and redox, x ray and electron diffractometry, electron microscopic imaging specific surface area and particle size determinations, differential thermal analyses, magnetic properties characterization, spectral reflectance, and Viking biology simulation experiments. The clay matrix and the procedure used for synthesis produced nanophase iron oxides containing a certain proportion of divalent iron, which slowly converts to more stable, fully oxidized iron minerals. The noncrystalline nature of the iron compounds precipitated on the surface of the clay was verified by their complete extractability in oxalate. Lepidocrocite (gamma-FeOOH) was detected by selected area electron diffraction. It is formed from a double iron Fe(II)/Fe(III) hydroxyl mineral such as 'green rust', or ferrosic hydroxide. Magnetic measurements suggested that lepidocrocite converted to the more stable meaghemite (gamma-Fe203) by mild heat treatment and then to nanophase hematite (aplha-Fe203) by extensive heat treatment. Their chemical reactivity offers a plausible mechanism for the somewhat puzzling observations of the Viking biology experiments. Their unique chemical reactivities are attributed to the combined catalytic effects of the iron oxide/oxyhydroxide and silicate phase surfaces. The mode of formation of these (nanophase) iron oxides on Mars is still unknown.

  18. Ruralia, tradicionalismo y población en la puna de Jujuy durante el siglo XX

    Directory of Open Access Journals (Sweden)

    Alfredo Bolsi

    2005-01-01

    Full Text Available The growth of the population puneña during century XX is from the evolution of three central circumstances. First, it consists of which the society puneña, specially the rural one, has been, and largely it is it, ";a traditional"; society, that is to say, nonmodern, preindustrial, with social structure little differentiated, cultural guidelines differentials. The other is related to the process of joint between that traditional society and modern, the capitalist one, extra-puneña. The conjecture is that the consolidation of Capitalism in the Argentine Northwest from the last third of century XIX did not move nor replaced the traditional society: it coexisted with her during decades generating substantial changes in numerous aspects. Third it has to do with the action of the State: during the first decades of the XX it operated at least in the context of the positivismo, associated with the concept of development - nondistant to the one of progress. Through the progress, the traditional society transforms itself into a rational, secular society, with differentiated social structures.El crecimiento de la población puneña durante el siglo XX resulta de la evolución de tres circunstancias centrales. La primera consiste en que la sociedad puneña, especialmente la rural, ha sido, y en buena medida lo es, una sociedad "tradicional", es decir, no moderna, preindustrial, con estructura social poco diferenciada, con pautas culturales diferenciales. La otra se relaciona con el proceso de articulación entre esa sociedad tradicional y la moderna, capitalista, extra-puneña. La conjetura es que la consolidación del capitalismo en el Noroeste argentino a partir del último tercio del siglo XIX no desplazó ni reemplazó a la sociedad tradicional: convivió con ella durante décadas generando cambios sustanciales en numerosos aspectos. La tercera tiene que ver con la acción del Estado: al menos durante las primeras décadas del XX operó en el

  19. COMPARTIMENTACIÓN INTERCELULAR DEL ACETATO EN NEURONAS Y ASTROCITOS DURANTE LA PRELACTANCIA

    Directory of Open Access Journals (Sweden)

    J. Tovar-Franco

    2005-12-01

    Full Text Available Durante el período perinatal el cerebro utiliza sustratos alternativos a la glucosa para mantener su desarrollo, pues en este momento sus niveles están disminuidos. El acetato es metabolizado por las neuronas y los astrocitos durante la prelactancia. La utilización del acetato por estas células puede verse mejorada por lasreacciones fijadoras de CO2, algunas de las cuales participan en el mantenimiento de los intermediarios del TCA, que son reducidos por la producción y liberación de aminoácidos, suministrando los recursos para la producción de energía y sustratos que son compartimentados intercelularmente.Se estudió el efecto de la fijación de CO2 en procesos metabólicos intercelulares donde está involucrado el acetato. En incubaciones con neuronas y astrocitos de 7 y 14 días de cultivo, utilizando acetato (5 mM y [14C]-bicarbonato de sodio (10 µ Ci (500-1000 dpm/nmol, se determinó la incorporación en metabolitos marcados en células y en sustratos estables liberados al medio. Adicionalmente, se realizaron experimentos similares utilizando inhibidores como el aminooxiacetato (AOA, dicloroacetato (DCA, α-ciano-4-hidroxicinnamato (α-CN, butilmalonato (BM y bencenotricarboxílato (BT, cuantificando porcromatografía de capa delgada la concentración en el medio de incubación de alanina, aspartato, glutamato y glutamina.Los resultados indican que las neuronas tienen una menor capacidad para fijar carbonos en estructuras celulares, durante la prelactancia, pero utilizan mejor el acetato vía acetil-CoA mitocondrial (AceCS2 para la producción de energía y aminoácidos. En los astrocitos, estas reacciones favorecen la utilización del acetato vía citrato liasa y Acetil-CoA citosólica (AceCS1 para la producción de estructuras y sustratos utilizados por las neuronas, que para la producción de aminoácidos.

  20. Reposição de nutrientes durante três cultivos de alface em hidroponia

    Directory of Open Access Journals (Sweden)

    Backes Fernanda Alice A.L.

    2003-01-01

    Full Text Available O experimento foi realizado em estufa plástica na UFSM, de agosto a novembro/99. Avaliou-se cinco formas de reposição de nutrientes na solução nutritiva com base na condutividade elétrica (CE, no sistema 'NFT' (Nutrient Film Technique e duas cultivares de alface: Regina e Deisy, cultivadas em bancadas de sustentação formadas por telhas de fibro-cimento revestidas com tinta betuminosa Neutrolâ. Foram dispostas 14 plantas por canal para cada repetição e uma cultivar em cada três canais, totalizando 84 plantas por bancada de produção. Comparou-se a eficiência de métodos de reposição de nutrientes na produção de alface, assim como a utilização da mesma solução, com reposição de nutrientes, durante três cultivos consecutivos. O delineamento experimental foi de blocos casualizados, com três repetições, em esquema fatorial 5x2. Os resultados demonstraram que o desempenho das cultivares avaliadas não foi influenciado pelos métodos de reposição de nutrientes. A ausência de reposição de nutrientes na solução nutritiva, durante um cultivo, permitiu maior produtividade da cultura, não se recomendando a reposição quando o objetivo for renovar a solução ao final do cultivo. As formas de reposição de nutrientes na solução nutritiva, durante o primeiro e segundo cultivos, não alteraram a produtividade da cultura em relação à renovação completa da solução nutritiva ao final do cultivo hidropônico. Para a reutilização de solução nutritiva, recomenda-se a reposição de nutrientes sempre que a CE diminuir 50% da inicial, possibilitando a produção por pelo menos três cultivos.

  1. Fútbol y conflictividad sociopolítica durante la dictadura de Franco. Un estudio de caso

    Directory of Open Access Journals (Sweden)

    Néstor García Lázaro

    2014-02-01

    Full Text Available El objetivo de la presente investigación es ahondar la relación existente entre el fútbol y la conflictividadsociopolítica durante los períodos de dictadura. Para ello nos centramos en estudiar los desórdenespúblicos que tienen lugar durante y después del encuentro que enfrenta a la Unión Deportiva LasPalmas contra el Córdoba en el Estadio Insular el 4 de marzo de 1962. Nos basamos principalmenteen la documentación generada por las autoridades franquistas, como es el caso del Servicio de Informaciónde la Guardia Civil, la Dirección General de Seguridad y el Gobernador Civil de Las Palmas;la prensa oficial de la época y la de las organizaciones antifranquistas. Explicamos este conflicto comofruto de las condiciones económicas, sociales y políticas que se viven durante los años anteriores enla ciudad de Las Palmas de Gran Canaria, que generan un gran descontento entre todas las clases socialescon la dictadura imperante. De esta investigación se desprende el cariz nacionalista del conflictoy la importancia que el mismo tuvo para las autoridades franquistas, que emprendieron una serie deacciones para mejorar la situación de las islas.The aim of this research is to deepen the relationship between football and socio-political conflictduring periods of dictatorship. For this study we focus on public disorder occurring during and afterthe match pitting the Union Deportiva Las Palmas against Córdoba at Estadio Insular March 4, 1962.To do this we rely primarily on the documentation generated by the Francoist authorities, such as theInformation Service of the Civil Guard, the Dirección General de Seguridad and the Civil Governorof Las Palmas; the official press of the time and the propaganda of the anti-Franco organizations. Weexplain this conflict as a result of the economic, social and political conditions that is lived in the yearsbefore on the city of Las Palmas de Gran Canaria, that generate a lot of discontent among all

  2. Defective skeletal mineralization in pediatric CKD.

    Science.gov (United States)

    Wesseling-Perry, Katherine

    2015-04-01

    Although traditional diagnosis and treatment of renal osteodystrophy focused on changes in bone turnover, current data demonstrate that abnormalities in skeletal mineralization are also prevalent in pediatric chronic kidney disease (CKD) and likely contribute to skeletal morbidities that continue to plague this population. It is now clear that alterations in osteocyte biology, manifested by changes in osteocytic protein expression, occur in early CKD before abnormalities in traditional measures of mineral metabolism are apparent and may contribute to defective skeletal mineralization. Current treatment paradigms advocate the use of 1,25(OH)2vitamin D for the control of secondary hyperparathyroidism; however, these agents fail to correct defective skeletal mineralization and may exacerbate already altered osteocyte biology. Further studies are critically needed to identify the initial trigger for abnormalities of skeletal mineralization as well as the potential effects that current therapeutic options may have on osteocyte biology and bone mineralization.

  3. Calculation of topological connectivity index for minerals

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Topological method was applied firstly to calculate the topological connectivity index of minerals (TCIM). The reciprocal of effective atomic refractivity of metal dement in minerals was chosen as its valence. The reasonability of TCIM as an activity criterion was tested through comparison of TCIM with two kinds of dectronegativity parameter, i.e. ionic percentage and energy criteria of Yang's electronegativity, solubility product, energy criterion according to the gen eralized perturbation theory and adsorption of flotation reagents on the surface of minerals. The results indicated that TCIM is an effective structural parameter of minerals to study the structure-activity relationship. In addition, different mineral is of different TCIM value, so TCIM brings about convenience in comparison of flotation activity for minerals.

  4. Mining and minerals policy: 1976 bicentennial edition

    Energy Technology Data Exchange (ETDEWEB)

    1976-07-01

    The report is organized into three basic parts. The first part, the Executive Summary, provides a brief description of the major topics and lists the issues and recommendations. The report then is divided into two sections. Section I, Summary, is comprised of three chapters: Increased Energy Security; Metals and Nonmetallic Minerals; and Trends and Events. Section II, Issues in Energy and Minerals Policy, is comprised of seven chapters: Federal Leasing; The Federal Role in Reducing the Fiscal Impacts of Energy Development; Availability of Federal Lands for Mineral Exploration and Development; Environmental Issues and the Mineral Industry; Developments in International Minerals Trade and Investment; Ocean Mining; and The Development of New Tools for Energy and Minerals Policy Analysis. (MCW)

  5. Genetic Types of Diamond Mineralization

    Institute of Scientific and Technical Information of China (English)

    A.A.MARAKUSHEV; 桑隆康; 等

    1998-01-01

    The paper describes the proposed models of diamond formation both in meteorites and in kimberlite and lamproite bodies.metamorphic complexes and explosive-ring structures ("astroblemes"),The diamond distribution in meteorites(chondrites,iron meteorites and ureilites)is restricted to taente-kamasite phase.The diamond generation here is tied up with the first stage of evolution of the planets,This stage is characterized by high pressure of hydrogen. leading to the formation of the planet envelope,The second stage of planet evolution began with the progressive imopoverishment of their atmospheres in hydrogen due to its predominant emission into the space and to progressive development of oxidative conditions.The model appears to have proved the relict nature of diamond mineraolization in meteorites.Diamond and other high-pressure minerals(its"satellites") were crystallized without any exception in the early intratelluric stages of peridotite and eclogite-pyroxenite magma evolution just before the magma intrusion into the higher levels of the mantle and crust where diamond is not thermodynamically stable,The ultramafic intrusive bodies(bearing rich relict diamonds)in the dase of a platform paaear to be the substrata for the formation of kimberlite-lamproite magma chambers as a result of magmatic replacement.The model explains the polyfacial nature of diamondiferous eclotgites,pyroxenites and peridotites and discusses the process of inheritance of their diamond mineralization by kimberlites and lamproites.Dimond oproductivity of metamorthic complexes is originated by the inheritance of their diamonds from the above-mentioned primary diamondiferous rocks.Large diamondiferous explosive-ring structures were formed by high-energy endogenic explosion of fluid which came from the Earth's core.This high energy differs endogenic impactogenesis from explosive volcanism.It proceeds at very high temperature to create diaplectic galsses(monomineral pseudomorphs)-the product of

  6. Needs and opportunities in mineral evolution research

    OpenAIRE

    Hazen, R. M.; Bekker, A.; Bish, D. L.; Bleeker, W.; Downs, R. T.; Farquhar, J.; Ferry, J. M.; Grew, E. S.; Knoll, Andrew Herbert; Papineau, D.; Ralph, J. P.; Sverjensky, D. A.; Valley, J. W.

    2011-01-01

    Progress in understanding mineral evolution, Earth’s changing near-surface mineralogy through time, depends on the availability of detailed information on mineral localities of known ages and geologic settings. A comprehensive database including this information, employing the mindat.org web site as a platform, is now being implemented. This resource will incorporate software to correlate a range of mineral occurrences and properties vs. time, and it will thus facilitate studies of the chang-...

  7. Clay minerals and sedimentary basin history

    OpenAIRE

    Merriman, Richard J.

    2005-01-01

    Clay minerals in the mud and soil that coat the Earth's surface are part of a clay cycle that breaks down and creates rock in the crust. Clays generated by surface weathering and shallow diagenetic processes are transformed into mature clay mineral assemblages in the mudrocks found in sedimentary basins. During metamorphism, the release of alkali elements and boron from clay minerals generates magmas that are subsequently weathered and recycled, representing the magma-to-mud pathway of the cl...

  8. Natural radionuclides in mineral fertilizers and farmland

    OpenAIRE

    Mitrović Branislava M.; Vitorović Gordana; Andrić Velibor; Stojanović Mirjana; Vitorović Duško; Grdović Svetlana; Vićentijević Mihajlo

    2013-01-01

    Contemporary agriculture production is based on use of mineral fertilizers, which however can have high activity of natural radionuclides and so cause the appearance of technologically elevated radioactivity. In order to determine the influence of mineral fertilizers application in arable land, there was used gamma spectrometric method for defining the activity of natural radionuclides (40 K, 238U, 226Ra) in imported mineral fertilizers as well as in arable...

  9. World mineral production 2003-2007

    OpenAIRE

    Brown, Teresa; Hetherington, Linda; Hannis, Sarah; Bide, Tom; Benham, Antony John; Idoine, Naomi; Lusty, Paul

    2009-01-01

    World Mineral Production includes five year tables of production, by country, for the majority of economically important mineral commodities, including ferrous and non-ferrous metals, industrial minerals and hydrocarbons. Additional information has been added describing the characteristics, uses production trends, prices and industry events for 11 commodities including bauxite/alumina/aluminium, coal, copper, fluorspar, gold, iron ore, lead, nickel, platinum, uranium and zinc.

  10. Inter-species variation in bone mineral

    OpenAIRE

    Beckett, Sophie

    2011-01-01

    Bone is a complex heterogeneous composite material with organic and inorganic components. The inorganic component; bone mineral, is a poorly crystalline, non-stoichiometric form of calcium hydroxylapatite. A model for the general structure and composition of bone mineral has been established within the literature. However, the nature and extent of variation in bone mineral composition and structure has, to date, been poorly understood. This situation also applies to the general response of bo...

  11. Mineral distributions at the developing tendon enthesis.

    Directory of Open Access Journals (Sweden)

    Andrea G Schwartz

    Full Text Available Tendon attaches to bone across a functionally graded interface, "the enthesis". A gradient of mineral content is believed to play an important role for dissipation of stress concentrations at mature fibrocartilaginous interfaces. Surgical repair of injured tendon to bone often fails, suggesting that the enthesis does not regenerate in a healing setting. Understanding the development and the micro/nano-meter structure of this unique interface may provide novel insights for the improvement of repair strategies. This study monitored the development of transitional tissue at the murine supraspinatus tendon enthesis, which begins postnatally and is completed by postnatal day 28. The micrometer-scale distribution of mineral across the developing enthesis was studied by X-ray micro-computed tomography and Raman microprobe spectroscopy. Analyzed regions were identified and further studied by histomorphometry. The nanometer-scale distribution of mineral and collagen fibrils at the developing interface was studied using transmission electron microscopy (TEM. A zone (∼20 µm exhibiting a gradient in mineral relative to collagen was detected at the leading edge of the hard-soft tissue interface as early as postnatal day 7. Nanocharacterization by TEM suggested that this mineral gradient arose from intrinsic surface roughness on the scale of tens of nanometers at the mineralized front. Microcomputed tomography measurements indicated increases in bone mineral density with time. Raman spectroscopy measurements revealed that the mineral-to-collagen ratio on the mineralized side of the interface was constant throughout postnatal development. An increase in the carbonate concentration of the apatite mineral phase over time suggested possible matrix remodeling during postnatal development. Comparison of Raman-based observations of localized mineral content with histomorphological features indicated that development of the graded mineralized interface is linked

  12. Role of minerals in animal health disorders

    Directory of Open Access Journals (Sweden)

    Sinovec Zlatan J.

    2005-01-01

    Full Text Available All mineral matter, essential or non-essential, can have a significant influence on production results and the health of animals, if large quantities of them are present in a feed ration. A maximally tolerant content depends on the animal specie and category. Many factors, such as physiological status (growth, lactation, etc., nutritive status, content and ratio of nutritive matter in the ration, duration of exposure, and the biological level of utilization of elements, also affect the maximally tolerant content of mineral matter in feed. The content of certain mineral matter in plant feed significantly depends on the soil factor, as well as the content and level of utilization of mineral matter from the soil. Mn, Se and Mo can be present in plant feed in such quantities as to induce toxicosis. Industrial contaminants, Cd, Pb or F, can contaminate plants, in particular their leaves, in quantities which lead to the appearance of clinical signs of conventional toxicosis. Moreover, natural water can contain large quantities of S, F, Na, Mg, or Fe, and certain mineral matter can get into water through industrial waste. In addition to the above, it is possible to cause unwanted effects through the frequent, but primarily unprofessional use of mineral additives, since it is extremely important, besides meeting the mineral requirements of each individual element, to secure a ratio among the mineral matter themselves as well as with other nutritive matter. Mineral matter present in food are in mutual interference, and these relations can be synergistic or antagonistic. The sufficiency of a large number of mineral matter has a negative effect on the utilization of other matter (conditional and/or border deficiency, while certain elements cause the clinical appearance of toxic effects. The accidental intake of large quantities of certain mineral matter is revealed as clinical signs of acute toxicosis, which is very different from chronic effects caused by

  13. Carbon dioxide sequestration by mineral carbonation

    OpenAIRE

    Huijgen, W.J.J.

    2007-01-01

    The increasing atmospheric carbon dioxide (CO2) concentration, mainly caused by fossil fuel combustion, has lead to concerns about global warming. A possible technology that can contribute to the reduction of carbon dioxide emissions is CO2 sequestration by mineral carbonation. The basic concept behind mineral CO2 sequestration is the mimicking of natural weathering processes in which calcium or magnesium containing minerals react with gaseous CO2 and form solid calcium or magnesium carbonate...

  14. DESHIDRATACION Y SOBREHIDRATACION VOLUNTARIAS DURANTE EL EJERCICIO EN EL CALOR: POSIBLES FACTORES RELACIONADOS

    Directory of Open Access Journals (Sweden)

    Andrea Solera Herrera

    2006-12-01

    Full Text Available Los efectos negativos de la deshidratación sobre la salud y el rendimiento han sido bien documentados. Recientemente, también se han documentado problemas por sobrehidratación. La presente investigación se hizo para estudiar los posibles factores que influyen sobre la ingesta voluntaria de líquido durante el ejercicio y determinar si existe relación entre el grado de deshidratación voluntaria y la creencia de que la ingesta de líquido provoca cólico. Para ello, se contó con 94 estudiantes universitarios jóvenes, varones, quienes se ejercitaron a un 60% de su FCmáx durante una hora, alternando cada 10 min. entre bicicleta estacionaria, subir y bajar un escalón, y una máquina simuladora de esquí. Esto se realizó en un laboratorio de ambiente controlado a 30úC, 70% humedad relativa. Durante el ejercicio se midió la ingesta voluntaria de una bebida deportiva, así como también las percepciones de calor ambiental, llenura estomacal, malestar gastrointestinal y palatabilidad de la bebida. Los sujetos fueron pesados desnudos y secos antes y después del ejercicio. Al final se les aplicó un cuestionario sobre la importancia de la hidratación, y sus creencias sobre el cólico. El equilibrio hídrico promedio fue de 0.14 ± 0.98% del peso corporal, con un rango entre -2.38% y 2.84%. La tasa de sudoración promedio fue de 1208.3 ± 381.7ml·h-1; y la ingesta de 1132 ± 610ml·h-1. Dos análisis de regresión múltiple determinaron que: (a los predictores más fuertes de la ingesta voluntaria de líquido fueron la importancia asignada a la hidratación durante el ejercicio (R2 = 0.13; p < 0.0005 y la percepción de llenura estomacal al minuto 25 (R2 = 0.08; p = 0.005; (b los predictores más fuertes del equilibrio hídrico fueron la ingesta voluntaria por kg de peso (R2 = 0.73; p < 0.0005, y la tasa de sudoración (R2 = 0.08; p = 0.006. No obstante, el equilibrio hídrico no estuvo asociado con ninguna de las percepciones, ni con las

  15. La visión ilustrada de los desastres naturales en Lima durante el siglo XVIII

    Directory of Open Access Journals (Sweden)

    Carlos Guillermo Carcelén Reluz

    2011-01-01

    Full Text Available Durante el siglo XVIII, Perú fue afectado por una serie de desastres naturales y epidemias que mermaron tanto la población como la producción agrícola. El artículo analiza tres casos: el período recurrente de frío extremo en los meses de invierno desde 1714 hasta 1720, que posibilitó una gran epidemia que asoló el sur de los Andes; el terremoto de 1746 en Lima, que marcó un hito en la sociedad, debido a la magnitud de su destrucción, y el fenómeno de 'el niño' (o ENSO de 1791 a 1794, uno de los que más daños generó, sobretodo en la costa norte del país.

  16. Assistolia durante ecocardiograma de estresse com dobutamina Cardiac asystole during dobutamine stress echocardiography

    Directory of Open Access Journals (Sweden)

    Rita Pinton

    1998-06-01

    Full Text Available Caso de assistolia, durante a realização de ecocardiografia de estresse com dobutamina, em mulher de 59 anos, com queixa de dor precordial. A complicação não foi associada com isquemia miocárdica e deve ter sido causada pela estimulação dos receptores cárdio-inibidores cardíacos à ação da dobutamina. A assistolia cardíaca foi revertida após administração de atropina, sem seqüelas.We report a case of cardiac asystole during dobutamine stress echocardiography in a 59 year-old woman presenting with chest pain and a positive treadmill test for ischemia. Cardiac asystole was not associated with myocardial ischaemia and was probably related to a powerful cardioinhibitory reflex caused by dobutamine stimulation.

  17. La visión ilustrada de los desastres naturales en Lima durante el siglo XVIII

    Directory of Open Access Journals (Sweden)

    Carcelén Reluz Carlos Guillermo

    2011-07-01

    Full Text Available Durante el siglo XVIII, Perú fue afectado por una serie de desastres naturales y epidemias que mermaron tanto la población como la producción agrícola. El artículo analiza tres casos: el período recurrente de frío extremo en los meses de invierno desde 1714 hasta 1720, que posibilitó una gran epidemia que asoló el sur de los Andes; el terremoto de 1746 en Lima, que marcó un hito en la sociedad, debido a la magnitud de su destrucción, y el fenómeno de ‘el niño’ (o ENSO de 1791 a 1794, uno de los que más daños generó, sobretodo en la costa norte del país.

  18. Tabaquismo durante el embarazo en Argentina y Uruguay Smoking during pregnancy in Argentina and Uruguay

    Directory of Open Access Journals (Sweden)

    Fernando Althabe

    2008-02-01

    Full Text Available Argentina y Uruguay están entre los países con mayor proporción de mujeres jóvenes fumadoras. Se desconoce cuál es la proporción exacta de ellas que fuman durante el embarazo así como las características de las que dejan de fumar y las que continúan fumando durante el embarazo. Realizamos una encuesta administrada por un/a entrevistador/a a 1512 mujeres embarazadas de 18 años o mayores (796 en Argentina; 716 en Uruguay, que concurrían a control prenatal en hospitales públicos de grandes conglomerados urbanos. 44% de las mujeres en Argentina y 53% en Uruguay habían sido o eran fumadoras. Durante el embarazo, 11% de las mujeres en Argentina y 18% en Uruguay continuaron fumando. En ambos países, la proporción de mujeres que vive con fumadores, permite fumar en el hogar y regularmente o siempre se encuentra en lugares cerrados con personas que estén fumando fue 49%, 46% y 20% entre las mujeres que nunca fumaron, 67%, 60% y 32% entre las que dejaron, y 78%, 75% y 52% entre las que continuaron fumando respectivamente. El estudio confirma un importante problema de salud pública y documenta que la exposición ambiental persiste en subgrupos de mujeres, aun en aquéllas que dejaron de fumar. Es importante que el sector de salud pública provea acceso a programas efectivos para dejar de fumar durante el embarazo. Cualquier nueva intervención a desarrollar que intente tener un éxito al menos moderado y sostenible, debiera incluir componentes que actúen sobre el entorno fumador de la mujer embarazada que fuma.Argentina and Uruguay are among the countries in which a large proportion of young women smoke. The rate of smokers during pregnancy in both countries is not well known, and data on the characteristics of women who quit smoking during pregnancy compared to those who continue smoking are not available. We conducted a survey including 1512 pregnant women >18 years old (796 in Argentina; 716 in Uruguay, during antenatal visits in

  19. Informe sobre la actividad ballenera española durante la temporada de 1984

    OpenAIRE

    Quiroga, H. (Héctor); Alonso, M.; Lens, S.

    1985-01-01

    El objetivo del presente informe es la presentación de los datos estadísticos y biológicos correspondientes a l a actividad ballenera española durante la pasada campaña de 1984. En dicho año solo se mantuvo abierta la factoría de Caneliñas (La Coruña) por lo que todos los datos que se exponen fueron - registrados en dicha factoría ballenera . La actividad ballenera se inició el 24 de junio y finalizó el 29 de octubre, habiéndose capturado y procesado 102 rorcuales comunes, B...

  20. Informe sobre la actividad ballenera española durante la temporada de 1983

    OpenAIRE

    Lens, S.; Quiroga, H. (Héctor); Alonso, M.

    1984-01-01

    En el presente informe se recogen los datos obtenidos en las factorías balleneras de Balea (Pontevedra) y Caneliñas (La Coruña) durante la campaña de caza de ballenas del año 1983. El total de rorculaes comunes, Balaenoptera physalus L., procesadas ha sido de 120 hasta completar la cuota concedida por la Comisión Ballenera Internacional a España para el año 1983. La actividad ballenera se inició el dia 1 de junio y termin6 el 26 de octubre del lrls110 año. Al igual que en el...

  1. Mediadors d'apoptosi durant la preservació d'òrgans

    OpenAIRE

    Genescà i Ferrer, Meritxell

    2004-01-01

    [cat] L'objectiu general d'aquesta tesi ha sigut caracteritzar el paper de determinades molècules en relació a l'apoptosi durant la preservació d'òrgans, per poder modificar-la farmacològicament i predir-la. La isquèmia provoca una sèrie d'alteracions que poden conduir a la mort cel·lular, que pot ser tant per necrosi com per apoptosi. Recentment, l'apoptosi està prenent importància en el trasplantament d'òrgans, ja que la presència d'aquesta s'ha relacionat amb la integritat i la viabilitat...

  2. Respostas cardiovasculares durante avaliação muscular isocinética em claudicantes

    OpenAIRE

    Lucas Caseri Câmara; Raphael Mendes Ritti-Dias; Claudia Lúcia de Moraes Forjaz; Júlia Maria Greve; José Maria Santarém; Wilson Jacob-Filho; Pedro Puech-Leão; Nelson Wolosker

    2010-01-01

    FUNDAMENTO: A dinamometria isocinética tem tido crescente importância para avaliação da função muscular em indivíduos com claudicação intermitente. No entanto, ainda há escassez de informações sobre as respostas cardiovasculares desses doentes durante este tipo de avaliação. OBJETIVO: Avaliar e comparar as respostas cardiovasculares na avaliação da força e resistência muscular de dois exercícios comumente utilizados para de pacientes com CI (flexão plantar/dorsiflexão e flexão/extensão de joe...

  3. La política exterior colombiana durante la Segunda Guerra Mundial

    OpenAIRE

    Mesa Valencia, Andrés Felipe

    2014-01-01

    resumen: El presente estudio se refiere a la política exterior de Colombia durante la Segunda Guerra Mundial. Se estructura en el tiempo de duración del conflicto, es decir, entre 1939 y 1945, y por tanto, es una indagación respecto a las medidas políticas y de seguridad que adoptó la nación con ocasión de la conflagración. ¿Por qué el gobierno colombiano optó por apoyar la causa de las democracias? ¿Acaso fue una estrategia para ganarse el favor de los Estados Unidos, o simplemente no pudo t...

  4. Algunas consideraciones sobre el mercado laboral en España durante la crisis

    OpenAIRE

    Fernández Bernal, Juan Diego

    2015-01-01

    Este trabajo tiene como objetivo estudiar algunos aspectos de un hecho que hoy en día está en la cabeza de todos y es un gran problema para muchas personas, la situación del mercado laboral durante la reciente crisis económica. Atendiendo a la noticia aparecida el pasado día 5 de diciembre de 2014 en El País [1] y siguiendo a OIT (2015) [2], “La concentración del aumento del desempleo en las rentas más bajas ha convertido a España en el país entre las economías desarrolladas donde más ha aume...

  5. Los destinos de las exportaciones y la neutralidad argentina durante la Primera Guerra Mundial

    Directory of Open Access Journals (Sweden)

    Agustina Rayes

    2014-01-01

    Full Text Available Este artículo fundamenta que la distribución geográfica prebélica de las exportaciones fue uno de los principales motivos que explican la neutralidad de la Argentina durante la Primera Guerra Mundial. Para sostener nuestra hipótesis presentamos nueva evidencia empírica basada tanto en la corrección de precios de los artículos como en la distribución de los embarques “a órdenes”. Adicionalmente, caracterizamos las exportaciones argentinas a lo largo de la contienda considerando la composición de la canasta, los valores y el volumen de los productos y su distribución geográfica, para mostrar la dificultad de mantener la neutralidad en las relaciones comerciales argentinas de la época.

  6. Deshidratación de banano y cambio químicos ocurridos durante el proceso

    Directory of Open Access Journals (Sweden)

    C. Reyes de

    2009-07-01

    Full Text Available Como el banano es una fruta muy alterable, es necesario transformarlaa estados más estables para prolongar su conservación.Uno de los procesos más sencillos y fáciles de realizar es la deshidratación; en nuestro país ya se efectúa pero necesita una tecnificación y un estudio químico a fondo sobre los cambios ocurridosa los diferentes constituyentes de la pulpa de banano.En este trabajo se buscaron las condiciones óptimas en lascuales podría realizarse la deshidratación del banano, para que lapérdida de nutrientes fuera mínima, y se evaluaron los cambiosquímicos ocurridos durante dicho proceso.

  7. Shock waves data for minerals

    Science.gov (United States)

    Ahrens, Thomas J.; Johnson, Mary L.

    1994-01-01

    Shock compression of the materials of planetary interiors yields data which upon comparison with density-pressure and density-sound velocity profiles constrain internal composition and temperature. Other important applications of shock wave data and related properties are found in the impact mechanics of terrestrial planets and solid satellites. Shock wave equation of state, shock-induced dynamic yielding and phase transitions, and shock temperature are discussed. In regions where a substantial phase change in the material does not occur, the relationship between the particle velocity, U(sub p), and the shock velocity, U(sub s), is given by U(sub s) = C(sub 0) + S U(sub p), where C(sub 0) is the shock velocity at infinitesimally small particle velocity, or the ambient pressure bulk sound velocity. Numerical values for the shock wave equation of state for minerals and related materials of the solar system are provided.

  8. MINERAL NUTRIENTS AND MALE FERTILITY

    Directory of Open Access Journals (Sweden)

    Eva Tvrdá

    2013-08-01

    Full Text Available Semen is a complex mixture containing a variety of organic and inorganic compounds. While the production and functions of semen are well understood, studies focused on the macro- and micronutrients necessary for male fertility are constantly appearing with new information. Chemical elements play a crucial role in male reproduction, as an unbalance in their amounts may lead to defective spermatogenesis, reduced libido, and consequently, male fertility impairment. Dietary and feeding supplementation has the ability to increase male reproductive performance which is why the effects of minerals in diet cannot be ignored. This review will provide recent information to a better understanding of the positive as well as negative roles of selected macro- and micronutrients on male fertility.

  9. ROCKS & MINERALS DETERMINATION AND ANALYSIS

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    <正>20091570 Ge Yunjin(College of Geo-Resource and Information,China University of Petroleum,Dongying 257061,China);Chen Yong Advance in Low Temperature Phase Transition and Raman Spectrum Technique in Composition Determination of Fluid Inclusions(Rock and Mineral Analysis,ISSN0254-5357,CN11-2131/TD,27(3),2008,p.207-210,22 refs.)Key words:fluid inclusions,Raman spectraThe principle and development of low-temperature analytical techniques for fluid inclusions were expounded.The traditional low-temperature analytical technology mainly focused on the measurement of inorganic salt using congealed microthermometry,but now it is developed to semi-quantitative and quantitative analysis of fluid inclusions using in-situ cryogenic Raman spectrometry.

  10. Epidemiological studies of Czech miners

    Energy Technology Data Exchange (ETDEWEB)

    Tomasek, L. [National Radiation Protection Inst., Prague (Czech Republic)

    1995-09-01

    Lung cancer risk from radon was analysed in three cohorts of uranium (N=4320+5628) and burnt clay (N=915) miners. The follow-up of miners was extended up to 1990. Most of the cases (708) have been observed in the oldest (S) cohort followed since 1952. The other two cohorts, 18 years younger in average with substantially lower exposures, contributed 72 cases. Therefore, the main analyses of risk from radon were based on the S cohort. The data of the S cohort were subjected to checks both as for the individual exposures of the miners and the completeness of follow-up. The present mortality analyses from other causes suggest the follow-up is correct. The general patterns of mortality from violent deaths and diseases other than lung cancer show similar features in all the three cohorts, i.e. decreasing trend with time since first exposure in the first case, and increasing trend in the second one, confirming thus the healthy worker effect, in the first 20 years. A raised mortality was observed in later periods in respiratory and circulatory diseases and also in cancers other than lung cancer, suggesting that smoking habits among miners might be more frequent than in the general population. The estimates of lung cancer risk from radon exposure were based on relative linear models, where cumulative exposures were lagged by 5 years. The linear effect of cumulative exposure was substantially modified by time since exposure, exposure rate, and age at exposure. From the estimated intercept, it can be deduced that in the absence of exposure to radon, the estimated mortality from lung cancer in the cohort is about 1.5 times higher than in the general population. (orig.) [Deutsch] Das Lungenkrebsrisiko bei Radonexposition wurde in drei Kohorten an Bergleuten von Uran- und Schiefertongruben analysiert (n=4320, 5628, 9159). Das follow up der Bergleute erfolgte bis zum Jahr 1990. Die meisten Krebsfaelle (708) wurden in der aelteren S-Kohorte, dessen follow up bereits 1952 begann

  11. Mineral elements in milk and dairy products

    Directory of Open Access Journals (Sweden)

    Šimun Zamberlin

    2012-06-01

    Full Text Available Mineral elements occur in milk and dairy products as inorganic ions and salts, as well as part of organic molecules, such as proteins, fats, carbohydrates and nucleic acids. The chemical form of mineral elements is important because it determines their absorption in the intestine and their biological utilization. The mineral composition of milk is not constant because it depends on lactation phase, nutritional status of the animal, and environmental and genetic factors. The objective of this research is to point out the research results of chemical form, content and nutritional importance of individual mineral elements that are present in various milks and dairy products.

  12. TUCS/phosphate mineralization of actinides

    Energy Technology Data Exchange (ETDEWEB)

    Nash, K.L. [Argonne National Lab., IL (United States)

    1997-10-01

    This program has as its objective the development of a new technology that combines cation exchange and mineralization to reduce the concentration of heavy metals (in particular actinides) in groundwaters. The treatment regimen must be compatible with the groundwater and soil, potentially using groundwater/soil components to aid in the immobilization process. The delivery system (probably a water-soluble chelating agent) should first concentrate the radionuclides then release the precipitating anion, which forms thermodynamically stable mineral phases, either with the target metal ions alone or in combination with matrix cations. This approach should generate thermodynamically stable mineral phases resistant to weathering. The chelating agent should decompose spontaneously with time, release the mineralizing agent, and leave a residue that does not interfere with mineral formation. For the actinides, the ideal compound probably will release phosphate, as actinide phosphate mineral phases are among the least soluble species for these metals. The most promising means of delivering the precipitant would be to use a water-soluble, hydrolytically unstable complexant that functions in the initial stages as a cation exchanger to concentrate the metal ions. As it decomposes, the chelating agent releases phosphate to foster formation of crystalline mineral phases. Because it involves only the application of inexpensive reagents, the method of phosphate mineralization promises to be an economical alternative for in situ immobilization of radionuclides (actinides in particular). The method relies on the inherent (thermodynamic) stability of actinide mineral phases.

  13. Mineral Facilities of Latin America and Canada

    Science.gov (United States)

    Bernstein, Rachel; Eros, Mike; Quintana-Velazquez, Meliany

    2006-01-01

    This data set consists of records for over 900 mineral facilities in Latin America and Canada. The mineral facilities include mines, plants, smelters, or refineries of aluminum, cement, coal, copper, diamond, gold, iron and steel, nickel, platinum-group metals, salt, and silver, among others. Records include attributes such as commodity, country, location, company name, facility type and capacity if applicable, and generalized coordinates. The data were compiled from multiple sources, including the 2003 and 2004 USGS Minerals Yearbooks (Latin America and Candada volume), data to be published in the 2005 Minerals Yearbook Latin America and Canada Volume, minerals statistics and information from the USGS minerals information Web site (minerals.usgs.gov/minerals), and data collected by USGS minerals information country specialists. Data reflect the most recent published table of industry structure for each country. Other sources include statistical publications of individual countries, annual reports and press releases of operating companies,and trade journals. Due to the sensitivity of some energy commodity data, the quality of these data should be evaluated on a country-by-country basis. Additional information and explanation is available from the country specialists.

  14. Crecimiento económico de China durante la crisis financiera mundial

    Directory of Open Access Journals (Sweden)

    Pedro A. Villezca Becerra

    2015-01-01

    Full Text Available En el ámbito global, China se sigue haciendo cada vez más fuerte. La evidencia más contundente proviene de su sobresaliente desempeño económico durante los años 2008 y 2009 en el entorno de la crisis financiera mundial más grave desde la Gran Depresión de los años treinta. Aun cuando algunos de sus principales indicadores económicos muestran un crecimiento más lento durante estos años, la economía china experimentó una rápida recuperación, revirtiendo los efectos negativos de la crisis. En este contexto, el presente trabajo revisa los logros económicos y el manejo de su política económica para enfrentar la crisis e intenta explicar las razones de su éxito. El gobierno central implementó políticas fiscales y monetarias expansivas y aplicó un conjunto de incentivos económicos, a fin de impulsar la demanda interna y sostener el crecimiento económico frente a la reducción de la demanda externa. Como resultado, los aspectos fundamentales de la economía: el crecimiento económico, la producción industrial, el comercio internacional y la inversión extranjera directa, estuvieron mucho mejor que los del resto de las economías del mundo. La evidencia indica que las diferencias se deben a las características distintivas de su modelo de desarrollo, entre las que resalta el papel que juega la intervención del gobierno para implementar una economía dirigida, o guiada de mercado, en contraste con el libre mercado occidental.

  15. La Educación de la Mujer Mexicana en la prensa femenina durante el Porfiriato

    Directory of Open Access Journals (Sweden)

    Morelos Torres Aguilar

    2015-01-01

    Full Text Available El artículo es producto de una investigación sobre las publicaciones mexicanas dirigidas al público femenino durante el porfiriato, las cuales desempeñaron una importante función educativa. El principal objetivo de la investigación es analizar, comprender, comparar e interpretar las principales propuestas que aparecían en estas respecto a la educación de la mujer, a partir de los artículos editoriales o de las columnas destacadas en cada uno de los medios. La investigación ofrece un panorama que permite conocer las posturas más relevantes en el debate planteado en las revistas sobre la educación femenina. El método utilizado consistió en la revisión y análisis de la hemerografía de época, para lo cual fueron estudiadas diversas publicaciones, de las cuales se seleccionaron diez como las más representativas. Posteriormente se utilizó un marco teórico hermenéutico, el cual permitió analizar, comprender y posteriormente interpretar el proceso histórico, el discurso educativo y el contenido ideológico de los medios referidos. La investigación concluye que los contenidos educativos de las publicaciones corresponden al concepto de "educación informal"; asimismo, que existieron principalmente dos posturas antagónicas en torno a la educación de las mujeres: una conservadora, que recomendaba educarlas, y otra liberal o modernizadora, que proponía instruirlas. En este sentido, la principal hipótesis de la que se parte propone que ambas posturas trataban de determinar, por medio de la educación, el perfil que debía tener la mujer mexicana durante esa época.

  16. Nuevos datos y observaciones sobre la hacienda del concejo de Salamanca durante el tardofeudalismo

    Directory of Open Access Journals (Sweden)

    Javier INFANTE MIGUEL-MOTTA

    2009-12-01

    Full Text Available Vuelvo de nuevo sobre el fisco del concejo de Salamanca en los siglos de la Modernidad transcurridos algunos años desde la elaboración de mis tesis doctoral y de la aparición, no mucho tiempo después, del correspondiente libro. En aquella ocasión dediqué bastantes páginas a esta cuestión tal y como se planteó durante el siglo XVIII. Quizá convenga en el arranque de este trabajo recordar, siquiera sea de forma muy breve y sintética, lo más sustantivo de mi aportación de entonces. Comenzaba ocupándome con carácter general de las tres grandes líneas de acción de la monarquía borbónica sobre estos asuntos: primeramente, la reforma de la administración de los Propios y Arbitrios, llevada a cabo en el transcurso del siglo y no sólo en el reinado de Carlos III, que se saldó con una acentuada centralización de su gestión en el Consejo y en otras instancias de él dependientes así como con las consiguientes pérdidas de atribuciones al respecto por parte de los municipios; en segundo lugar, la presión fiscal sobre las rentas —y también en ocasiones sobre los mismos bienes— de los patrimonios concejiles, fundamentalmente bajo Carlos IV, motivada por la angustiosa situación de las finanzas regias durante esos años; por último, la política de repartos de tierras de los municipios en el reinado de Carlos III, sobre cuyas consecuencias aún nos queda mucho por conocer.

  17. Estudio antropológico de redes sociales de madres adolescentes durante el embarazo

    Directory of Open Access Journals (Sweden)

    Lorena Pasarin

    2009-07-01

    Full Text Available La atención de la salud incluye a diversos actores sociales, por ello en su estudio debe contemplarse el papel que adquieren los contextos socioculturales. El estudio de las redes sociales resulta conveniente para abordarlos. Este trabajo presenta una aplicación del análisis de redes sociales como complemento de abordaje metodológico al estudio de las prácticas y comportamientos relacionados con la salud de madres adolescentes durante el período prenatal. Utilizando la herramienta EgoNet, se analiza la estructura de las redes personales identificando redes integradas principalmente por familiares que brindan consejos y prestan ayuda instrumental, actuando como facilitadoras respecto a la realización de los controles de salud. La perspectiva de análisis de redes sociales permitió destacar el papel decisivo que cobran ciertas relaciones personales, funcionando como lazos eficaces que afectan significativamente el accionar de las adolescentes respecto a su salud durante el embarazo.The health care includes several social actors, this implies that its study should consider the role of the sociocultural contexts. The study of social networks is appropriate to address them. This paper presents an application of social network analysis as a complement of the methodological approach for the study of practices and health-related behaviors in adolescents mothers. This structure of personal networks is analyzed by EgoNet sofware. That structure is disscussed by identifying family networks that offer advices and provide instrumental assistance, acting as facilitators for the prenatal health controls. The social networks analysis perspective allows to emphasize the critical role acquired by certain personal relationships, which operate affecting significantly the health actions of the teenagers mothers during pregnancy.

  18. CASTIGO FEMENINO EN CHILE DURANTE LA PRIMERA MITAD DEL SIGLO XIX

    Directory of Open Access Journals (Sweden)

    Marcelo Neira Navarro

    2004-12-01

    Full Text Available El presente artículo permitió generar una serie de categorías de castigos femeninos, considerando que durante buena parte del siglo XIX la policía pudo aplicar "justicia correccional", es decir, sancionar delitos menores. De un universo de más de 32.000 arrestos efectuados en la ciudad de Santiago de Chile entre los años 1830 a 1840 y utilizando el criterio "femenino", el levantamiento logró una muestra que alcanzó al 12% del total. Los datos sistematizados permiten señalar que durante la primera mitad del siglo XIX el delito femenino fue parte importante de la actividad represiva en Chile y dio origen a un castigo relacionado a la Cárcel Correccional. Aunque también se observan otras penas como trabajo de casa formal o encierro en monasterios, forman parte de un circuito restrictivo en función del encierro de mujeres.The present article allowed to generate a series of categories of female punishments, considering that during a great part of the XIX century the police could apply "correctional justice", in other words, punish minor offences. In a universe of more than 32,000 arrest in the city of Santiago, Chile between the years 1830 and 1840 and using a "female" criteria, the uprising achieved a sample that reached 12% of the total. The systematized information shows that during the firt half of the xix century the female offence was an important part of the repressive activity in Chile and it gave origin to a punishment related to a correctional. Even though some other punishments were observed such a work in a formal house or monastery confinemet, they formed part of a restricting circuit functioning with the confinement of women.

  19. Zirconium - an imported mineral commodity

    International Nuclear Information System (INIS)

    This report examines Canada's position in regard to the principal zirconium materials: zircon; fusion-cast zirconium-bearing refractory products; zirconium-bearing chemicals; and zirconium metal, master alloys, and alloys. None of these is produced in Canada except fused alumina-zirconia and certain magnesium-zirconium alloys and zirconium-bearing steels. Most of the 3 000-4 000 tonnes of the various forms of zircon believed to be consumed in Canada each year is for foundry applications. Other minerals, notably chromite, olivine and silica sand are also used for these purposes and, if necessary, could be substituted for zircon. Zirconium's key role in Canada is in CANDU nuclear power reactors, where zirconium alloys are essential in the cladding for fuel bundles and in capital equipment such as pressure tubes, calandria tubes and reactivity control mechanisms. If zirconium alloys were to become unavailable, the Canadian nuclear power industry would collapse. As a contingency measure, Ontario Hydro maintains at least nine months' stocks of nuclear fuel bundles. Canada's vulnerability to short-term disruptions to supplies of nuclear fuel is diminished further by the availability of more expensive electricity from non-nuclear sources and, given time, from mothballed thermal plants. Zirconium minerals are present in many countries, notably Australia, the Republic of South Africa and the United States. Australia is Canada's principal source of zircon imports; South Africa is its sole source of baddeleyite. At this time, there are no shortages of either material. Canada has untapped zirconium resources in the Athabasca Oil Sands (zircon) and at Strange Lake along the ill-defined border between Quebec and Newfoundland (gittinsite). Adequate metal and alloy production facilities exist in France, Japan and the United States. No action by the federal government in regard to zirconium supplies is called for at this time

  20. Dor e comportamento de mulheres durante o trabalho de parto e parto em diferentes posições

    OpenAIRE

    Evenise Nilsen; Hugo Sabatino; Maria Helena Baena de Moraes Lopes

    2011-01-01

    Avaliou-se a intensidade da sensação dolorosa e o comportamento, durante o trabalho de parto e parto, entre mulheres que tiveram parto normal, sem analgesia, nas posições semi-sentada, decúbito lateral esquerdo e litotomia. O estudo foi descritivo, transversal e correlacional. Foram usados um questionário validado que avalia dor e comportamento durante o trabalho de parto e parto, segundo a perspectiva da mulher, e duas escalas de dor: uma analógica e outra alfanumérica. Observou-se que a dor...

  1. ¿Cognición semántica de alto nivel durante el sueño?

    Directory of Open Access Journals (Sweden)

    Agustín Ibáñez

    2008-07-01

    Full Text Available Estudios neurocientíficos recientes que sugieren una mente activa durante el sueño contradicen la idea platónica del sueño como muerte parcial. Dichos estudios muestran que el cerebro discrimina estímulos complejos durante el sueño, sugiriendo que permanecen activos procesos de alto nivel. Ello genera interrogantes sobre los mecanismos del sueño, replanteando la relación entre cognición y consciencia.

  2. Retención de aroma durante el secado de extracto de café en un sistema cerrado

    OpenAIRE

    J.F. Vílchez; Martínez, J

    2006-01-01

    Durante el secado de alimentos líquidos, componentes volátiles presentes en baja concentración que contribuyen al aroma y sabor del producto final son removidos junto con el agua. En consecuencia la calidad del producto final es considerablemente afectada por la cantidad de substancias volátiles que son retenidas durante el proceso de secado. En el extracto de café, por ejemplo, existen cientos de tales compuestos, la mayoría de ellos altamente volátiles por lo que se pierden cuando el extrac...

  3. The nanophase iron mineral(s) in Mars soil

    Science.gov (United States)

    Banin, A.; Ben-Shlomo, T.; Margulies, L.; Blake, D. F.; Mancinelli, R. L.; Gehring, A. U.

    1993-01-01

    A series of surface-modified clays containing nanophase (np) iron oxide/oxyhydroxides of extremely small particle sizes, with total iron contents as high as found in Mars soil, were prepared by iron deposition on the clay surface from ferrous chloride solution. Comprehensive studies of the iron mineralogy in these "Mars-soil analogs" were conducted using chemical extractions, solubility analyses, pH and redox, x ray and electron diffractometry, electron microscopic imaging, specific surface area and particle size determinations, differential thermal analyses, magnetic properties characterization, spectral reflectance, and Viking biology simulation experiments. The clay matrix and the procedure used for synthesis produced nanophase iron oxides containing a certain proportion of divalent iron, which slowly converts to more stable, fully oxidized iron minerals. The clay acted as an effective matrix, both chemically and sterically, preventing the major part of the synthesized iron oxides from ripening, i.e., growing and developing larger crystals. The precipitated iron oxides appear as isodiametric or slightly elongated particles in the size range 1-10 nm, having large specific surface area. The noncrystalline nature of the iron compounds precipitated on the surface of the clay was verified by their complete extractability in oxalate. Lepidocrocite (gamma-FeOOH) was detected by selected area electron diffraction. It is formed from a double iron Fe(II)/Fe(III) hydroxy mineral such as "green rust," or ferrosic hydroxide. Magnetic measurements suggested that lepidocrocite converted to the more stable maghemite (gamma-Fe2O3) by mild heat treatment and then to nanophase hematite (alpha-Fe2O3) by extensive heat treatment. After mild heating, the iron-enriched clay became slightly magnetic, to the extent that it adheres to a hand-held magnet, as was observed with Mars soil. The chemical reactivity of the iron-enriched clays strongly resembles, and offers a plausible mechanism

  4. Geology, geochemistry, geophysics, mineral occurrences, and mineral resource assessment for the commonwealth of Puerto Rico

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — Geologic map with faults, along with additional scientific information needed for mineral resource assessment (geochemical analyses, mineral occurrences, geologic...

  5. INFLUENCIA DE LAS MICORRIZAS ARBUSCULARES EN COMBINACIÓN CON DIFERENTES DOSIS DE FERTILIZANTE MINERAL EN ALGUNAS CARACTERÍSTICAS MORFOLÓGICAS DE LAS PLÁNTULAS DE TABACO

    OpenAIRE

    Yoanna Cruz Hernández; Milagro García Rubido; Yarilis León González; Juan M. Hernández Martínez

    2012-01-01

    En la Estación Experimental del Tabaco, San Juan y Martínez, Pinar del Río, se desarrolló una investigación durante las campañas tabacaleras 2005-2006 y 2006-2007, con el objetivo de determinar la influencia de la combinación de las micorrizas y dos dosis de fertilizante mineral, en semilleros con la variedad 'Corojo 99'. Se utilizó un diseño de bloques al azar con seis tratamientos y cuatro réplicas. Los resultados demostraron que se logra reducir la dosis de fertilizante mineral sin afec...

  6. U.S. Geological Survey Minerals Yearbook—Metals and Minerals

    Science.gov (United States)

    ,

    2016-01-01

    This edition of the U.S. Geological Survey (USGS) Minerals Yearbook discusses the performance of the worldwide minerals and materials industries during 2012 and provides background information to assist in interpreting that performance. Content of the individual Minerals Yearbook volumes follows:• Volume I, Metals and Minerals, contains chapters about virtually all metallic and industrial mineral commodities important to the U.S. economy. Chapters on survey methods, summary statistics for domestic nonfuel minerals, and trends in mining and quarrying in the metals and industrial mineral industries in the United States are also included.• Volume II, Area Reports: Domestic, contains a chapter on the mineral industry of each of the 50 States and Puerto Rico and the Administered Islands. This volume also has chapters on survey methods and summary statistics of domestic nonfuel minerals.• Volume III, Area Reports: International, is published as four separate reports. These regional reports contain the latest available minerals data on more than 180 foreign countries and discuss the importance of minerals to the economies of these nations and the United States. Each report begins with an overview of the region’s mineral industries during the year. It continues with individual country chapters that examine the mining, refining, processing, and use of minerals in each country of the region and how each country’s mineral industry relates to U.S. industry. Most chapters include production tables and industry structure tables, information about Government policies and programs that affect the country’s mineral industry, and an outlook section.The USGS continually strives to improve the value of its publications to users. Constructive comments and suggestions by readers of the Minerals Yearbook are welcomed.

  7. EXTRATERRESTRIAL MINERALS AND FUTURE FRONTIERS IN MINERAL EXPLORATION

    Directory of Open Access Journals (Sweden)

    WILMER GIRALDO

    2013-01-01

    Full Text Available Debido a las altas tasas de consumo de minerales y el alto crecimiento de la población humana, los recursos minerales en el planeta Tierra se encuentran en proceso de agotamiento, esta escasez crea la necesidad de encontrar nuevas alternativas para suplir las crecientes necesidades. Una alternativa adicional a la tradicional búsqueda de nuevos yacimientos en la tierra, es la búsqueda de yacimientos más allá de nuestro planeta, estos nuevos recursos se pueden buscar en la vecindad de nuestro planeta. La extracción en cuerpos de nuestro sistema solar como la Luna, Marte y el cinturón de asteroides puede proporcionar abundantes recursos energéticos como el helio 3 y minerales como el potasio, elementos de tierras raras, hierro y minerales del grupo del platino. Ahora, algunas compañías están planeando esta exploración y para los geólogos y profesionales de la minería en general, esto abre grandes posibilidades para la investigación científica, innovación tecnológica y desarrollo profesional en nuevos campos.

  8. 36 CFR 292.18 - Mineral resources.

    Science.gov (United States)

    2010-07-01

    ... 36 Parks, Forests, and Public Property 2 2010-07-01 2010-07-01 false Mineral resources. 292.18... RECREATION AREAS Sawtooth National Recreation Area-Federal Lands § 292.18 Mineral resources. (a) Occupancy... exploration work which will not cause significant damage to surface resources and will not involve the...

  9. Mineral nutrition of cocoa : a review

    NARCIS (Netherlands)

    Vliet, van J.A.; Slingerland, M.A.; Giller, K.E.

    2015-01-01

    This literature review on mineral nutrition of cocoa was commissioned by the Scientific Committee of the Cocoa Fertiliser Initiative to address the following questions: What knowledge is currently available about mineral nutrition of cocoa? What are the current knowledge gaps? What are the key areas

  10. Current concepts in perinatal mineral metabolism.

    Science.gov (United States)

    Ohata, Yasuhisa; Ozono, Keiichi; Michigami, Toshimi

    2016-01-01

    The serum levels of calcium (Ca) and phosphate are maintained higher in the fetus than in the pregnant mother, especially in late gestation, to meet the demands of fetal bone development. In order to maintain this fetal stage-specific mineral homeostasis, the placenta plays a critical role through active transcellular mineral transport. Although the molecular mechanism of transplacental Ca transport has been well studied, little is known about the transport mechanism of phosphate and magnesium. Maternal mineral homeostasis is also altered during pregnancy to supply minerals to the fetus. In the lactating mother, osteocytic osteolysis is suggested to be involved in the supply of minerals to the baby. The levels of some calcitropic and phosphotropic (Ca- and phosphate-regulating, respectively) hormones in the fetus are also different from those in the adult. The PTH level in the fetus is lower than that in the mother and nonpregnant adult. It is suggested, however, that low fetal PTH plays an important role in fetal mineral metabolism. The concentration of PTHrP in the fetus is much higher than that of PTH and plays a critical role in perinatal Ca homeostasis. Uncovering the molecular mechanisms for fetal stage-specific mineral metabolism will lead to better management of perinatal patients with mineral abnormalities. PMID:26865750

  11. Mineral resource of the month: tantalum

    Science.gov (United States)

    ,

    2011-01-01

    The article offers information on a rare transition metal called tantalum. It says that the blue-gray mineral resource was discovered in 1801 or 1802 and was used for capacitors in 1940. It adds that the tantalite ore and other minerals in the ore should be separated in order to generate concentrates of tantalum. The use of tantalum are also cited.

  12. Acidosis inhibits mineralization in human osteoblasts.

    Science.gov (United States)

    Takeuchi, Shoko; Hirukawa, Koji; Togari, Akifumi

    2013-09-01

    Osteoblasts and osteoclasts maintain bone volume. Acidosis affects the function of these cells including mineral metabolism. We examined the effect of acidosis on the expression of transcription factors and mineralization in human osteoblasts in vitro. Human osteoblasts (SaM-1 cells) derived from the ulnar periosteum were cultured with α-MEM containing 50 μg/ml ascorbic acid and 5 mM β-glycerophosphate (calcifying medium). Acidosis was induced by incubating the SaM-1 cells in 10 % CO₂ (pH approximately 7.0). Mineralization, which was augmented by the calcifying medium, was completely inhibited by acidosis. Acidosis depressed c-Jun mRNA and increased osteoprotegerin (OPG) production in a time-dependent manner. Depressing c-Jun mRNA expression using siRNA increased OPG production and inhibited mineralization. In addition, depressing OPG mRNA expression with siRNA enhanced mineralization in a dose-dependent manner. Acidosis or the OPG protein strongly inhibited mineralization in osteoblasts from neonatal mice. The present study was the first to demonstrate that acidosis inhibited mineralization, depressed c-Jun mRNA expression, and induced OPG production in human osteoblasts. These results suggest that OPG is involved in mineralization via c-Jun in human osteoblasts.

  13. Intracellular transport of ions in mineralizing tissues

    International Nuclear Information System (INIS)

    This study resulted in the development of a new model for bone cell physiology and has provided the means for studying the mechanism and site of action of bone affecting hormones and vitamin metabolites and has provided new information on mechanisms of mineralization and mineralization defects

  14. Minerals in fish: does the source matter?

    NARCIS (Netherlands)

    Antony Jesu Prabhu, P.

    2015-01-01

    Antony Jesu Prabhu, P. (2015). Minerals in fish: does the source matter? PhD thesis. Wageningen University, The Netherlands. Minerals are a group of micro-nutrients essential to fish. Meta-analysis of literature data was performed to identify the appropriate response criterion to de

  15. Mineral Oil Aspiration Related Juvenile Idiopathic Arthritis.

    Science.gov (United States)

    Nelson, Andrew D; Fischer, Philip R; Reed, Ann M; Wylam, Mark E

    2015-01-01

    We describe the development of rheumatoid factor-positive migratory polyarthritis in a 5-year-old male who had been administered bidaily oral mineral oil as a laxative since birth. Minor respiratory symptoms, radiographic and bronchoscopic findings were consistent with chronic lipoid pneumonia. We speculate that immune sensitization to mineral oil promoted the clinical syndrome of juvenile idiopathic arthritis. PMID:26171269

  16. Mineral Oil Aspiration Related Juvenile Idiopathic Arthritis

    OpenAIRE

    Nelson, Andrew D.; Fischer, Philip R.; Reed, Ann M.; Wylam, Mark E

    2015-01-01

    We describe the development of rheumatoid factor-positive migratory polyarthritis in a 5-year-old male who had been administered bidaily oral mineral oil as a laxative since birth. Minor respiratory symptoms, radiographic and bronchoscopic findings were consistent with chronic lipoid pneumonia. We speculate that immune sensitization to mineral oil promoted the clinical syndrome of juvenile idiopathic arthritis.

  17. Mineral Oil Aspiration Related Juvenile Idiopathic Arthritis

    Directory of Open Access Journals (Sweden)

    Andrew D. Nelson

    2015-01-01

    Full Text Available We describe the development of rheumatoid factor-positive migratory polyarthritis in a 5-year-old male who had been administered bidaily oral mineral oil as a laxative since birth. Minor respiratory symptoms, radiographic and bronchoscopic findings were consistent with chronic lipoid pneumonia. We speculate that immune sensitization to mineral oil promoted the clinical syndrome of juvenile idiopathic arthritis.

  18. Dehydration-induced luminescence in clay minerals

    Science.gov (United States)

    Coyne, L. M.; Lahav, N.; Lawless, J. G.

    1981-01-01

    Reports of triboluminescent phenomena in organic crystalline materials prompted a search for related processes in clay minerals. The reported extensive mechanical distortion produced on freezing and drying of montmorillonite was particularly interesting because of studies of condensation reactions in a wet/dry cycled reaction sequence. The discovery of an unusual luminescent process in several clay minerals is reported and its characteristics are described.

  19. Utilization of mining and mineral wastes

    Energy Technology Data Exchange (ETDEWEB)

    Park, Kyung Ho; Hong, Seung Woong; Choi, Young Yoon; Kim, Byung Gyu; Park, Je Shin [Korea Institute of Geology Mining and Materials, Taejon (Korea)

    1998-12-01

    Up to now, it is estimated that more than 50 million tons of mineral wastes have been generated mining industries and deposited on the land in Korea. Much of cultivated land and hilly areas have been occupied by this wastes, which cause pollution of the environment. Utilization of the mineral wastes is preferable to stabilization because full use would both eliminate the waste and broaden the mineral resource base. Therefore, the development of utilization techniques of mineral wastes is very important not only for improving the environment but also for resource conservation. In countries with high population and poor natural resources like Korea, the utilization of these wastes is essential to decrease the environmental problem and the secure the resources and the study on this field play a important part. Therefore, the objective of this study is to develop the utilization techniques of the mineral wastes. In first year's research, the contents and scope of this study are 1) Present condition and Field Survey on the mineral wastes with respect of their utilization, 2) Reviews of Current effects and research to utilize mineral wastes, 3) Characterization of mineral wastes and environmental test, 4) Evaluation and study on the utilization. (author). 67 refs., 25 tabs., 54 figs.

  20. Earth mineral resource of the month: asbestos

    Science.gov (United States)

    Virta, Robert L.

    2010-01-01

    The article discusses the characteristics and feature of asbestos. According to the author, asbestos is a generic name for six needle-shaped minerals that possess high tensile strengths, flexibility, and resistance to chemical and thermal degradation. These minerals are actinolite, amosite, anthophyllite, chrysolite, crocilodite and tremolite. Asbestos is used for strengthening concrete pipe, plastic components, and gypsum plasters.

  1. Biochemical bases of mineral waters genesis

    Directory of Open Access Journals (Sweden)

    D. D. Zhernosekov

    2005-02-01

    Full Text Available This work directs data about mineral water genesis. The accent on balneological sense is done. We suggest the criteria of biochemical processes estimation which take part in mineral water compounds creation. These criteria can be used for illustration of dependence between waters medical properties and biochemical processes of their genesis.

  2. Characterization of Mexican zeolite minerals

    International Nuclear Information System (INIS)

    50% of the Mexican territory is formed by volcanic sequences of the Pliocene type, which appear extensively in the northwest states (Sonora, Sinaloa, Chihuahua, Durango) and west of Mexico (Jalisco and Nayarit), in central Mexico (Zacatecas, Guanajuato, San Luis Potosi, Queretaro, Hidalgo) and south of Mexico (Guerrero, Oaxaca); therefore, it is to be expected that in our country big locations of natural zeolites exist in its majority of the clinoptilolite type. The present study was focused toward the characterization of two Mexican natural zeolite rocks presumably of the clinoptilolite and filipsite types, one of them comes from the state of Chihuahua and the other of a trader company of non metallic minerals, due that these materials are not characterized, its are not known their properties completely and therefore, the uses that can be given to these materials. In this investigation work it was carried out the characterization of two Mexican zeolite rocks, one coming from the Arroyo zone, municipality of La Haciendita, in the state of Chihuahua; and the other one was bought to a trader company of non metallic minerals. The two zeolites so much in their natural form as conditioned with sodium; they were characterized by means of X-ray diffraction, scanning electron microscopy of high vacuum and elementary microanalysis (EDS), surface area analysis (BET), thermal gravimetric analysis. To differentiate the heulandite crystalline phase of the other clinoptilolite rock, its were carried out thermal treatments. The quantification of Al, Na, Ca, K, Mg, Fe was carried out in solution, by means of atomic absorption spectroscopy and the quantity of Si was determined by gravimetry. The zeolite rocks presented for the major part the crystalline heulandite and clinoptilolite phases for the most part, and it was found that the zeolite coming from the state of Chihuahua possesses a bigger content of heulandite and the denominated filipsite it is really a zeolite

  3. Thermoelastic properties of minerals at high temperature

    Indian Academy of Sciences (India)

    Sanjay Upadhyay; Hem Chandra; Meenakashi Joshi; Deepika P Joshi

    2011-01-01

    The knowledge of elasticity of the minerals is useful for interpreting the structure and composition of the lower mantle and also in seismic studies. The purpose of the present study is to discuss a simple and straightforward method for evaluating thermoelastic properties of minerals at high temperatures. We have extended the Kumar’s formulation by taking into the account the concept of anharmonicity in minerals above the Debye temperature (D). In our present study, we have investigated the thermophysical properties of two minerals (pyrope-rich garnet and MgAl2O4) under high temperatures and calculated the second-order elastic constant () and bulk modulus (T) of the above minerals, in two cases first by taking Anderson–Gruneisen parameter (T) as temperature-independent and then by treating T as temperature-dependent parameter. The results obtained when T is temperature-dependent are in close agreement with experimental data.

  4. Biohydrometallurgy for nonsulfidic minerals - A review

    Energy Technology Data Exchange (ETDEWEB)

    Jain, N.; Sharma, D.K. [Indian Institute of Technology of Delhi, New Delhi (India). Center for Energy Studies

    2004-05-01

    Bioleaching is a technology applicable to metal extraction from low-grade ores, ore beneficiation, coal beneficiation, metal detoxification, and recovery of metals from waste materials. The technology is environmentally sound and it may lower operational cost and energy requirement. Whereas leaching of sulfidic minerals using chemolithoautotrophic bacteria is the most studied and commercially exploitable aspect of mineral biotechnology today, there is a dearth of literature on the dissolution of nonsulfidic minerals. Biohydrometallurgy of nonsulfidic minerals involves the action of heterotrophic microorganisms. Heterotrophic bacteria and fungi have the potential for producing acidic metabolites that are able to solubilize oxide, silicate, carbonate and hydroxide minerals by reduction, acidolysis and complexation mechanisms. It is an important aspect of biohydrometallugy that requires development to meet future needs.

  5. Organización musical y repertorio en la catedral de bogotá durante el siglo xvi

    OpenAIRE

    Bermúdez, Egberto

    2014-01-01

    El presente artículo tiene como objetivo la consideración del repertorio de música religiosa del siglo XVI contenido en el Archivo Capitular de la Catedral de Bogotáa la luz de la organización de la actividad musical en dicha iglesia durante el mismo período.

  6. Tratamiento ayuda a mujeres jóvenes a preservar fertilidad durante quimioterapia para cáncer de seno

    Science.gov (United States)

    Las mujeres jóvenes con cáncer de seno (mama) lograron preservar la fertilidad durante los tratamientos del cáncer con un fármaco inyectable bloqueador de hormonas que les provocó menopausia temporal. Los resultados del estudio se anunciaron hoy en el con

  7. Feldspar minerals as efficient deposition ice nuclei

    Directory of Open Access Journals (Sweden)

    J. D. Yakobi-Hancock

    2013-06-01

    Full Text Available Mineral dusts are well known to be efficient ice nuclei, where the source of this efficiency has typically been attributed to the presence of clay minerals such as illite and kaolinite. However, the ice nucleating abilities of the more minor mineralogical components have not been as extensively examined. As a result, the deposition ice nucleation abilities of 24 atmospherically-relevant mineral samples have been studied, using a continuous flow diffusion chamber at −40.0 ± 0.3 °C. The same particle size (200 nm and particle preparation procedure were used throughout. The ice nucleation behaviour of the pure minerals is compared to that of complex mixtures, such as Arizona Test Dust (ATD and Mojave Desert Dust (MDD, and to lead iodide, which has been previously proposed for cloud seeding. Lead iodide was the most efficient ice nucleus (IN, requiring a critical relative humidity with respect to ice (RHi of 122.0 ± 2.0% to activate 0.1% of the particles. MDD (RHi 126.3 ± 3.4% and ATD (RHi 129.5 ± 5.1% have lower but comparable activity. From a set of clay minerals (kaolinite, illite, montmorillonite, non-clay minerals (e.g. hematite, magnetite, calcite, cerussite, quartz, and feldspar minerals (orthoclase, plagioclase present in the atmospheric dusts it was found that the feldspar minerals (particularly orthoclase, and not the clays, were the most efficient ice nuclei. Orthoclase and plagioclase were found to have critical RHi values of 127.1 ± 6.3% and 136.2 ± 1.3%, respectively. The presence of feldspars (specifically orthoclase may play a significant role in the IN behaviour of mineral dusts despite their lower percentage in composition relative to clay minerals.

  8. Bone Mineralization in Celiac Disease

    Directory of Open Access Journals (Sweden)

    Tiziana Larussa

    2012-01-01

    Full Text Available Evidence indicates a well-established relationship between low bone mineral density (BMD and celiac disease (CD, but data on the pathogenesis of bone derangement in this setting are still inconclusive. In patients with symptomatic CD, low BMD appears to be directly related to the intestinal malabsorption. Adherence to a strict gluten-free diet (GFD will reverse the histological changes in the intestine and also the biochemical evidence of calcium malabsorption, resulting in rapid increase of BMD. Nevertheless, GFD improves BMD but does not normalize it in all patients, even after the recovery of intestinal mucosa. Other mechanisms of bone injury than calcium and vitamin D malabsorption are thought to be involved, such as proinflammatory cytokines, parathyroid function abnormalities, and misbalanced bone remodeling factors, most of all represented by the receptor activator of nuclear factor B/receptor activator of nuclear factor B-ligand/osteoprotegerin system. By means of dual-energy X-ray absorptiometry (DXA, it is now rapid and easy to obtain semiquantitative values of BMD. However, the question is still open about who and when submit to DXA evaluation in CD, in order to estimate risk of fractures. Furthermore, additional information on the role of nutritional supplements and alternative therapies is needed.

  9. Surface mining of mineral resources

    Energy Technology Data Exchange (ETDEWEB)

    Braeunig, H.D.

    1982-05-01

    This article outlines general advantages of surface mining technology and aspects of selecting the most suitable mining technology in surface mine projection. Heavy surface mining equipment of the TAKRAF engineering plants is recommended for efficient excavation and overburden removal up to 230,000 m/sup 3/d capacity with the largest excavator type and 440,000 m/sup 3/d capacity with the largest overburden conveyor bridge. Two major variants of surface mine technology are outlined: design of surface mines with continuous working equipment (bucket wheel or bucket chain excavators requiring up to 200 N/cm digging force for minerals and overburden and haulage by belt conveyors) or discontinuously working equipment (dragline excavators, truck transportation, etc.). The second major variant concerns overburden removal to the spoil bank, either by haulage in a semicircle around the pit or by a shortcut across the pit from the excavation to the spoil bank side (direct spoil removal method). TAKRAF equipment for surface mining operations is described with various specifications and details on its performance. (In German)

  10. Desconforto e dor durante realização da mamografia Discomfort and pain during mammography

    Directory of Open Access Journals (Sweden)

    Ruffo Freitas Júnior

    2006-10-01

    Full Text Available A mamografia é o método mais importante na detecção precoce do câncer de mama. Não obstante, o desconforto e a dor são queixas freqüentes durante o exame. OBJETIVO: Avaliar a freqüência de desconforto e de dor durante a mamografia e identificar fatores relacionados com essas queixas. MÉTODOS: Estudo prospectivo incluindo 2.164 pacientes, sendo que 996 previdenciárias e 1.168 da rede privada. Após o exame, a paciente quantificava a dor sentida, de acordo com uma escala linear analógica. O desconforto foi avaliado qualitativamente por análise multivariada. RESULTADOS: O desconforto foi a queixa de 90% das pacientes; dessas 12% referiram desconforto intenso ou intolerável. Apenas 2% do grupo estudado não apresentaram dor durante o exame. Os fatores associados à dor foram: idade da paciente, o uso de anticoncepcional (ACO, mastalgia prévia e pacientes privadas. O desconforto esteve independentemente associado ao centro de realização do exame (OR = 2,50; IC 1,64-5,17 e à mastalgia prévia (OR = 3,15; IC 1,96-7,12. A aceitabilidade de uma futura mamografia foi de 98%. CONCLUSÃO: Mulheres jovens (INTRODUCTION: Mammography is the most important method for early detection of breast cancer, however, patients frequently complain of discomfort and pain. OBJECTIVE: Evaluate how often discomfort and pain are felt during mammography and identify factors that may be associated to these complaints. METHODS: A prospective study including 2,164 patients recruited from public (996 and private (1,168 health services was carried out. After the imaging procedure, patients quantified pain using a linear analogical scale. Discomfort was qualitatively evaluated by multivariate analysis. RESULTS: Discomfort was reported by 90% of the patients, and of these 12% rated the sensation as intense or intolerable. Only 2% of the women in the study group did not feel any pain during the procedure. Factors associated to pain were: age, use of birth control

  11. Actividad ovárica durante el postparto temprano de vacas cebú en amamantamiento.

    Directory of Open Access Journals (Sweden)

    Henao Guillermo

    2002-06-01

    Full Text Available Para estudiar la actividad ovárica durante el postparto temprano de vacas Cebú en amamantamiento, se determinaron las características del desarrollo folicular y lúteo durante los primeros dos meses postparto en cinco vacas de 5,3 ±1,6 años de edad y 383 ± 29,6 kg de peso vivo, que tuvieron el último parto normal. La investigación se realizó en el Centro "Cotové" de la Universidad Nacional de Colombia, Sede de Medellín, ubicado en el municipio de Santa Fe de Antioquia, correspondiente a una zona ecológica de bosque seco tropical (bs-T. A cada vaca se le practicó examen ultrasonográfico ovárico y determinación de la concentración sérica de progesterona por radioinmunoanálisis tres veces por semana y se le realizó detección de estros a partir del día del parto. La dinámica folicular durante el postparto temprano se caracterizó por un desarrollo precoz (desde el día seis postparto de ondas foliculares conformadas por cohortes de 6,0 ± 0,4 folículos antrales de los cuales se formó un folículo dominante (FD que alcanzó un diámetro de 10,4 ± 0,5 mm al día 12,8 ± 2,0. La duración promedio de las ondas foliculares fue 9,6 ± 2,7 días. Las características de los folículos dominantes y subordinados no presentaron diferencias (p>0,05 entre vacas. De las cinco vacas analizadas, tres presentaron su primera ovulación postparto al día 34,4 ± 12,3 sin signos de estro y dos de ellas presentaron una segunda ovulación con signos de estro antes de los 60 días postparto, para un intervalo interovulatorio de 19 ±5 días y un intervalo parto primer estro de 49 ± 8 días. El primer folículo ovulatorio midió 12,0 ± 0,8 mm de diámetro y fue semejante (p>0,05 al promedio de los diámetros de los demás Fds. Después de la primera ovulación se formó un cuerpo lúteo (CL de 16,7 ± 1,3 mm de diámetro, con una vida media de 11,3 ± 3,8 días y un máximo de 1,0 ± 0,3 ng/ml de progesterona. El CL formado después de la

  12. Uso de medicamentos durante a lactação Breastfeeding and maternal medications

    Directory of Open Access Journals (Sweden)

    Roberto G. Chaves

    2004-11-01

    Full Text Available OBJETIVO: Contribuir com informações para o uso racional de medicamentos durante a amamentação. FONTES DOS DADOS: Foram selecionados artigos na base de dados MEDLINE, de 1993 a 2004, e no Lilacs, de 1995 a 2004, em português, espanhol e inglês, usando as palavras-chave aleitamento, lactação, drogas e medicamentos. Outras referências recentes encontradas em artigos e livros foram incluídas a fim de fornecer subsídios para a realização deste artigo. SÍNTESE DOS DADOS: A maior parte dos fármacos é compatível com a amamentação. Poucos são contra-indicados (antineoplásicos, radiofármacos, drogas de abuso; alguns requerem cuidados devido ao risco de efeitos adversos em lactentes ou de redução do volume de leite. Porém, ainda é necessário maior conhecimento sobre os efeitos para a criança de muitos fármacos durante a amamentação. CONCLUSÕES: O princípio fundamental da prescrição de medicamentos para mães em lactação baseia-se no conceito de risco e benefício. Deve-se fazer opção, sempre que possível, por uma droga já estudada, que seja pouco excretada no leite materno e que não tenha risco aparente para a saúde da criança. Medicamentos que reduzem a produção de leite pela nutriz devem ser evitados durante a lactação, e o uso dos galactagogos está reservado para situações especiais. Dessa maneira, só excepcionalmente o aleitamento materno precisa ser desencorajado ou descontinuado quando a mãe necessitar de tratamento farmacológico.OBJECTIVE: To contribute with information about the adequate administration of drugs during breastfeeding. SOURCES OF DATA: MEDLINE articles from 1993 to 2004, and Lilacs articles from 1995 to 2004 were selected in Portuguese, Spanish and English, by including the following keywords: breastfeeding, lactation, drugs and medicines. Other update references found in articles and books were also included in this review, in order to provide additional information. SUMMARY OF

  13. Cambios reológicos del queso Colonia durante el proceso de maduración

    Directory of Open Access Journals (Sweden)

    María José Crosa

    2011-05-01

    Full Text Available El queso Colonia es un queso típico uruguayo, elaborado según los criterios de calidad y tradición quesera de los inmigrantes suizos radicados en la cuenca lechera del departamento de Colonia. En la actualidad no se reporta información publicada acerca de los cambios reológicos que ocurren en el queso durante su maduración. Su investigación y publicación aportan conocimiento para la difusión de un proceso que aún no presenta denominación de origen protegida. En el presente trabajo se midieron los cambios reológicos mediante el ensayo de relajación-compresión, durante el proceso de maduración realizado a 8 ºC y 85 % de humedad relativa hasta el día 13. Los resultados obtenidos manifiestan la existencia de un cambio importante del comportamiento a partir del día 11 de maduración, momento en que ocurre un notorio ablandamiento del queso. Esto concuerda con la práctica industrial que tradicionalmente realiza el cambio de los quesos para continuar su maduración en cámara caliente a partir del onceavo día. Este estudio demuestra la importancia de esperar hasta el onceavo día para asegurar la elasticidad necesaria en el queso para una adecuada formación de ojos en la cámara caliente.Abstract“Colonia” cheese is a typical Uruguayan cheese, elaborated following the quality standards and cheese making tradition of the swiss inmigrants established at the uruguayan department of Colonia and sourrondings. Actually there is no available information about the reological changes that happen in this kind of cheese during its ripeness. The study and publication of this process (which does not present a protected designation of origin (DOP yet gives knowledge for its spread.Rheological changes were analyzed with the stress relaxation test along the ripeness process made at 8 ºC and a humidity of 85 % until the 13th day. The results indicate that an important performance change exists after the 11th ripeness day, where a remarkable

  14. Experiencias de las mujeres durante el trabajo de parto y parto

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    Dora Isabel Giraldo Montoya

    2015-05-01

    Full Text Available Objetivo: Develar las experiencias de las mujeres durante el trabajo de parto y parto en una Unidad Materno Infantil de Medellín, durante el año 2013. Metodología: Estudio cualitativo, de tipo fenomenológico. Muestreo representado en la saturación teórica, con la participación de 13 mujeres a quienes se les aplicó la entrevista a profundidad. Se construyeron las categorías descriptivas, posteriormente se agruparon en categorías de orden axial y finalmente se obtuvieron las de orden selectivo para determinar las categorías núcleo. Se desarrolló la triangulación a través de grupos focales y la observación. El estudio obtuvo la aprobación del Comité de Ética y se utilizó el consentimiento informado por escrito. Resultados: Surgieron tres categorías principales: Los síntomas desagradables, La soledad y Yo quiero ver a Camila. Desde la teoría de rango medio de los síntomas desagradables, se encontró que el dolor, la fatiga y la sed son experiencias altamente significativas que comprometen el bienestar y la satisfacción materna. La soledad estuvo presente en todo el proceso, sin embargo el apoyo espiritual y la presencia del personal de salud fueron una fuente de acompañamiento. A pesar del sufrimiento y el dolor del trabajo de parto, el nacimiento las hizo olvidar estos acontecimientos y consideraron que el proceso del parto las reafirmaba frente a la adopción de su rol materno. Conclusiones: Se deben cambiar los métodos tradicionales de cuidado y propiciar otras formas de atención más humanizadas para que las mujeres asuman su rol de madres con seguridad y decisión.

  15. Naos, clima y glaciares en el Estrecho de Magallanes durante el siglo XVI

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    Prieto, María del Rosario

    1998-12-01

    Full Text Available Not available.

    El objetivo de este trabajo es lograr una aproximación al clima y a los fenómenos de glaciación ocurridos en el Estrecho de Magallanes durante el siglo XVI y parte del XVII a través de registros históricos. Se complementan los resultados obtenidos por investigadores de otras disciplinas paleoclimáticas en el área, verificándose si las fuentes históricas corroboran las conclusiones de esos autores, quienes postulan un intervalo muy frío entre 1520 y 1670. Para realizar esta investigación se utilizaron los “diarios o relaciones de navegación” de los primeros marinos españoles que pasaron por el Estrecho, recopilados en su mayor parte en Archivos históricos españoles. A través de la técnica del análisis de contenido se verificó la estabilidad en el vocabulario referido al clima y los glaciares a lo largo de esas centurias y se calificó los eventos de acuerdo a su magnitud. Se determinaron diversas categorías de las cuales se han seleccionado precipitaciones sólidas y líquidas, temperatura, dirección del viento y ocurrencia de tormentas para analizar en este trabajo. Se estudió especialmente la presencia de témpanos en el Estrecho y las descripciones de los glaciares fueguinos y del sur de la Patagonia chilena como indicadores de bajas temperaturas. Se concluye que existen referencias directas a la presencia de témpanos proveniente de glaciares en el Estrecho, sólo en la segunda mitad del siglo XVI. El avance de los hielos supondría una acentuación de las condiciones de frío durante esa centuria, lo que puede ser corroborado por los datos de los navíos que consignan temperaturas estivales frías y muy frías en la vertiente pacífica. Estos datos coincidirían con los resultados de R. Villalba en cuanto a que el intervalo 1520 a 1670 fue uno de los más fríos de la Pequeña Edad Glaciar.

  16. Hipertrigliceridemia familiar grave durante a gestação Severe familial hypertriglyceridemia during pregnancy

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    Luiz Augusto Casulari

    2001-07-01

    Full Text Available A presença de hipertrigliceridemia grave durante a gravidez é rara, mas comporta grande possibilidade de desenvolver complicações, como a pancreatite aguda, que coloca em risco a mãe e o feto. Apresentamos o relato da evolução da gestação de uma paciente portadora de hipertrigliceridemia grave que havia apresentado pancreatite aguda dois meses antes da fecundação. Foi tratada durante o pré-natal com dieta e 3,0 g de ácidos graxos de cadeia ômega-3 (ácidos eicosapentaenóico 14% e docosahexaenóico 11,13%. Os níveis de triglicerídeos foram mantidos abaixo de 800 mg/dl, sendo este limite considerado seguro para evitar o desenvolvimento de pancreatite aguda. A gestação evoluiu, sem intercorrências, para parto vaginal, a termo. O recém-nato não apresentou alterações morfológicas ao nascimento. Concluímos que, nesta paciente grávida e portadora de hipertrigliceridemia grave, uma dieta adequada e o emprego de ácidos graxos de cadeia ômega-3 foram eficazes em prevenir a pancreatite aguda. Esta abordagem terapêutica pode ser uma alternativa para as gestantes portadoras de hipertrigliceridemia familiar.Severe hypertriglyceridemia during pregnancy rarely occurs but it frequently produces complications, such as acute pancreatitis, a serious health risk both for the mother and the fetus. The treatment of a patient who had had acute pancreatitis due to hypertriglyceridemia (triglyceridemia = 5100 mg/dl two months before fecundation is presented in this paper. During gestation, bezafibrate was substituted for 3.0 g omega-3 fatty acids (14% eicosapentaenoic and 11.13% docosahexaenoic acids. With this therapy, the triglyceride levels were maintained below 800 mg/dl, which is considered to be the safe limit to avoid acute pancreatitis. No complication occurred during pregnancy, the patient delivered vaginally (40 weeks, and the newborn (3075 g did not present any morphological alterations. We conclude that an adequate diet and the

  17. COMPARTIMENTACIÓN INTRACELULAR DEL ACETATO EN NEURONAS DURANTE LA PRELACTANCIA

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    B. Barrios-Socha

    2006-06-01

    Full Text Available En la transición a la vida extrauterina, el recién nacido sufre un período de ayuno (prelactancia que transcurre entre el cese de la nutrición placentaria y la instauración de la lactancia. El gasto de energía por las neuronas es tan alto en estas circunstancias, que la glucogenólisis es incapaz de restablecer los niveles de glucosa en la sangre. En consecuencia, durante la prelactancia debe haber otros sustratos energéticos y lipogénicos, que adicionalmente ayuden a mantener la síntesis de neurotransmisores.Este trabajo establece la importancia de acetato en el metabolismo oxidativo y del lipogénico en neuronas durante la prelactancia. Se determinaron las velocidades de oxidación y lipogénesis en cultivos quiescentes de neuronas fetales de rata incubadas con acetato (5 mM, [1- 14C]-acetato, [2- 14C]-acetato y [U- 14C]-acetato(200-300dpm/nmol Adicionalmente, se utilizaron inhibidores enzimáticos como el dicloroacetato(1 mM y el aminooxiacetato (5 mM, e inhibidores del transporte como el α-ciano-4-hidroxicinnamato(2 mM, butilmalonato (5 mM y 1,2,3-bencenotricarboxilato (5 mM.Los resultados en su conjunto indican que las neuronas pueden metabolizar acetato más como sustrato energético que lipogénico, lo que nos permite pensar que este sustrato puede llegar a ser más importante para ayudar a mantener el metabolismo oxidativo, favoreciendo el reciclaje de carbonos en la prelactancia.Adicionalmente, se evidenció con el uso de [1-14C]-acetato una alta actividad anaplerótica sobre todo cuando las neuronas requieren mantener los reservorios de oxalacetato y acetil-CoA para mantener la respiración. Estos resultados señalan a la acetil-CoA sintetasa (AceCS2 y la enzima málica (mME mitocondriales, como enzimas claves para mantener el funcionamiento de las neuronas en la prelactancia.Con el uso de [2-14C]-acetato, los resultados sugieren que las neuronas tienen un alto requerimiento de carbonos, principalmente para la síntesis de

  18. Efeito de inoculante bacteriano sobre a qualidade da silagem e perda de matéria seca durante a ensilagem de sorgo

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    Pedroso André de Faria

    2000-01-01

    Full Text Available RESUMO - O objetivo deste trabalho foi avaliar o efeito de um inoculante bacteriano comercial, contendo Lactobacillus plantarum, Streptococcus faecium e Pediococcus acidactili, sobre a qualidade da silagem e perda de matéria seca (MS durante a ensilagem de sorgo (Sorghum bicolor L. Moench. Os tratamentos foram constituídos por dois tipos de silagem de sorgo duplo-propósito colhido no estádio farináceo: sem (controle e com inoculante; três posições dentro de cada silo (região do terço inicial, região central e do terço final, correspondendo a três períodos de coleta (52, 65 e 71 dias de fermentação e três repetições em cada posição. Cada repetição foi constituída por um saco de tela plástica de malha fina, contendo aproximadamente 4 kg de forragem, sendo a parcela representada por uma amostra de aproximadamente 1 kg de forragem. A silagem com inoculante apresentou menor teor de cinza (matéria mineral, nitrogênio amoniacal e ácido láctico e níveis mais elevados de fibra em detergente neutro e fibra em detergente ácido. A silagem com inoculante não diferiu do controle em relação ao pH, à proteína bruta, energia bruta e porcentagem de perda da MS.

  19. Authigenic minerals: Biologically influenced and induced organomineralization

    Science.gov (United States)

    Dupraz, Christophe

    2016-04-01

    Organominerals are minerals precipitated by interactions with organic matter without enzymatic control. Organomineralization of authigenic carbonate minerals depends on two key components: (1) the "carbonate alkalinity engine" impacting the calcium carbonate saturation index and (2) the organic matrix comprised of extracellular organic matter (EOM), which provides a template for carbonate nucleation. The alkalinity engine can be "intrinsic" when microbial metabolisms increase supersaturation or lower the kinetic barrier of precipitation, or "extrinsic" when the physicochemical environment creates the conditions for mineral formation. The organic matrix produced by various communities within the microbial mats is known to influence nucleation, morphology and mineralogy of minerals through binding of cations. By playing with these two key components, three types of authigenic minerals can be formed: (1) a purely physicochemical precipitation on an abiotic substrate, (2) a precipitation "influenced" by the presence of an organic matrix but resulting from a physicochemical forcing (environmentally driven), or (3) a "microbially-induced" precipitation, in which both supersaturation and organic matrix are resulting from microbial activity. In this keynote, we will review important processes involved in the precipitation of authigenic carbonate minerals in modern microbial mats and open the discussion on the potential use of authigenic carbonate minerals as biosignatures in the fossil record.

  20. Mathematical Model for the Mineralization of Bone

    Science.gov (United States)

    Martin, Bruce

    1994-01-01

    A mathematical model is presented for the transport and precipitation of mineral in refilling osteons. One goal of this model was to explain calcification 'halos,' in which the bone near the haversian canal is more highly mineralized than the more peripheral lamellae, which have been mineralizing longer. It was assumed that the precipitation rate of mineral is proportional to the difference between the local concentration of calcium ions and an equilibrium concentration and that the transport of ions is by either diffusion or some other concentration gradient-dependent process. Transport of ions was assumed to be slowed by the accumulation of mineral in the matrix along the transport path. ne model also mimics bone apposition, slowing of apposition during refilling, and mineralization lag time. It was found that simple diffusion cannot account for the transport of calcium ions into mineralizing bone, because the diffusion coefficient is two orders of magnitude too low. If a more rapid concentration gradient-driven means of transport exists, the model demonstrates that osteonal geometry and variable rate of refilling work together to produce calcification halos, as well as the primary and secondary calcification effect reported in the literature.

  1. 43 CFR Appendix F to Part 2 - Mineral Leasing Act and Mineral Leasing Act for Acquired Lands-Special Rules

    Science.gov (United States)

    2010-10-01

    ... 43 Public Lands: Interior 1 2010-10-01 2010-10-01 false Mineral Leasing Act and Mineral Leasing... 2—Mineral Leasing Act and Mineral Leasing Act for Acquired Lands—Special Rules (a) Definitions. As... conduct coal exploration operations on land subject to the Mineral Leasing Act, under 30 U.S.C. 201(b),...

  2. Rheology of unstable mineral emulsions

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    Sokolović Dunja S.

    2013-01-01

    Full Text Available In this paper, the rheology of mineral oils and their unstable water emulsion were investigated. The oil samples were domestic crude oil UA, its fractions UA1, UA4 and blend semi-product UP1, while the concentration of oil in water emulsions was in the range from 1 up to 30%. The results were analyzed based on shear stress. The oil samples UA, UA1 and UP1 are Newtonian fluids, while UA4 is pseudoplastic fluid. The samples UA and UA4 show higher value of shear stress (83.75 Pa, 297 Pa, then other two samples UA1 and UP1 (18.41 Pa, 17.52 Pa. Rheology of investigated oils due to its complex chemical composition should be analyzed as a simultaneous effect of all their components. Therefore, structural composition of the oils was determined, namely content of paraffins, naphthenes, aromatics and asphaltenes. All samples contain paraffins, naphthenes and aromatics but only oils UA and UA4 contain asphaltenes as well. All investigated emulsions except 30% EUA4 are Newtonian fluids. The EUA4 30% emulsion shows pseudoplastic behaviour, and it is the only 30% emulsion among investigated ones that achieves lower shear stress then its oil. The characteristics of oil samples that could have an influence on their properties and their emulsion rheology, were determined. These characteristics are: neutralization number, interfacial tension, dielectric constant, and emulsivity. Oil samples UA and UA4 have significantly higher values of neutralization number, dielectric constants, and emulsivity. The sample UA has the lowest value of interface tension and the greatest emulsivity, indicating that this oil, among all investigated, has the highest preference for building emulsion. This could be the reason why 20% and 30% emulsions of the oil UA achieve the highest shear stress among all investigated emulsions.

  3. Analgesia e sedacao durante a instalacao do cateter central de insercao periferica em neonatos

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    Priscila Costa

    2013-08-01

    Full Text Available Objetivou-se caracterizar as estratégias de analgesia e sedação em neonatos submetidos à instalação do cateter central de inserção periférica (CCIP e relacioná-las ao número de punções venosas, duração do procedimento e posicionamento da ponta do cateter. Estudo transversal com coleta prospectiva de dados, realizado em uma unidade de cuidados intensivos neonatais de um hospital privado na cidade de São Paulo, no período de 31 de agosto de 2010 a 01 de julho de 2011, em que foram avaliadas 254 inserções do CCIP. A adoção de estratégias analgésicas ou sedativas ocorreu em 88 (34,6% instalações do cateter e não esteve relacionada ao número de punções venosas, duração do procedimento ou posicionamento da ponta do cateter. As estratégias mais frequentes foram a administração endovenosa de midazolam em 47 (18,5% e fentanil em 19 (7,3% inserções do cateter. Recomenda-se maior adoção de estratégias analgésicas antes, durante e após o procedimento.

  4. Actividad sísmica en Costa Rica durante el 2012

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    Lepolt Linkimer

    2013-12-01

    Full Text Available Durante el 2012 la Red Sismológica Nacional (RSN: UCR-ICE registró 3455 sismos locales de los cuales 260 sismos fueron sentidos por la población. Esta alta sismicidad se relaciona con la ocurrencia del terremoto de Sámara del 5 de setiembre (Mw 7,6, sus réplicas y la sismicidad inducida en otras fuentes sísmicas. Se percibieron en total 12 sismos con magnitudes ≥ 5,0. La mayoría (90% de los sismos percibidos fueron superficiales (< 30 km y el 56% tuvo una magnitud baja (Mw 3,0-3,9. El proceso de subducción de la placa del Coco bajo la placa Caribe y la microplaca de Panamá originó el 53% de los sismos sentidos. Un 45% fueron originados por fallas locales principalmente en el Valle Central, Isla Calero y Coto Brus. La intensidad máxima observada en el 2012 fue de VII (Mercalli Modificada, MM para la zona de la península de Nicoya y Zarcero-Naranjo debido al terremoto de Sámara. Además, ocurrieron ocho sismos que ocasionaron intensidades de hasta V (MM.

  5. Qualidade de sementes de tabaco durante o processo de pelotização e armazenamento

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    Carla Massimo Caldeira

    2016-02-01

    Full Text Available RESUMO: O processo de pelotização pode afetar a qualidade das sementes por ocasião da semeadura, por isso, para avaliar o efeito desse processo na qualidade das sementes, foram utilizadas sementes de duas cultivares de tabaco 'CSC 467' e 'CSC 07', coletadas em diferentes etapas do processo de beneficiamento e pelotização: 1 sementes nuas não beneficiadas; 2 sementes nuas beneficiadas; 3 sementes pelotizadas; 4 sementes pelotizadas e coloridas. Para avaliação da qualidade das sementes nessas diferentes etapas, foram realizados os seguintes testes: germinação, primeira contagem de germinação, índice de velocidade de germinação, teste de emergência e índice de velocidade de emergência. Posteriormente, as sementes foram armazenadas por seis e doze meses e sua qualidade avaliada pelos mesmos testes e determinações. O processo de pelotização avaliado não influencia na germinação final de sementes de tabaco, mas atrasa o processo germinativo. As sementes de tabaco das cultivares 'CSC 467' e 'CSC 07' mantêm sua qualidade durante os 12 meses de armazenamento em câmara fria, com temperatura de 10°C e umidade relativa de 50%.

  6. Durante la administración de rojas pinilla 1953 a 1957

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    William Pacheco Vargas

    2007-01-01

    Full Text Available Este artículo, se basa en el proyecto de investigación sobre la evolución de las finanzas de la Universidad Pedagógica de Colombia en Tunja, durante los años de gobierno del tunjano, Teniente General Gustavo Rojas Pinilla. Se analiza así mismo, los antecedentes y disposiciones presupuestales, el origen de los ingresos recaudados y el destino de los mismos y el impacto en el desarrollo institucional especialmente en las nuevas dependencias y en las ya existentes, incorporadas con motivo de su creación; medible a través de la participación en el gasto ejecutado.Lo que finalmente, permite establecer el balance financiero de la institución. A manera de conclusión, se determina el costo real promedio por estudiante para cada año en la Sección Universitaria. En los años de 1955 y 1957, se comparan las dependencias, la proporción de estudiantes, el presupuesto ejecutado, el costo por alumno, el número de docentes y empleados, y los correspondientes índices de crecimiento. De esta manera, se calcula el costo por escolar para toda la institución, sin importar el nivel de enseñanza de la misma; confrontando los datos con los cálculos hechos por ASCUN-FUN.

  7. El proceso de reforma administrativa de la renta del Tabaco en Navarra durante el siglo XVIII

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    Sergio Solbes Ferri

    2013-11-01

    Full Text Available El presente artículo está centrado en la evolución de la gestión administrativa del monopolio fiscal del tabaco en Navarra durante la centuria dieciochesca. Su inicio se sitúa en el arrendamiento del estanco en 1717 por el Gobierno central a la Hacienda foral de Navarra -propietaria del mismo desde su creación en 1642- y analiza las sucesivas fases a través de las cuáles dicha administración central fue progresivamente adquiriendo el control absoluto de la renta en este territorio.The present paper is specially based in the evolution of the administration of the tobacco state monopoly in the Kingdom of Navarre during the eighteen century. We start in the lease of the income in 1717 to his old owner (the Foral Administration since 1642 and analyse the following phases through the Central Government was getting the control of the monopoly in this territory.

  8. Respuestas de elección durante el contraste negativo sucesivo consumatorio en ratas

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    Florencia López Seal

    2010-01-01

    Full Text Available En ratas, el cambio de una solución preferida (aguaazucarada al 32% por otra menos preferida (aguaazucarada al 4% produce una caída del consumopor debajo de un grupo control no devaluado, elcual siempre recibe acceso a la solución de valorbajo. Este fenómeno denominado contraste negativosucesivo consumatorio ocurre incluso cuandola devaluación coincide con cambios en las clavesambientales o gustativas y cuando hay múltiplesopciones de respuesta (con el reforzador de valorbajo disponible en varios lugares. En este artículose presenta un experimento donde un grupo de ratasse entrenó en la fase pre-cambio con una soluciónpreferida con sabor a almendra (32%A y otro conuna menos preferida (4%A. La fase post-cambio serealizó en un contexto distinto y novedoso, dondetodos los animales pudieron elegir entre consumir4% o 4%A. Se observó un efecto de contrastenegativo en los animales que experimentaron ladevaluación y una preferencia por la solución conel sabor a almendra utilizado durante la fase precambioen los sujetos de ambos grupos.

  9. Patrimonio familiar e infortunios financieros del linaje de los Castellví durante el siglo XVII

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    Amparo FELIPO ORTS

    2014-12-01

    Full Text Available La rama del linaje valenciano de los Castellví iniciada a principios del quinientos por el señor de Puchol protagonizó durante el siglo XVII un significativo proceso de acumulación patrimonial. En el origen del mismo se sitúan las adquisiciones realizadas por los sucesivos miembros que lo encabezaron, pero tan importante como ello resultó la estrategia matrimonial de los titulares del linaje, el reducido número de hijos y la reversión a la línea principal de legados de los miembros de la familia que no contrajeron matrimonio o fallecieron sin descendencia. En contrapartida, diversos factores se conjugaron para provocar un endeudamiento progresivo, especialmente acusado desde la década de 1670 en que herencia y deudas se anudaron en permanente complicidad. Analizar los pormenores de este doble proceso y su repercusión para la Casa constituye el objetivo de este trabajo.

  10. Clima y sociedad en Argentina y Chile durante el periodo colonial

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    Margarita Gascón

    2013-03-01

    Full Text Available El artículo analiza las principales fluctuaciones climáticas globales en algunos territorios, que actualmente pertenecen a las repúblicas de Argentina y de Chile, durante el periodo colonial. Las colonias involucradas son Santiago, en Chile; y Mendoza, Córdoba y Buenos Aires, en Argentina. El periodo colonial inicia con la Pequeña Edad Glacial y sus condiciones de mayor frío y humedad; a mediados del siglo XVII fue notorio el Mínimo de Maunder; y, finalmente, en la segunda mitad del siglo XVIII, se registró el Remonte Termal, caracterizado por el calor y la sequía. Prestamos atención a El Niño Oscilación del Sur (ENOS en sus diferentes efectos locales. El objetivo principal es enriquecer las interpretaciones del pasado desde finales del siglo XVI hasta principios del siglo XIX, al aportar elementos referidos a la historia del clima. El eje del análisis es que el clima afecta los ambientes y los recursos naturales disponibles, la vida urbana y las rutas, de modo que no puede estar ausente de las diversas explicaciones del pasado colonial.

  11. LA EDUCACIÓN FEMENINA EN LA INDIA DURANTE LA ÉPOCA COLONIAL

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    Alejandra Val Cubero

    2010-01-01

    Full Text Available El sistema de educación femenina en la India es un legado del colonialismo británico puesto en funcionamiento por las misioneras y por los grupos de reformistas indios a mediados del siglo XIX. Las misioneras trataron de propagar la religión cristiana a través de la educación y los reformistas abogaron por una educación siguiendo las tradiciones indias de respeto y sumisión, donde la espiritualidad y la sensibilidad no sólo diferenciaba las mujeres indias de las que no lo eran, también a las mujeres de las castas superiores de otras castas que no podían acceder a la enseñanza formal. Este artículo surgió durante mi estancia en la universidad de Jawahalhal Nehru en Delhi donde pude visitar instituciones educativas como el Victorian Institution. El método de investigación es el genealógico: retraernos al pasado para ver los cambios y transformaciones en los procesos sociales y educativos con el fin de comprender el presente. En la actualidad realizo un estudio sobre la educación femenina en la India en el siglo XXI.

  12. Estabilidade locomotora durante a condução de um cão

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    Bruna Carla Périco

    2013-09-01

    Full Text Available O objetivo deste trabalho foi avaliar a influência da percepção háptica na estabilidade locomotora do ser humano durante a condução de um cão com uma guia. Adultos (n=14, com e sem restrição da visão, andaram sobre uma trave de equilíbrio sozinhos, ou, com uma guia, andaram conduzindo um cão sobre um banco estreito ao lado. Quando os participantes caminharam conduzindo o cão, privados da visão, o desempenho locomotor-avaliado através da duração do deslocamento total, da duração das passadas, das fases de duplo suporte e balanço, do comprimento e velocidade das passadas, assim como da variabilidade da fase relativa-melhorou significativamente (p < 0,05 em relação ao desempenho locomotor na condição sem o cão. Nas condições com visão, conduzir o cão não resultou em mudanças nestas variáveis. Concluímos que estes indivíduos foram capazes de utilizar a guia do cão para detectar propriedades hápticas com propósito de melhorar a estabilidade na locomoção.

  13. O SUPORTE SOCIAL DURANTE A TRANSIÇÃO FAMILIAR NO PÓS-DESASTRE NATURAL

    Directory of Open Access Journals (Sweden)

    Gisele Cristina Manfrini Fernandes

    2013-01-01

    Full Text Available Investigación cualitativa de base analítica-interpretativa que tuvo como objetivo presentar las percepciones de las familias sobre el soporte social en la transición del postdesastre natural. Fueron entrevistados seis núcleos familiares residentes en una localidad rural del Sur del Brasil, y que fue afectada por un desastre natural en el año 2008. Los datos fueron obtenidos en el 2010, a partir de la observación participativa, entrevista narrativa, genograma y ecomapa. Las narraciones obtenidas fueron analizadas siguiendo las etapas del método de Fritz Schütze. Los resultados revelan la ayuda recibida durante la fase de transición, la falta de ayuda esperada, el soporte emocional de familiares y amigos y los recursos recordados por las familias en sus ecomapas, los cuales tuvieron una importancia fundamental para la fase inicial de recuperación postdesastre. El estudio contribuye para la comprensión del contexto de recuperación de las familias y destaca la pertinencia del soporte social como un medio de enfrentar los cambios.

  14. OBTENCIÓN DE FRACCIONES ENRIQUECIDAS DURANTE LA EXTRACCIÓN DE ACEITES ESENCIALES CRUDOS

    Directory of Open Access Journals (Sweden)

    María S. Guala

    2012-01-01

    Full Text Available La destilación por arrastre con vapor es uno de los métodos más utilizados para la obtención de aceite esencial crudo (AEC. Muchas aplicaciones requieren fracciones de AEC, enriquecidas en un componente o grupo de ellos, para lo cual se utiliza destilación al vacío. En este trabajo se propone realizar un fraccionamiento del aceite esencial crudo (AEC durante el proceso de extracción por destilación con arrastre de vapor, para lo cual se colectaron distintos cortes, en lugar de una única mezcla final que es la metodología tradicionalmente utilizada. Las experiencias se llevaron a cabo utilizando frutos, hojas y tallos de aguaribay (Schinus molle L.. La composición de las distintas muestras obtenidas se determinó por cromatografía gaseosa acoplada a espectroscopía de masas. Los resultados muestran diferentes componentes (y concentraciones para los diferentes cortes, lo que indica que se puede lograr una apreciable separación utilizando esta metodología.

  15. Los hogares latinoamericanos durante la segunda mitad del siglo XX: una perspectiva sociodemográfica

    Directory of Open Access Journals (Sweden)

    Brígida García

    2002-01-01

    Full Text Available El objetivo de este trabajo es analizar los cambios sociodemográficos más significativos ocurridos en los hogares latinoamericanos durante la segunda mitad del siglo xx. Para ello se tienen en cuenta dos aspectos fundamentales: la posible convergencia hacia las familias pequeñas y nucleares; y la naturaleza e incremento de los hogares con jefatura femenina. Se intenta no sólo sintetizar el conocimiento existente sobre dichos temas, sino también dar cuenta de las conexiones entre los cambios sociodemográficos de los hogares y la desigualdad social y de género persistente en América Latina. Algunas de las principales conclusiones son: a A pesar de la existencia de un claro proceso de nuclearización en los hogares latinoamericanos, la importancia de los arreglos familiares de tipo extendido continúa siendo distintiva del sistema familiar en la región, especialmente entre la población de escasos recursos; y b los hogares encabezados por mujeres muestran un claro incremento, y posiblemente éste se aprecie en diversos sectores de nuestras sociedades.

  16. Alianzas y traiciones en la pampa rioplatense durante el siglo XVIII

    Directory of Open Access Journals (Sweden)

    Gabriel Taruselli

    2010-01-01

    Full Text Available El presente trabajo tiene como escenario la región pampeana del Río de la Plata durante la segunda mitad del siglo XVIII. En 1770 fue arrestado allí un indio llamado Flamenco. Remitido a la cárcel de Buenos Aires, el gobernador Vértiz dispuso inmediatamente una serie de diligencias para saber qué hacer con él. El expediente que entonces se formó contiene la opinión de los principales personajes de la campaña bonaerense y la declaración del propio Flamenco. Su análisis nos permite describir el mundo rural colonial rioplatense y las estrategias desplegadas por los españoles para controlar un territorio donde grupos indígenas mantuvieron su autonomía hasta mediados del siglo XIX. Para ampliar la información se relevaron fuentes documentales éditas e inéditas, conservadas en el Archivo General de la Nación, Argentina.

  17. Las visitas de inspección a la ciudad de Valencia durante el siglo XVI

    Directory of Open Access Journals (Sweden)

    Amparo FELIPO

    2009-12-01

    Full Text Available RESUMEN: Las visitas, como procedimiento de control de la gestión de gobierno y administración municipal, constituyeron una constante en la ciudad de Valencia bajo los dos Austrias mayores. Iniciadas por orden de Carlos V inmediatamente después de las Germanías, tuvieron continuidad durante todo su reinado en las encomendadas sucesivamente a Pedro de La Gasea, al racional Granulles, al obispo de Elna, a Hernán Pérez y a Diego de Cardona. Y fueron reanudadas bajo Felipe II con la encargada a Pedro Clavero y Juan Antonio de Ancora, proseguida por Agustín Gallart y Jerónimo Arrufat, en el contexto de la crisis financiera de la década de los sesenta.ABSTRACT: The visits, as procedure of control of government's measures and municipal administration, constituted a constant in the city of Valencia under the two bigger Austrias. Begun immediately by order of Carlos V after the Germanías, they had continuity during all their reigned in those commended Pedro de La Gasea successively, to the rational Granulles, to the bishop of Elna, to Hernán Pérez and to Diego de Cardona. And they were renewed under Felipe II with the one in charge to Pedro Clavero and Juan Antonio de Ancora, continued by Agustín Gallart and Jerónimo Arrufat, in the context of the financial crisis of the sixty decade.

  18. Salud publica impulsada por el Cabildo de Lima durante la Colonia

    Directory of Open Access Journals (Sweden)

    Paula Ermila Rivasplata

    2014-08-01

    Full Text Available Durante la Colonia, Lima era una ciudad con un hacinamiento que generaba todo tipo de basura y tenía problemas de disposición final de residuos sólidos, líquidos y gaseosos. El objetivo de este artículo es conocer desde una perspectiva cultural, a partir de las actas capitulares y fuentes secundarias, la activa participación del cabildo en la salud pública de la ciudad. El estudio permite descubrir un cabildo dedicado a la prevención de enfermedades, el control sanitario, el abastecimiento de la ciudad e incluso a la conservación de sus recursos. Así, los regidores supervisaban a través de comisiones los mercados, carnicerías, mataderos, molinos, panaderías, tenerías, pulperías y boticas. Sin embargo, estos y otros esfuerzos nunca fueron suficientes para mantener la ciudad limpia y libre de epidemias. 

  19. Papel da gastroplastia no tratamento da apnéia obstrutiva durante o sono

    Directory of Open Access Journals (Sweden)

    Rubens Reimão

    1986-03-01

    Full Text Available Gastroplastia foi realizada como forma terapêutica auxiliar para redução de peso em 4 pacientes com obesidade severa e apnéia obstrutiva durante o sono (ASO. As idades variavam de 31 a 54 anos e todos eram do sexo masculino. Em três casos a gastroplastia acompanhou-se de traqueostomia. Após a gastroplastia todos tiveram melhora da sonolência diurna e redução de peso em 16,7% a 40,9%. Avaliações polissonográficas de noite inteira realizadas no pré e pós-operatório (3-4 meses. Os registros pós-operatórios foram feitos com traqueostomia fechada e revelaram redução da freqüência das apnéias e aumento dos estágios 3, 4 e REM. Normalização dos índices de saturação arterial de oxigênio (Sa0(2 foi constatada em três dos 4 casos. Esses dados sugerem que a gastroplastia pode ser utilizada como forma alternativa para redução de peso em casos selecionados de ASO complementando outros procedimentos cirúrgicos como a traqueostomia.

  20. Breve historia de los refugiados en Argentina durante el siglo XX

    Directory of Open Access Journals (Sweden)

    María Paula Cicogna

    2009-12-01

    Full Text Available Argentina ha sostenido, desde la letra escrita de la Constitución Nacional, ser un país receptor de inmigración, aunque en los hechos ha demostrado lo contrario. A pesar de ello, durante el siglo XX se instalaron grupos de exiliados, solicitantes de refugio y refugiados de las más diversas nacionalidades. Este artículo mostrará los contingentes que conformaron el mapa multicultural de la Argentina a partir del desarrollo de una cronología creada a en base a los trabajos de investigación que analizaron el establecimiento de las diversas comunidades._________________ABSTRACT:According to National Constitution Argentina has been an open doors country to immigration, although it has demonstrated the opposite. In spite of it, during XX century groups of exiles, asylum seekers and refugees of different nationalities settled in the country. Based in a chronology created from varied researches which analyzed the establishment of the diverse communities this article will show the groups that shape the multicultural map of Argentina.

  1. Las sequías en México durante el siglo XIX

    Directory of Open Access Journals (Sweden)

    Carlos Contreras Servín

    2005-01-01

    Full Text Available A lo largo de la historia, la sequía ha sido vista como un fenómeno errático e imprevisible que constituye una desviación respecto a los valores medios de precipitación a largo plazo y que se dan de un año a otro. Por consiguiente, una de las grandes preocupaciones de los climatólogos ha sido conocer las causas que determinan su frecuencia. Por tal motivo, esta investigación tiene como objetivo central relacionar los principales trabajos que se han realizado sobre las sequías en el siglo XIX. Posteriormente, se confrontan las conclusiones de estos autores con los registros meteorológicos y documentación sobre sequías localizados en el Archivo General de la Nación (AGN, lo cual permite establecer un marco de referencia sobre las grandes sequías regionales que se observaron en México durante esa época. El propósito final de este trabajo es sentar las bases que permitan conocer las grandes sequías en dicho siglo y su periodicidad.

  2. LA COLECTIVIDAD BRITÁNICA EN VALPARAÍSO DURANTE LA PRIMERA MITAD DEL SIGLO XX

    Directory of Open Access Journals (Sweden)

    BALDOMERO ESTRADA TURRA

    2006-06-01

    Full Text Available En este trabajo analizamos la importancia de la colectividad británica en el desarrollo económico de Valparaíso (Chile, pese a su limitada presencia, durante la primera mitad del siglo XX. Se hace notar el predominio de la colectividad el comercio internacional como también en la actividad industrial especialmente en aquellas que poseían un mayor desarrollo tecnológico. La disminución de la importancia económica y también demográfica de la colectividad británica en Valparaíso, a partir de la década de 1920, se relaciona directamente con la perdida de influencia británica, en nuestro Continente, luego de la Primera Guerra MundialIn this work we analyze the importance of the british immigrants in the economic development of Valparaiso during the first half of twenty century. We highlight their predominance in the international trade and in the industrial activity especially those that reveal a high technological development. The economic and demographic decline of the british immigrants from 1920 is in close relation with the lost of the british influence in Latin America after the First World War

  3. The DataMiner manager Web interface

    OpenAIRE

    Panichi, Giancarlo; Coro, Gianpaolo

    2016-01-01

    In this document we describe the DataMiner Manager Web interface that allows interacting with the gCube DataMiner service. DataMiner is a cross-usage service that provides users and services with tools for performing data mining operations. Specifically, it offers a unique access to perform data mining and statistical operations on heterogeneous data, which may reside either at client side, in the form of comma-separated values files, or be remotely hosted, possibly in a database. The DataMin...

  4. Ostwald ripening of clays and metamorphic minerals

    Science.gov (United States)

    Eberl, D.D.; Srodon, J.; Kralik, M.; Taylor, B.E.; Peterman, Z.E.

    1990-01-01

    Analyses of particle size distributions indicate that clay minerals and other diagenetic and metamorphic minerals commonly undergo recrystallization by Ostwald ripening. The shapes of their particle size distributions can yield the rate law for this process. One consequence of Ostwald ripening is that a record of the recrystallization process is preserved in the various particle sizes. Therefore, one can determine the detailed geologic history of clays and other recrystallized minerals by separating, from a single sample, the various particle sizes for independent chemical, structural, and isotopic analyses.

  5. World mineral exploration trends and economic issues

    International Nuclear Information System (INIS)

    The subjects and methodologies presented in this book vary from the presentation of a heretofore unavailable collection of data on worldwide mineral exploration to case studies of mineral exploration in the developing countries of Botswana and Papua New Guinea to a study of the economic productivity of base metal exploration in Australia and Canada. Some authors concentrate on particular actors or participants in the exploration process, such as major mining companies, while other focus on a particular country such as the Soviet Union, France, or South Africa. Most chapters deal with exploration for nonfuel minerals, and particularly metals, although some take in uranium and coal exploration; oil and gas exploration is specifically excluded

  6. Applications of electrochemical techniques in mineral analysis.

    Science.gov (United States)

    Niu, Yusheng; Sun, Fengyue; Xu, Yuanhong; Cong, Zhichao; Wang, Erkang

    2014-09-01

    This review, covering reports published in recent decade from 2004 to 2013, shows how electrochemical (EC) techniques such as voltammetry, electrochemical impedance spectroscopy, potentiometry, coulometry, etc., have made significant contributions in the analysis of minerals such as clay, sulfide, oxide, and oxysalt. It was discussed based on the classifications of both the types of the used EC techniques and kinds of the analyzed minerals. Furthermore, minerals as electrode modification materials for EC analysis have also been summarized. Accordingly, research vacancies and future development trends in these areas are discussed.

  7. Characterization of minerals, metals and materials

    CERN Document Server

    Hwang, Jiann-Yang; Bai, Chengguang; Carpenter, John; Cai, Mingdong; Firrao, Donato; Kim, Byoung-Gon

    2012-01-01

    This state-of-the-art reference contains chapters on all aspects of the characterization of minerals, metals, and materials. The title presents papers from one of the largest yearly gatherings of materials scientists in the world and thoroughly discusses the characterization of minerals, metals, and materials The scope includes current industrial applications and research and developments in the following areas:  Characterization of Ferrous Metals Characterization of Non-Ferrous Materials Characterization of Minerals and Ceramics Character

  8. Gold Rushes and mineral property rights allocation

    DEFF Research Database (Denmark)

    Sinding, Knud

    Even today, mineral property rights are allocated on what is essentially a first-come, first-serve or open access basis. Access to prospect and locate claims may be restricted in some areas such as national parks, but elsewhere a policy of open access is widely practised, albeit subject to a set...... influxes of prospectors competing for a very limited area. This paper charts significant gold rush events in the mineral industry in recent decades and uses preliminary data on the areas impacted by these gold rushes to argue that many mineral tenure systems should be modified in order to be better able...

  9. Biological degradation of heavy mineral soaps

    Energy Technology Data Exchange (ETDEWEB)

    Glombitza, F.; Iske, U.; Bullmann, M.

    1988-11-01

    The possibility of biological degradation is exemplified by a chemically highly resistant Zircon mineral of the heavy mineral soaps of the Baltic Sea, with the aid of Thiobacillus ferrooxidans and Acetobacter spec. strains. The total matrix of the mineral is dissolved and all trace elements contained are solubilized. The different mechanisms of the leaching reaction give different distributions of the dissolved compounds in the phases of the leaching system. Concerning the REE a selectivity based on their physical characteristics is observed. There is a preferential solution of the light REE as compared to the heavy REE. The conditions of use are discussed.

  10. Minería, geografía y sociedad en el río porce: amalfi y anorí entre 1850 y 1900.

    OpenAIRE

    Gómez Gómez, Mauricio Alejandro

    2011-01-01

    Los municipios de Amalfi y Anorí fueron establecidos a ambas orillas del río Porce, en el nordeste del departamento de Antioquia, a principios del siglo XIX y a mediados de ese siglo ya eran importantes centros de desarrollo de la región. Las nuevas técnicas de extracción del oro empleadas en la minería aurífera de aluvión y de veta, durante la segunda mitad del siglo XIX, produjeron un aumento significativo en su producción, transformado la vida económica y social de las dos localidades. Par...

  11. Sorption Energy Maps of Clay Mineral Surfaces

    International Nuclear Information System (INIS)

    A molecular-level understanding of mineral-water interactions is critical for the evaluation and prediction of the sorption properties of clay minerals that may be used in various chemical and radioactive waste disposal methods. Molecular models of metal sorption incorporate empirical energy force fields, based on molecular orbital calculations and spectroscopic data, that account for Coulombic, van der Waals attractive, and short-range repulsive energies. The summation of the non-bonded energy terms at equally-spaced grid points surrounding a mineral substrate provides a three dimensional potential energy grid. The energy map can be used to determine the optimal sorption sites of metal ions on the exposed surfaces of the mineral. By using this approach, we have evaluated the crystallographic and compositional control of metal sorption on the surfaces of kaolinite and illite. Estimates of the relative sorption energy and most stable sorption sites are derived based on a rigid ion approximation

  12. Effects of earthworms on nitrogen mineralization.

    NARCIS (Netherlands)

    Willems, J.J.G.M.; Marinissen, J.C.Y.; Blair, J.

    1996-01-01

    The influence of earthworms (Lumbricus terrestris and Aporrectodea tuberculata) on the rate of net N mineralization was studied, both in soil with intact soil structure (partly influenced by past earthworm activity) and in columns with sieved soil

  13. Mineral Resource Data System: Conterminous US

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — MRDS describes metallic and nonmetallic mineral resources throughout the world. Included are deposit name, location, commodity, deposit description, geologic...

  14. Sorption Energy Maps of Clay Mineral Surfaces

    Energy Technology Data Exchange (ETDEWEB)

    Cygan, Randall T.; Kirkpatrick, R. James

    1999-07-19

    A molecular-level understanding of mineral-water interactions is critical for the evaluation and prediction of the sorption properties of clay minerals that may be used in various chemical and radioactive waste disposal methods. Molecular models of metal sorption incorporate empirical energy force fields, based on molecular orbital calculations and spectroscopic data, that account for Coulombic, van der Waals attractive, and short-range repulsive energies. The summation of the non-bonded energy terms at equally-spaced grid points surrounding a mineral substrate provides a three dimensional potential energy grid. The energy map can be used to determine the optimal sorption sites of metal ions on the exposed surfaces of the mineral. By using this approach, we have evaluated the crystallographic and compositional control of metal sorption on the surfaces of kaolinite and illite. Estimates of the relative sorption energy and most stable sorption sites are derived based on a rigid ion approximation.

  15. NOAA and MMS Marine Minerals Geochemical Database

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Marine Minerals Geochemical Database was created by NGDC as a part of a project to construct a comprehensive computerized bibliography and geochemical database...

  16. Major mineral deposits of the world

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — Regional locations and general geologic setting of known deposits of major nonfuel mineral commodities. Originally compiled in five parts by diverse authors,...

  17. [Assessment of lipid profiles and bone mineral density in renal transplant patients].

    Science.gov (United States)

    Fernández Castillo, Rafael; Fernández Gallegos, Ruth; Peña Amaro, María Pilar; Esteban de la Rosa, Rafael José

    2015-06-01

    Introducción: las alteraciones del metabolismo lipídico y del metabolismo mineral óseo son trastornos frecuentes entre los pacientes trasplantados renales, lo que contribuye a la aparación de enfermedades matabólicas y cardiovasculares que ponen en peligro la integridad del injerto. Objetivo: describir y observar la evolución de las alteraciones de la densidad mineral ósea (DMO) y las alteraciones lipídicas en una población de pacientes trasplantados renales. Material y método: en este trabajo se ha seguido a 119 pacientes de ambos sexos trasplantados renales, a los cuales se les realizaron mediciones pretrasplante y postrasplante durante cinco años de parámetros bioquímicos, mediciones antropométricas y de la densidad mineral ósea en columna lumbar, fémur y radio-cubital. Resultados: durante los cinco años tras el trasplante se produce un importante aumento de parámetros bioquímicos, IMC, dislipemia, diabetes e hipertensión arterial. A los seis meses existe un alto porcentaje de pacientes con DMO patológica, aumentando un 4,1% al año del trasplante. Conclusiones: tras el trasplante se produce un gran incremento de la hiperlipidemia que se asocia con un patrón característico de alteración de lípidos con elevación del colesterol total, lipoproteínas de baja densidad, lipoproteínas de alta densidad, así como el consiguiente aumento de los triglicéridos, a pesar del tratamiento con estatinas, lo que conlleva un aumento en los factores de riego de padecer diabetes, hipertension arterial y enfermedades cardiovasculares; además se produce una pérdida de masa ósea, lo que conlleva un alto riesgo de sufrir fracturas graves, poniendo en peligro el injerto renal y la calidad de vida del paciente.

  18. Surface geochemistry of the clay minerals

    OpenAIRE

    Sposito, Garrison; Skipper, Neal T.; Sutton, Rebecca; Park, Sung-Ho; Soper, Alan K.; Greathouse, Jeffery A.

    1999-01-01

    Clay minerals are layer type aluminosilicates that figure in terrestrial biogeochemical cycles, in the buffering capacity of the oceans, and in the containment of toxic waste materials. They are also used as lubricants in petroleum extraction and as industrial catalysts for the synthesis of many organic compounds. These applications derive fundamentally from the colloidal size and permanent structural charge of clay mineral particles, which endow them with significant ...

  19. Cyanobacteria as Biocatalysts for Carbonate Mineralization

    OpenAIRE

    Christer Jansson; Ajo-Franklin, Caroline M.; Kamennaya, Nina A.; Trent Northen

    2012-01-01

    Microbial carbonate mineralization is widespread in nature and among microorganisms, and of vast ecological and geological importance. However, our understanding of the mechanisms that trigger and control processes such as calcification, i.e., mineralization of CO2 to calcium carbonate (CaCO3), is limited and literature on cyanobacterial calcification is oftentimes bewildering and occasionally controversial. In cyanobacteria, calcification may be intimately associated with the carbon dioxide-...

  20. Metals, minerals and microbes: geomicrobiology and bioremediation.

    Science.gov (United States)

    Gadd, Geoffrey Michael

    2010-03-01

    Microbes play key geoactive roles in the biosphere, particularly in the areas of element biotransformations and biogeochemical cycling, metal and mineral transformations, decomposition, bioweathering, and soil and sediment formation. All kinds of microbes, including prokaryotes and eukaryotes and their symbiotic associations with each other and 'higher organisms', can contribute actively to geological phenomena, and central to many such geomicrobial processes are transformations of metals and minerals. Microbes have a variety of properties that can effect changes in metal speciation, toxicity and mobility, as well as mineral formation or mineral dissolution or deterioration. Such mechanisms are important components of natural biogeochemical cycles for metals as well as associated elements in biomass, soil, rocks and minerals, e.g. sulfur and phosphorus, and metalloids, actinides and metal radionuclides. Apart from being important in natural biosphere processes, metal and mineral transformations can have beneficial or detrimental consequences in a human context. Bioremediation is the application of biological systems to the clean-up of organic and inorganic pollution, with bacteria and fungi being the most important organisms for reclamation, immobilization or detoxification of metallic and radionuclide pollutants. Some biominerals or metallic elements deposited by microbes have catalytic and other properties in nanoparticle, crystalline or colloidal forms, and these are relevant to the development of novel biomaterials for technological and antimicrobial purposes. On the negative side, metal and mineral transformations by microbes may result in spoilage and destruction of natural and synthetic materials, rock and mineral-based building materials (e.g. concrete), acid mine drainage and associated metal pollution, biocorrosion of metals, alloys and related substances, and adverse effects on radionuclide speciation, mobility and containment, all with immense social

  1. World Mineral Production 2002-06

    OpenAIRE

    Hetherington, Linda; Brown, Teresa; Benham, Antony; Bide, Tom; Lusty, Paul; Hards, Vicky; Hannis, Sarah; Idoine, Naomi

    2008-01-01

    This publication includes five year tables of production, by country, for the majority of economically important mineral commodities, including ferrous and non-ferrous metals, industrial minerals and hydrocarbons. Additional information has been added describing the characteristics, uses production trends, prices and industry events for 11 commodities including bauxite/alumina/aluminium, coal, copper, fluorspar, gold, iron ore, lead, nickel, titanium, uranium and zinc. This is part ...

  2. Riqueza Mineral Y Pobreza En Los Andes

    OpenAIRE

    Leonith Hinojosa

    2011-01-01

    This article examines the paradox found in mineral-rich Andean countries where the sustained economic growth observed over the last decade has not provoked a corresponding decrease in poverty. The impact of the expansion of the extractive industries (mining and hydrocarbons) on these countries is addressed from the perspective of political economy, indicating that the permanence of poverty, in particular rural poverty in areas where mineral wealth is concentrated, can be explained by inconsis...

  3. Industrial mineral powder production in China

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The recent annual output of major industrial mineral powders in the mainland of China has been more than 100 million t, accompanied by active development of such supporting technology as comminution, classification, separation/purification, and surface modification. In particular, the present paper reviews technologies for preparing ultra-fine particles involving dry and wet processing, modification and composition, calcination of kaolin clay, and processing of spherical/acerous industrial minerals.

  4. Magnetic Separation of Weakly Magnatic Copper Minerals

    OpenAIRE

    Agricola, J. N.M.; Top, J. L.; Fort, A. F.

    1989-01-01

    High Gradient Magnetic Separation of small (5-38 µm) weakly magnetic copper mineral particles from a copper concentrate and ore has been performed. In previous work coarser fractions of these minerals, bornite and chalcopyrite, were separated successfully. The recovery of the smaller particles in the magnetic fraction decreases but their grade increases compared to the results obtained on the larger particles. At a magnetic background field of 1.3 T the concentrate was upgraded from 72% borni...

  5. Exploring data with RapidMiner

    CERN Document Server

    Chisholm, Andrew

    2013-01-01

    A step-by-step tutorial style using examples so that users of different levels will benefit from the facilities offered by RapidMiner.If you are a computer scientist or an engineer who has real data from which you want to extract value, this book is ideal for you. You will need to have at least a basic awareness of data mining techniques and some exposure to RapidMiner.

  6. Infrared Extinction Spectra of Mineral Dust Aerosol

    Science.gov (United States)

    Kleiber, P.; Laskina, O.; Alexander, J. M.; Young, M.; Grassian, V. H.

    2012-12-01

    Mineral dust aerosol affects the atmosphere by absorbing and scattering radiation and plays an important role in the Earth's radiative budget. The effect of atmospheric dust on climate is studied by various remote sensing techniques that use measurements from narrow band IR channels of satellites to determine key atmospheric properties. Therefore, it is essential to take radiative effects of mineral dust aerosol into account to correctly process remote sensing data. As aerosols are transported through the atmosphere they undergo aging and heterogeneous chemistry. This leads to changes in their optical properties and their effects on climate. In this study we carried out spectral simulations using both Mie theory and solutions derived in the Rayleigh regime for authentic dust samples and several processed components of mineral dust. Simulations of the extinction based on Mie theory shows that it does not accurately reproduce the peak position and band shape of the prominent IR resonance features. Errors in the simulated peak position and the line shape associated with Mie theory can adversely affect determination of mineral composition based on IR satellite data. Analytic solutions for various shapes derived from Rayleigh theory offer a better fit to the major band features of the spectra, therefore the accuracy of modeling atmospheric dust properties can be improved by using these analytic solutions. It is also important to take aging of mineral dust into account. We investigated the effect of chemical processing on the optical properties. It was shown that interactions of components of mineral dust (calcite, quartz and kaolinite) with humic and organic acids cause a shift of the IR resonance bands of these minerals. It may indicate changes in shape of the particles as well as changes in hygroscopicity and, as the result, the water content in these samples. Therefore, care should be taken when modeling optical properties of aged mineral dust.

  7. The Global Flows of Metals and Minerals

    Science.gov (United States)

    Rogich, Donald G.; Matos, Grecia R.

    2008-01-01

    This paper provides a preliminary review of the trends in worldwide metals and industrial minerals production and consumption based on newly developed global metals and minerals Material Flow Accounts (MFA). The MFA developed encompass data on extraction and consumption for 25 metal and mineral commodities, on a country-by-country and year-by-year basis, for the period 1970 to 2004. The data-base, jointly developed by the authors, resides with the U.S. Geological Survey (USGS) as individual commodity Excel workbooks and within a Filemaker data management system for use in analysis. Numerous national MFA have been developed to provide information on the industrial metabolism of individual countries. These MFA include material flows associated with the four commodity categories of goods that are inputs to a country's economy, agriculture, forestry, metals and minerals, and nonrenewable organic material. In some cases, the material flows associated with the creation and maintenance of the built infrastructure (such as houses, buildings, roads, airports, dams, and so forth) were also examined. The creation of global metals and industrial minerals flows is viewed as a first step in the creation of comprehensive global MFA documenting the historical and current flows of all of the four categories of physical goods that support world economies. Metals and minerals represent a major category of nonrenewable resources that humans extract from and return to the natural ecosystem. As human populations and economies have increased, metals and industrial minerals use has increased concomitantly. This dramatic growth in metals and minerals use has serious implications for both the availability of future resources and the health of the environment, which is affected by the outputs associated with their use. This paper provides an overview of a number of the trends observed by examining the database and suggests areas for future study.

  8. Minerals from the Pohorje igneous massif

    Directory of Open Access Journals (Sweden)

    Nina Zupančič

    1995-12-01

    Full Text Available The mineralogical composition of Pohorje igneous rocks was determined by means of optical microscopy and X-ray poviwder diffraction. Quartz, plagioclases and K-feldspars are the major minerals in the granodiorite and its porphyritic varieties. Characteristic and accessory minerals are biotite, hornblende, apatite, orthite, epidote, zircon and opaque minerals. Muscovite, pyroxenes and garnets occur rarely. The major minerals in malchites are plagioclases and hornblende.Restitic crystals of plagioclases, apatite and zircon were present in magma from which the Pohorje igneous body solidified. Sulphides, apatite and zircon precipitated in the first stage of magma crystallisation. In the next stage orthite, epidote and sphene crystallized. Biotite crystals probably formed slightly beforehornblende. The precipitation continued with plagioclases, quartz of first generation, more acid plagioclases, biotite and quartz of second generation. The crystallisation sequence ended with K-feldspar that replaced other minerals.The primary minerals are somewhere autometamorphosed to chlorite, epidote, calcite, sphene, sericite, kaolinite and limonite. In some areas in the NW part of Pohorje igneous body the alteration was hydrothermal.

  9. Mineral resources in Afghanistan. Final report

    International Nuclear Information System (INIS)

    Despite Afghanistan's wide variety of mineral resources and long history of small-scale mining of gems, gold, copper, and coal, it was not until the 1950's that the country's mineral resources were subject to systematic exploration. The report documents the past and present status of these resources and examines alternative strategies for their exploitation. Chapter 2 provides a brief history of minerals exploration, exploitation, and planning in Afghanistan, including the roles of Great Britain, France, Germany, the Soviet bloc, and the United States in Afghanistan's mineral sector; mineral policy in the five national plans during the years 1962-83; and sector assessments conducted by the World Bank (1978) and the US Department of Energy (1989). Chapter 3 discusses three strategies for developing the country's mineral and hydrocarbon resources. (1) a national orientation focusing on domestic needs; (2) a regional strategy that would consider markets in countries close to Afghanistan; and (3) an international strategy that would place Afghan resources on the international market

  10. Thin Ice Films at Mineral Surfaces.

    Science.gov (United States)

    Yeşilbaş, Merve; Boily, Jean-François

    2016-07-21

    Ice films formed at mineral surfaces are of widespread occurrence in nature and are involved in numerous atmospheric and terrestrial processes. In this study, we studied thin ice films at surfaces of 19 synthetic and natural mineral samples of varied structure and composition. These thin films were formed by sublimation of thicker hexagonal ice overlayers mostly produced by freezing wet pastes of mineral particles at -10 and -50 °C. Vibration spectroscopy revealed that thin ice films contained smaller populations of strongly hydrogen-bonded water molecules than in hexagonal ice and liquid water. Thin ice films at the surfaces of the majority of minerals considered in this work [i.e., metal (oxy)(hydr)oxides, phyllosilicates, silicates, volcanic ash, Arizona Test Dust] produced intense O-H stretching bands at ∼3400 cm(-1), attenuated bands at ∼3200 cm(-1), and liquid-water-like bending band at ∼1640 cm(-1) irrespective of structure and composition. Illite, a nonexpandable phyllosilicate, is the only mineral that stabilized a form of ice that was strongly resilient to sublimation in temperatures as low as -50 °C. As mineral-bound thin ice films are the substrates upon which ice grows from water vapor or aqueous solutions, this study provides new constraints from which their natural occurrences can be understood. PMID:27377606

  11. Mineral oxide transformation of antimicrobial contaminants

    Science.gov (United States)

    Guo, B.; Kendall, T. A.

    2008-12-01

    The quality of our water supply is dependent on the organic-mineral interface. Organics contain reactive groups that dissolve minerals, and release surface associated contaminants into aquifers and reservoirs. Conversely, minerals may transform organic pollutants, including antimicrobial drugs that are potentially deleterious to aquatic ecosystems or human health. Under aqueous conditions typical of soils and natural waters, the antibiotic agent sulfamethoxazole (SMX) is transformed in the presence of pyrolusite, presumably on the MnO2 surface. At least 50 percent loss of SMX was observed after 269 h, in both acidic and basic solutions (pH 3-9). Nearly 100 percent loss is recorded at pH 3 and 66 percent loss was recorded at circumneutral pH. Initial mass spectrometry of the reaction products suggests an oxidative pathway where hydroxylation and oxidation occurs at the aniline moiety and isoxazolamine ring of SMX. Concomitant increases in aqueous manganese concentrations suggest reductive transformation of the mineral surface. Ongoing electric force spectroscopy and force microscopy experiments probe potential mineral surface alteration associated with the SMX-MnO2 reaction. Coupling bulk aqueous observations and mass spectrometry with molecular-scale force microscopy should further elucidate sulfonamide reactivity as influenced by mineral surface chemistry and topography. Moreover, the observed transformation suggests manganese oxides likely play an important role in the fate of SMX in the environment.

  12. VARIACIÓN DE PARÁMETROS FISICOQUIMICOS DURANTE UN PROCESO DE COMPOSTAJE

    Directory of Open Access Journals (Sweden)

    Diana María Farias Camero

    2010-08-01

    Full Text Available Se llevaron a cabo dos procesos de compostaje a partir de residuos lignocelulósicos de rosas durante 165 días aproximadamente. En uno de los procesos la descomposición del material fue realizada sólo por microorganismos (compostaje directo y en el otro fuera de los microorganismos se adicionaron lombrices de tierra Eisenia foetida (compostaje indirecto. El compostaje directo fue realizado en un sistema de compostación denominado "camas" y el proceso indirecto se desarrolló en la etapa inicial en un sistema de "panelas" siendo trasladado posteriormente a una cama. Los dos procesos se manejaron con adiciones de cal, NH4NO3 (20%N y microorganismos. Se tomaron muestras periódicas en diferentes lugares de las pilas y se midió semanalmente la temperatura. En cada una de las muestras se determinaron los siguientes parámetros fisicoquímicos: % humedad, color, pH en relaciones muestra: agua 1:5 y 1:10, cenizas, materia orgánica. Cíe libre de cenizas, carbono, nitrógeno y relación C/N. En el extracto acuoso se determinaron el contenido de carbono orgánico total y nitrógeno, la relación C/N y el porcentaje de hidrosolubles y se hizo un ensayo de germinación en el que se calculó el porcentaje de semillas de berro (Lepidium sativum que germinaron en el extracto. La variación de los parámetros en cada uno de los procesos permifió establecer que los mayores cambios en el material se llevan a cabo durante las etapas iniciales del proceso (fases termófila y mesófila, siendo la presencia de microorganismos el factor limitante de la dinámica del proceso; así mismo la adición de lombrices de tierra no aceleró la mineralización de la materia orgánica. A nivel metodológico se estableció que la determinación del color no es un parámetro efectivo para evaluar el estado de madurez del compost y que, medidas de la temperatura y el porcentaje de germinación pueden realizarse rutinariamente para determinar el avance del proceso. Para

  13. Las ciudades disidentes durante la independencia de Venezuela: el caso de Maracaibo

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    Zulimar Maldonado Viloria

    2005-01-01

    Full Text Available En este estudio de caso se analizan las particularidades del proceso histórico que vivió Maracaibo durante los primeros años de la Independencia Venezolana. Es de interés para la historiografía venezolana y latinoamericana profundizar en el análisis de la realidad que explica la reacción de una “ciudad disidente” como Maracaibo, cuya elite prefirió seguir los lineamientos de la Regencia, elegir su diputado para las Cortes de Cádiz y defender su autonomía, antes que aceptar la propuesta de emancipación caraqueña. Bajo esta perspectiva se pretende esclarecer si la elite maracaibera fue realmente “disidente” del movimiento caraqueño por inercia histórica, larga herencia hispánica, o su actuación estuvo apegada a la legitimidad del momento como una opción política para lograr reafirmar y acrecentar su autonomía dentro del régimen monárquico. La investigación se ubica en la actual corriente historiográfica europea e hispanoamericana que sale al paso a los tradicionales análisis sustentados en una visión fáctica y localista, ignorando la amplitud temporal y espacial del proceso; se centra en el conocimiento que aporta el estudio comparado de la actitud de Maracaibo ante la Independencia con su desarrollo en el resto del país y acontecimientos en el mundo hispánico.

  14. Los franciscanos seglares en la Corona de Castilla durante el Antiguo Régimen

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    Martín García, Alfredo

    2005-12-01

    Full Text Available Third Lay Order of St Francis represents one important example of the Catholic Reform effects in the lay world. After a phase of decline for 16 century, this movement experienced a glorious period in the Castile of 17* century. Kings, nobles or, even, peasants dressed its habit, one of them for live a more intense religiosity, another for benefit of its numerous privileges. Across the normative texts of the Order and the documentation of several congregations of the Crown of Castile, we have tried to answer some of the doubts that this movement generates: its juridical status in the Catholic Church or its social, welfare and religious dimensions.

    La tercera orden secular de San Francisco constituye uno de los ejemplos más notables de la influencia de la reforma tridentina en el mundo seglar. Tras una etapa de decadencia absoluta durante el siglo XVI, el movimiento vivió una etapa de esplendor en la Castilla del XVIL Reyes, nobles o simples campesinos tomaron el hábito tercero, bien para desarrollar una vida religiosa más intensa o bien para beneficiarse de sus múltiples privilegios espirituales y temporales. A través de los textos normativos de la orden y de la documentación vaciada en los archivos de varias fraternidades de la Corona de Castilla, hemos intentado responder a algunas de las dudas que suscita un movimiento religioso tan poco conocido hasta la actualidad: su estatus jurídico en el seno de la Iglesia o sus dimensiones sociales, asistenciales y devocionales.

  15. Los conflictos político-religiosos en Colombia durante el siglo XIX

    Directory of Open Access Journals (Sweden)

    Fernando Santamaría Lambás

    2013-12-01

    Full Text Available Este artículo está publicado en España como “Los conflictos político-religiosos en Colombia durante el siglo XIX”, publicado en J.J. Caerols (ed., Religio in labyrintho, Madrid, Escolar y Mayo Editores, 2013, pp. 211-225, ISBN 978-84-941056-8-5 incluyendo en él referencia y cita bibliográfica de la publicación originalSUMARIO: 1. Introducción – 2. Las guerras civiles – 2.1. Las guerras por la definición del sujeto político – 2.1.a La guerra de los Supremos (1839-1842 – 2.1.b Las guerras de 1851 y 1854 – 2.2. Las guerras por la definición del sujeto político y el carácter de la educación – 2..2.a La guerra de 1861 – 2.2.b La guerra de 1876 – 2.2.c La guerra de 1885 – 2.3. Las guerras contra la exclusión en las que entran en juego los límites de la centralización – 2.3.a La guerra de 1895 – 2.3.b La guerra de los Mil Días. Abstract: During the nineteenth century in Colombia conflict is settled through political parties, the liberal and conservative, and civil wars, in which the religious element is sometimes the trigger of the conflict and sometimes the convener. We will use the literature to approach these wars and to better understand what happened in reality.Keywords Colombia, civil wars, political parties, religion.

  16. Exigência de metionina + cistina para codornas de corte durante a fase de crescimento

    Directory of Open Access Journals (Sweden)

    F. Ferreira

    2012-02-01

    Full Text Available Estudou-se o efeito de diferentes níveis de metionina+cistina sobre o desempenho de codornas de corte durante a fase inicial (nascimento ao 21º dia e fase total de criação (nascimento ao 35º dia de idade. Foram utilizadas 288 codornas, de ambos os sexos, distribuídas em delineamento inteiramente casualizado. Os tratamentos consistiram de seis níveis de metionina+cistina total (0,73; 0,79; 0,85; 0,91; 0,97 e 1,03%, quatro repetições e doze aves por unidade experimental. Os parâmetros avaliados foram peso corporal, ganho de peso, consumo e conversão alimentar para fase inicial e total de criação. Observou-se efeito quadrático significativo do nascimento ao 21º dia de idade para todos os parâmetros avaliados, sendo observado melhor desempenho nas codornas alimentadas com 0,95% de metionina+cistina para peso corporal e ganho de peso, e 0,94% para consumo e conversão alimentar. Houve efeito quadrático do nível de metionina+cistina do nascimento ao 35º dia de idade para peso corporal, ganho de peso e consumo alimentar, com melhores desempenhos nos níveis de 0,93; 0,93 e 0,94%, respectivamente. A exigência de metionina+cistina para máximo ganho de peso na fase inicial é de 0,95%, e para fase total de criação é de 0,93%.

  17. Prevalência de enteroparasitoses em fezes colhidas durante necrópsias

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    João Antônio de Almeida

    1991-03-01

    Full Text Available Com o objetivo de verificarmos a prevalência de enteroparasitoses, colhemos o conteúdo do tubo digestivo, em três porções distintas, durante a realização de 135 necrópsias completas. As fezes foram conservadas em MIF (mistura de formol, iodo e merthiolate, e analisadas pelo exame protoparasitológico direto. Encontramos enteroparasitas em 40 casos (29,6%, sendo que em 11 deles (27,5% havia poliparasitismo e em 29 casos (72,5% monoparasitismo. As enteroparasitoses mais freqüentes foram o S. stercoralis (31,9%, E. histolytica (23,4%, Ancilostomídeos (19,1% e A. lumbricoides (17%. Os resultados estão de acordo com levantamentos epidemiològicos na região. Além disso, mostram que o exame protoparasitológico de fezes colhidas concomitantemente ao exame necroscópico fornece mais um subsídio ao diagnóstico anatomopatológico.With the Intention to verify the frequency of intestinal parasites, we have taken the inside digestive system material from three differents parts of the intestinal tract while we were doing 135 complete necropsies. The stools were kept in MIF (Formol, iodine and merthiolate mixture being studied in slides by the direct method. We have found intestinal parasites in 40 cases (29.6%, 11 (27.5% with two or more kinds of parasites and 29 cases (72.5% with only one kind ofparasite. The most frequent parasites were: S. stercoralis (31,9%, E. hystolytica (23.4%, hook worm (19.1% and A. lumbricoides (17%. The results are in according with epidemiological research made in this area. Thus, they prove that the parasitological exam made in feces taken during the necroscopy provides further evidence to enrich the anatomo-pathological diagnosis.

  18. Nutrición y desarrollo psicomotor durante el primer semestre de vida

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    CHÁVEZ ADOLFO

    1998-01-01

    Full Text Available Objetivo. Estudiar el desarrollo psicomotor de niños pequeños de una comunidad rural pobre y mal alimentada y relacionarlo con la alimentación y nutrición tanto de su madre como de ellos mismos. Material y métodos. Se estudiaron 82 unidades madre-niño, desde antes del quinto mes de embarazo hasta los seis meses de edad del niño, en antropometría y dieta; en el niño se aplicaron pruebas de Brazelton al nacer, de Bayley a los tres y seis meses de edad y de interacción con su madre. Resultados. Varias de las pruebas psicomotoras del niño se correlacionaron positivamente con el peso de la madre y sus pliegues cutáneos, lo mismo que con su propio peso y talla previos. También con el consumo materno de productos animales y frutas durante el embarazo y negativamente con el consumo de tortillas y frijoles. Las correlaciones de varias de las pruebas del niño a los seis meses fueron positivas con su consumo complementario, de energía total y de varios alimentos, sobre todo de huevo, leche y frutas alrededor de los tres meses de edad. Conclusiones. Es importante que dentro del estrato social rural pobre estudiado, pequeñas variaciones de consumo de alimentos y nutrición de la unidad materno-infantil den lugar a cambios en las diversas pruebas de desarrollo psicomotor del niño pequeño, lo que sugiere la necesidad de impulsar más los programas de nutrición aplicados.

  19. Fiesta y Patria durante la Regeneración en Colombia. Santander (1886-1899

    Directory of Open Access Journals (Sweden)

    Oscar Blanco Mejía

    2012-07-01

    Full Text Available

    Resumen

    La fiesta patria durante la Regeneración en Colombia, adquiere importancia  no sólo porque es la representación de una nación católica en el país, acorde con el proyecto político implementado por los conservadores, sino además, y lo más importante,  porque cumple un papel de alquimia social, que transforma lo arbitrario en legitimo al  instaurar una rutina. Para comprender esta función, la presente ponencia pasara revista de manera breve a los orígenes de las fiestas nacionales en la región, y posteriormente, se adentrará en el  tema de la Regeneración.

     

    Palabras claves: Fiesta  republicana, regeneración, alquimia social.

     

    Abstract

    The national holiday during Regeneration in Colombia, becomes important not only because was the representation of a Catholic nation in the country, according to the political project implemented by the Conservatives, but also and most importantly, it plays the role of social alchemy, which transforms the arbitrary toward legitimate to establish a routine. To understand this function, this essay  briefly  review of the origins of national holidays in the region, and subsequently, will development  the theme of Regeneration.

     

    Keywords: Republican holiday, regeneration, social alchemy.

  20. Implicaciones del comercio por el puerto de San Blas durante la guerra de independencia

    Directory of Open Access Journals (Sweden)

    Trejo Barajas, Dení

    2006-12-01

    Full Text Available This article analyzes the importance acquired during the Independence war by the maritime trade coming from other Central and South American ports and operating through the San Blas port. The antecedents of the colonial commerce are studied, as well as the British presence and the consequences of the free trade measures taken by the Spanish government which particularly affected the Nueva Galicia Intendencia and the Pacific coasts of Nueva España. In the end, this highly polemical traffic permitted by the Spanish authorities strengthened Nueva Galicia both politically and economically, and prefigured the regionalism that was to be characteristical in 19th Century Mexico.

    En este artículo se analiza la importancia que adquirió, durante la guerra de Independencia, el comercio marítimo por el puerto de San Blas procedente de Panamá y otros puertos centro y sudamericanos. Se exponen los antecedentes relativos a la crisis del comercio colonial, la presencia inglesa y los efectos de las medidas de libre comercio adoptadas por el gobierno español que afectaron de manera particular a la intendencia de Nueva Galicia y las costas del Pacífico novohispano. Se revisan las consecuencias de este polémico tráfico permitido por las autoridades hispanas y que desembocó en el fortalecimiento político y económico de la Nueva Galicia, prefigurando el regionalismo característico del siglo XIX mexicano.

  1. CRUZANDO LOS MALLKUS. LAS MIGRACIONES BOLIVIANAS PENDULARES DURANTE LAS GRANDES CRISIS SALITRERAS (1914 - 1933

    Directory of Open Access Journals (Sweden)

    Sergio González Miranda

    2011-10-01

    Full Text Available Este artículo analiza el proceso migratorio pendular de la población boliviana (especialmente indígena hacia las salitreras de Tarapacá; destacándose la “gran crisis” de 1930 y años siguientes, analizando el desarraigo del retorno a Bolivia. Se sostiene que a partir del término de la Primera Guerra Mundial se inicia la decadencia del ciclo de expansión del salitre, generando procesos migratorios de atracción y expulsión de mano de obra, donde el drama social producto de la cesantía fue el factor común. En otras palabras, se plantea que la crisis del salitre no surgió en la década de los años treinta, como suele reconocerse en la literatura especializada sobre la industria salitrera, sino a partir de la primera guerra mundial se inicia el proceso de decadencia del mercado mundial del nitrato, siendo la década de los años veinte cuando se define el futuro de esta industria. Se estudia, especialmente a través de la prensa y archivos oficiales, los sistemas de enganche, los flujos de ida y venida de trabajadores bolivianos con sus familias, especialmente durante los años de crisis entre 1914 y 1933, donde el drama de la cesantía afectó a miles de bolivianos que debieron regresar a sus comunidades de origen. Este artículo se enmarca dentro de un análisis histórico que rescata la importancia de la sociedad civil en las relaciones entre países fronterizos, como Bolivia y Chile, fenómeno que la disciplina de las relaciones internacionales denomina acertadamente “paradiplomacia”.

  2. Litiasis renal: Modificaciones bioquímicas durante el seguimiento Renal lithiasis: Biochemical changes in the follow-up

    OpenAIRE

    Francisco R. Spivacow; Elisa E. Del Valle; Jose R. Zancheta

    2006-01-01

    Con el objeto de evaluar si se producen modificaciones bioquímicas durante el seguimiento de pacientes nefrolitiásicos, se estudiaron 237 pacientes (115 mujeres y 122 hombres con una edad promedio de 39 ± 8 y 42 ± 7 años respectivamente) controlados durante 23.7 ± 19.3 meses. A todos se les realizó un estudio metabólico de litiasis renal inicial y como mínimo uno o más posteriormente con las mismas características que el basal. No fueron incluidos pacientes con los diagnósticos de riñón en es...

  3. Bienestar animal durante el transporte y su relación con la calidad de la carne bovina

    Directory of Open Access Journals (Sweden)

    Marlyn Romero P.

    2012-04-01

    Full Text Available El bienestar animal (BA es un elemento diferenciador en la comercialización de la carne bovina a nivel internacional, aunque no forma parte de los acuerdos comerciales, se pueden citar ejemplos de las experiencias de Chile, Argentina, Brasil y Uruguay con la Unión Europea, que los ha privilegiado para la exportación de carne fresca bovina con este valor agregado. Durante el transporte, cargue y descargue los bovinos son sometidos a factores estresantes que afectan su bienestar y la calidad de la carne, además de producir importantes pérdidas económicas a los productores. Este trabajo presenta una revisión sobre el bienestar animal durante el transporte, y su relación con la calidad de la carne bovina.

  4. Los colombianos y las redes del narcotráfico en Nueva York durante los años 70

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    Eduardo Sáenz Rovner

    2014-05-01

    Full Text Available La idea que se tiene sobre el narcotráfico desde Colombia es que éste ha sido manejado por “carteles”. Lo que la evidencia empírica muestra es que además de las grandes organizaciones criminales, el narcotráfico durante las últimas décadas, y en particular durante los años 70, objeto de este escrito, ha sido un negocio abierto con innumerables participantes (incluyendo mulas “free lancers” que se constituían en microempresarios del narcotráfico, en buena parte colombianos pero también de otras nacionalidades. De ahí que la idea de carteles que ejercen poderes monopólicos, es equivocada. La información inédita con la que se escribió este ensayo es tomada principalmente de una serie de archivos norteamericanos.

  5. Química en Puebla durante el siglo XX: continuación de una tradición

    OpenAIRE

    María Eugenia Mendoza; Leticia Quintero; Fernando Santiesteban; Isaac Wolfson

    2001-01-01

    Se presentan datos históricos del desarrollo de la Química en los siglos XVIII y XIX, donde los estudios de farmacia predominan. Es durante el siglo XX que se dan cambios que permiten ampliar la formación de los químicos; así en 1921 se registra la carrera de Químico Farmacéutico. Durante 1946 se crea la carrera de Químico Técnico que en 1952 se establece como la licenciatura en Química. A partir de los años setenta, comienza el desarrollo de la investigación al integrarse los primeros grupos...

  6. L’Éducation Physique et Sportive entre sport et mixité durant les années 68

    OpenAIRE

    Szerdahelyi, Loïc

    2009-01-01

    À partir de textes officiels, de publications professionnelles et de représentations d’enseignantes d’EPS ayant vécu la mise en place de la mixité, cet article analyse la construction du genre en éducation physique durant les années 68. Si la mixité est d’abord évacuée au profit de l’officialisation sportive de l’éducation physique, les dissidences acquièrent une légitimité certaine durant la crise de mai-juin 68. Pourtant, l’organisation de l’EPS conserve une frontière et maintient les disti...

  7. Effects of Chinese mineral strategies on the U.S. minerals industry

    Science.gov (United States)

    McCartan, L.; Menzie, W.D.; Morse, D.E.; Papp, J.F.; Plunkert, P.A.; Tse, P.-K.

    2006-01-01

    For more than two decades now, China has been undergoing rapid economic growth and industrialization. The industrialization and urbanization of the once rural, farming nation is leading to increased consumption of mineral commodities to build infrastructure and to make into consumer goods. This increased consumption has led to higher mineral prices, lower stocks and, in some cases, temporary shortages of minerals. Chinese mineral producers and manufacturers are responding by building capacity, restructuring and modernizing industrial sectors and establishing international network that compete with those of the United States and other nations.

  8. Desplazamientos accidentales de dientes durante las maniobras de exodoncia. A propósito de 8 casos

    OpenAIRE

    Abad Sánchez, Daniel; Berini Aytés, Leonardo; Sánchez Garcés, Ma. Ángeles; Gay Escoda, Cosme

    1998-01-01

    Los desplazamientos accidentales de dientes hacia espacios anatómicamente comprometidos se presentan con poca frecuencia y se describen en raras ocasiones. Se presentan 8 casos de dientes y restos radiculares que han sido desplazados durante las maniobras de exodoncia. Seis casos corresponden a desplazamientos al seno maxilar, un caso a un tercer molar inferior desplazado al tejido subcutáneo cervical en contacto con la fascia del músculo esternocleidomastoideo y un caso de un resto radicular...

  9. Reflexión de futuros profesores de matemáticas durante las practicas de enseñanza

    OpenAIRE

    Castellanos, María; Flores, Pablo; Moreno, Antonio

    2014-01-01

    Este proyecto de investigación que tiene como objetivo estudiar el proceso de iniciación al desarrollo profesional de estudiantes para profesor de matemáticas durante la realización de las prácticas de enseñanza. Para esto, se describen los elementos que componen dicho proyecto y se manifiestan los antecedentes, referentes que orientan los propósitos de la investigación

  10. Grado de conciencia que presentan los profesores del aspecto comunicativo no-verbal durante el acto didáctico

    Directory of Open Access Journals (Sweden)

    Isabel CUADRADO GORDILLO

    2009-11-01

    Full Text Available El trabajo que se presenta forma parte de una investigación más amplia titulada «Comunicación no-verbal e implicaciones didácticas en el aula: Desarrollo y análisis de casos de conciencia propia», cuyo objetivo principal consiste en describir, analizar e interpretar el grado de conciencia que los profesores presentan de sus comportamientos no-verbales durante el proceso interactivo didáctico.

  11. Retención de aroma durante el secado de extracto de café en un sistema cerrado

    Directory of Open Access Journals (Sweden)

    J.F. Vílchez

    2006-01-01

    Full Text Available Durante el secado de alimentos líquidos, componentes volátiles presentes en baja concentración que contribuyen al aroma y sabor del producto final son removidos junto con el agua. En consecuencia la calidad del producto final es considerablemente afectada por la cantidad de substancias volátiles que son retenidas durante el proceso de secado. En el extracto de café, por ejemplo, existen cientos de tales compuestos, la mayoría de ellos altamente volátiles por lo que se pierden cuando el extracto es transformado en polvo seco. Independientemente del método utilizado, parece ser imposible evitar completamente la perdida de compuestos volátiles durante el secado. Un método potencial para mejorar la retención del aroma durante el secado es utilizar un sistema que trabaje a ciclo cerrado. Con el propósito de estudiar este proceso una planta piloto que consiste de un secador por aspersión, un secador de lecho fluidizado vibratorio, un sistema de recuperación de vapores e intercambiadores de calor para recalentar el aire reciclado ha sido diseñada y esta en la fase final de instalación en la Facultad de Ingeniería Química de la Universidad Nacional de Ingeniería, en Managua, para hacer un estudio del método potencial de recuperación de aroma del extracto de café. Este estudio tendrá como resultado no solo un café soluble de mejor calidad sino que además un método capaz de mejorar el procesamiento de muchos otros alimentos líquidos.

  12. Rede social durante a expansão da família Rede social durante la expansión de la familia Social net during family expansion

    Directory of Open Access Journals (Sweden)

    Nádia Cristina Jussani

    2007-04-01

    Full Text Available Estudo de natureza qualitativa que estudou a rede de suporte de famílias durante a gravidez. Os dados foram coletados em maio de 2003, através de entrevista semi-estruturada, junto à 16 mulheres. Os resultados revelaram que apenas uma mulher não recorreu à rede de apoio e que diferentes pessoas são procuradas conforme o tipo de problema vivenciado: dificuldades econômicas ou de aceitação da gravidez, necessidade de apoio emocional ou de esclarecimentos, ajuda para os afazeres domésticos, entre outros. Conclui-se que a rede social favorece o bom desenvolvimento da gestação e que para uma assistência mais eficaz é indicado que os profissionais de saúde atentem para o fato de a mulher ter uma rede de suporte com que possa contar durante a gravidez.Estudio descriptivo, de naturaleza cualitativa desarrollado con el objetivo de estudiar la red de soporte de familias durante el embarazo. Los datos han sido colectados en mayo de 2003, a través de entrevista semiestructurada, junto a 16 mujeres. Los resultados han revelado que apenas una mujer no ha recorrido a la red de apoyo durante el embarazo y que diferentes personas son procuradas de acuerdo con el tipo de problemas vivenciado: dificultades económicas o de aceptación del embarazo, necesidad de apoyo emocional o de esclarecimiento, ayuda para los quehaceres domésticos, entre otros. Se concluí que la red social ayuda el buen desarrollo de la gestación y que los profesionales de salud necesitan saber si hay una red de soporte que pueda contar durante el embarazo.This is a research of qualitative nature developed with the objective of studying the support net of families during pregnancy. Data were collected through semi-structured interview, from 16 women in May 2003. The results showed that just one woman did not appeal to the support net during pregnancy and that different people are sought according to the type of problem experienced at the time: economical difficulties or of

  13. ANALSIS DEL PATRÓN Y LAS PRESIONES PLANTARES DURANTE LA RECEPCIÓN EN UNA COLCHONETA

    Directory of Open Access Journals (Sweden)

    F. Huertas

    2010-10-01

    Full Text Available
    Dentro de las rutinas de la gimnasia deportiva, un elemento común son las
    recepciones sobre la colchoneta. En este sentido, diversos han sido los estudios cinéticos y cinemáticos realizados sobre la recepción y cuyos resultados pueden han sido útiles para la mejora en la compresión de la recepción y diseño de colchonetas. No obstante, el estudio de las presiones plantares durante la recepción no ha sido desarrollado por ninguna
    investigación a pesar de que el pie transmite al cuerpo las cargas de reacción generadas en el contacto con la colchoneta y dependiendo de su magnitud, frecuencia y punto de aplicación se pueden producir diferentes lesiones. El conocimiento de dichas cargas es importante no solo para la prevención de lesiones o criterios en el diseño de colchonetas, sino también para la mejora del rendimiento deportivo, mejorando la estabilidad durante la recepción. El presente trabajo muestra cuales son las zonas del pie a analizar, el patrón y las magnitudes de las presiones plantares durante una recepción tras un salto.

  14. Perda de peso e consumo de bebidas durante sessões de treinamento de ballet clássico

    Directory of Open Access Journals (Sweden)

    Cláudia Villela da Silva

    2011-06-01

    Full Text Available O objetivo do estudo foi analisar a perda de peso (PP e o consumo de líquidos durante sessões de treinamento de ballet clássico. A amostra foi composta por vinte e uma bailarinas, que foram avaliadas em três sessões de ballet: uma sessão sem oferta de líquidos, uma sessão com oferta de água e outra com oferta de bebida esportiva. Na sessão em que as bailarinas receberam água, a mediana de consumo foi 376,19 mL e a mediana de PP foi -190g. Na sessão com bebida esportiva, a mediana do consumo foi de 226,19 mL e a mediana da PP foi -150g. Observou-se diferença na ingestão de líquidos, mas não na PP, durante as sessões com consumo de líquidos (p=0,01 e p=0,79, respectivamente. As bailarinas, voluntariamente, beberam mais água do que bebida esportiva durante os treinos de ballet clássico.

  15. FONTES DE ESPÉCIES REATIVAS DE OXIGÊNIO NA MUSCULATURA ESQUELÉTICA DURANTE O EXERCÍCIO

    Directory of Open Access Journals (Sweden)

    Paulo Guimarães Gandra

    2006-10-01

    Full Text Available O músculo esquelético gera constantemente espécies reativas de oxigênio, através da reduçãomonoeletrônica do oxigênio molecular. Durante o exercício físico o consumo de oxigênio pelamusculatura esquelética exercitada pode ser aumentado em aproximadamente 100 vezes.Acredita-se que a geração de espécies reativas de oxigênio deve ser proporcional a esteaumento. O objetivo deste trabalho é apresentar todos os possíveis locais e mecanismos deprodução de espécies reativas de oxigênio na musculatura esquelética durante o exercíciofísico. A tradicional visão de que o aumento do consumo de oxigênio e o aumento do fluxo deelétrons pela cadeia de transporte de elétrons mitocondrial regulam a produção de espéciesreativas de oxigênio durante e após o exercício pode não ser exclusiva, nem a mais importanteao considerarmos os vários tipos de exercício.

  16. El ejercicio físico durante el embarazo: ¿un riesgo para el recién nacido?

    Directory of Open Access Journals (Sweden)

    Rubén Barakat Carballo

    2009-03-01

    Full Text Available Presentamos aquí un trabajo de investigación que relaciona el ejercicio físico realizado durante el segundo y tercer trimestre de embarazo con la salud general de recién nacido. Se llevó a cabo un trabajo experimental, del tipo de Casos y Controles, que incluyó un total de 142 mujeres gestantes, luego de entrevistar a 480 mujeres embarazadas en su primera consulta prenatal. El trabajo consistió en 3 clases semanales de 35 minutos cada una de ejercicio aeróbico de carácter moderado desarrollado durante el segundo y tercer trimestre de embarazo. Todas las gestantes fueron consultadas por factores que pudiesen actuar como “de confusión” (edad, paridad, actividad laboral, tabaquismo. Se valoraron una serie de parámetros materno-fetales, especialmente el peso y talla de nacimiento, Test de APGAR y tipo de parto, así como edad gestacional materna en el momento del parto. Los resultados obtenidos permiten concluir que la práctica de ejercicio moderado durante el segundo y tercer trimestre de embarazo no ocasionan riesgos en el estado de salud general del recién nacido.

  17. Paleogeografía de América del Sur durante el Jurásico Paleogeography of South America during the Jurassic

    Directory of Open Access Journals (Sweden)

    María Paula Iglesia Llanos

    2008-12-01

    Full Text Available El presente estudio fue efectuado en cuatro secciones del Jurásico Temprano marino de las provincias de Mendoza y Neuquén, compuestas mayormente por rocas sedimentarias de grano fino portadoras de amonites y volcanitas intercaladas. Se aislaron dos componentes magnéticas portadas por titanomagnetitas y en forma subordinada, por otro mineral de alta coercitividad/temperatura de bloqueo (titanohematita?. La componente A, que es la más blanda, se interpreta como una remagnetización relativamente reciente, en tanto la componente B correspondería a la magnetización original adquirida durante o poco después de la depositación de los sedimentos y el enfriamiento de las volcanitas en el Jurásico Temprano, de acuerdo a las diversas pruebas de campo de estabilidad paleomagnética y estudios ópticos. Sobre la base de estos datos, se obtuvieron dos nuevos polos paleomagnéticos, uno para el Hetangiano-Sinemuriano (223°E, 51°S, A95= 6°, N = 25 y otro para el Pliensbaquiano-Toarciano (67°E, 74°S, A95= 5°, N = 52. Los mismos fueron utilizados con otros paleopolos del continente cuidadosamente seleccionados para construir una curva de deriva polar aparente para el intervalo Triásico Tardío-Jurásico Tardío, la cual resulta completamente diferente a las que se proponen en la literatura. En particular, se destaca la presencia de un codo en el tramo Jurásico Temprano que refleja importantes desplazamientos latitudinales de América del Sur y que se halla asimismo en otros continentes de Pangea. Así, los datos obtenidos indican que América del Sur se localizaba durante el lapso Triásico Tardío- Sinemuriano en latitudes más australes que la actual en tanto en el Pliensbaquiano se encontraba por el contrario, en su posición más septentrional. A finales del Jurásico Temprano el continente se desplazó nuevamente al sur hasta ubicarse durante el Jurásico Medio en latitudes semejantes a las actuales. Estos cambios latitudinales est

  18. Implementation plan for Bolivian Mineral Exploration Fund

    Science.gov (United States)

    Kirkemo, Harold

    1978-01-01

    Bolivia ranks second among world producers of tin and antimony, and first in bismuth production. Mineral exports in 1975 were valued at $314.2 million, nearly 60 percent of the value of all exports, and petroleum product exports totalled nearly $157 million, or 30 percent of the total. Tin accounted for 58 percent of the total value of metallic mineral exports. The central government derived about 19 percent of its total tax revenues in 1975 from the mining sector. The mining sector consists of the large, medium, and small mining subsectors, a classification established by the government. Individual operations are referred to as large, medium, or small depending upon the subsector into which they are classified. All large mining enterprises are owned and operated by a government corporation, COMIBOL; the medium and small operations are privately owned. COMIBOL's exports in 1975 were valued at $171.8 million or 70 percent of the total mineral exports; the medium mines accounted for $55.5 million or 23 percent, and the small mines for $17.5 million or 7 percent of the total. The combination of high operating costs, low productivity, inadequate ore reserves, and insufficient risk capital for exploration and development has led to the realization that there is an urgent need to improve the situation for mining in Bolivia. Proposals are being studied to revise the tax code, a program is underway to evaluate selected mineral deposits for possible exploration and development, and programs are under consideration to encourage minerals exploration. A minerals exploration plan is proposed which would offer technical and financial aid to various segments in the minerals field. A program, estimated to cost between $2 million and $2.5 million annually, and to be operated by a new agency in the Ministry of Mining and Metallurgy, is outlined.

  19. [Occurrence relationship between iron minerals and clay minerals in net-like red soils: evidence from X-ray diffraction].

    Science.gov (United States)

    Yin, Ke; Hong, Han-Lie; Han, Weni; Ma, Yu-Bo; Li, Rong-Biao

    2013-04-01

    The high purity of clay minerals is a key factor to reconstruct the palaeoclimate in clay mineralogy, however, the existence of iron minerals (such as goethite and hematite) and organics lead to the intergrowth of clay minerals and other minerals, producing other mineral impurities in enriched clay minerals. Although the removal of organics in soil sediments has been fully investigated, the occurrence state of iron minerals remains controversial, hindering the preparation of high-purity clay minerals. Therefore, the occurrence relationship of iron minerals and clay minerals in Jiujiang net-like red soils of the middle to lower reaches of the Yangtze River was investigated using the sequential separation method, which provided some implications for the removal of iron minerals in soil sediments. The results indicated that goethite and hematite were mostly absorbed on the surface of hydroxy-interlayered smectite and illite in the form of films, and the rest were absorbed by kaolinite.

  20. Bioleaching of serpentine group mineral by fungus Talaromyces flavus: application for mineral carbonation

    Science.gov (United States)

    Li, Z.; Lianwen, L.; Zhao, L.; Teng, H.

    2011-12-01

    Many studies of serpentine group mineral dissolution for mineral carbonation have been published in recent years. However, most of them focus mainly on either physical and chemical processes or on bacterial function, rather than fungal involvement in the bioleaching of serpentine group mineral. Due to the excessive costs of the magnesium dissolution process, finding a lower energy consumption method will be meaningful. A fungal strain Talaromyces flavus was isolated from serpentinic rock of Donghai (China). No study of its bioleaching ability is currently available. It is thus of great significance to explore the impact of T. flavus on the dissolution of serpentine group mineral. Serpentine rock-inhabiting fungi belonging to Acremonium, Alternaria, Aspergillus, Botryotinia, Cladosporium, Clavicipitaceae, Cosmospora, Fusarium, Monascus, Paecilomyces, Penicillium, Talaromyces, Trichoderma were isolated. These strains were chosen on the basis of resistance to magnesium and nickel characterized in terms of minimum inhibiting concentration (MIC). Specifically, the strain Talaromyces flavus has a high tolerance to both magnesium (1 mol/L) and nickel (10 mM/L), and we examine its bioleaching ability on serpentine group mineral. Contact and separation experiments (cut-off 8 000-14 000 Da), as well as three control experiments, were set up for 30 days. At least three repeated tests were performed for each individual experiment. The results of our experiments demonstrate that the bioleaching ability of T. flavus towards serpentine group mineral is evident. 39.39 wt% of magnesium was extracted from lizardite during the bioleaching period in the contact experiment, which showed a dissolution rate at about a constant 0.126 mM/d before reaching equilibrium in 13 days. The amount of solubilized Mg from chrysotile and antigorite were respectively 37.79 wt% and 29.78 wt% in the contact experiment. These results make clear the influence of mineral structure on mineral bioleaching

  1. Biomimetic Mineralization of Recombinamer-Based Hydrogels toward Controlled Morphologies and High Mineral Density.

    Science.gov (United States)

    Li, Yuping; Chen, Xi; Fok, Alex; Rodriguez-Cabello, Jose Carlos; Aparicio, Conrado

    2015-11-25

    The use of insoluble organic matrices as a structural template for the bottom-up fabrication of organic-inorganic nanocomposites is a powerful way to build a variety of advanced materials with defined and controlled morphologies and superior mechanical properties. Calcium phosphate mineralization in polymeric hydrogels is receiving significant attention in terms of obtaining biomimetic hierarchical structures with unique mechanical properties and understanding the mechanisms of the biomineralization process. However, integration of organic matrices with hydroxyapatite nanocrystals, different in morphology and composition, has not been well-achieved yet at nanoscale. In this study, we synthesized thermoresponsive hydrogels, composed of elastin-like recombinamers (ELRs), to template mineralization of hydroxyapatite nanocrystals using a biomimetic polymer-induced liquid-precursor (PILP) mineralization process. Different from conventional mineralization where minerals were deposited on the surface of organic matrices, they were infiltrated into the frameworks of ELR matrices, preserving their microporous structure. After 14 days of mineralization, an average of 78 μm mineralization depth was achieved. Mineral density up to 1.9 g/cm(3) was found after 28 days of mineralization, which is comparable to natural bone and dentin. In the dry state, the elastic modulus and hardness of the mineralized hydrogels were 20.3 ± 1.7 and 0.93 ± 0.07 GPa, respectively. After hydration, they were reduced to 4.50 ± 0.55 and 0.10 ± 0.03 GPa, respectively. These values were lower but still on the same order of magnitude as those of natural hard tissues. The results indicated that inorganic-organic hybrid biomaterials with controlled morphologies can be achieved using organic templates of ELRs. Notably, the chemical and physical properties of ELRs can be tuned, which might help elucidate the mechanisms by which living organisms regulate the mineralization process.

  2. Evolution of Mineral-Organic Matter Associations in Sediments: From (Bio)mineralization to Burial

    Science.gov (United States)

    Estes, E.; Nordlund, D.; Wankel, S. D.; Hansel, C. M.

    2014-12-01

    Physical and chemical associations with mineral surfaces may protect organic matter (OM) from oxidative degradation and allow its preservation in soils and sediments. This study evaluates the mechanism of mineral-based preservation (MBP) and the time scale on which MBP is operative by tracking the co-evolution of oxide minerals and associated OM during mineral precipitation and ripening. Scanning transmission X-ray microscopy coupled to near edge X-ray absorption fine structure spectroscopy (STXM-NEXAFS) as well as bulk NEXAFS demonstrate that, in laboratory systems using cell-free filtrate from pure bacterial cultures, an association between OM and biogenic manganese oxides is rapidly established. OM associated with freshly precipitated biominerals consists of proteinaceous carbon and nitrogen consistent with a microbial origin; this composition remains constant over the course of 96 hours, despite mineral aggregation and structural evolution from hexagonal to triclinic birnessite. We predict that, in natural systems, oxide minerals simultaneously drive remineralization and offer MBP. Different minerals will promote a different balance between the two, imparting a mineral-specific signature on the concentration and composition of preserved OM. We test this idea by conducting incubations of natural estuary waters spiked with compositionally and structurally diverse synthetic oxide minerals. The concentration and composition of mineral-associated OM were tracked by element analyzer-isotope ratio mass spectrometry (EA-IRMS) and STXM-NEXAFS in multiple experiments lasting between 4 weeks and 1 year. Results from incubation experiments are contrasted with natural sediment samples from a range of depositional environments in order to evaluate the potential for long-term sequestration of organic carbon in sediments facilitated by minerals.

  3. Estudio descriptivo de la analgesia obtenida durante el trabajo de parto con PCA de remifentanilo: modelo británico

    Directory of Open Access Journals (Sweden)

    C. Morales Muñoz

    2014-12-01

    Full Text Available Introducción: la analgesia epidural obstétrica continúa siendo el "gold-standard" para controlar el dolor durante el trabajo de parto, pero en determinadas ocasiones la técnica está contraindicada o la analgesia es incompleta. El remifentanilo es un opioide potente de rápida acción y vida media ultracorta, que se adapta perfectamente a la dinámica del parto. La coordinación entre el comienzo de las contracciones y la administración del fármaco mediante un dispositivo PCA hacen que esta técnica pueda ser considerada de elección para el alivio de dolor durante el parto y no solo como alternativa a la epidural. Objetivo: este estudio pretende valorar la eficacia y seguridad en el parto del remifentanilo administrado por vía intravenosa, así como la satisfacción materna de la analgesia recibida. Materiales y métodos: estudio descriptivo prospectivo basado en el análisis de la recogida de datos realizado por los investigadores durante el parto donde se recoge el dolor durante la dilatación y el expulsivo antes y después de la aplicación de la PCA de remifentanilo, así como las complicaciones y la incidencia de efectos secundarios. Paralelamente se realiza una encuesta de satisfacción materna de la técnica recibida y su vivencia personal. Resultados: se han recogido un total de 32 casos durante el periodo de estudio (6 meses. Todas las pacientes han presentado una reducción de dolor manifestado por una disminución del EVA respecto del dolor basal de 5,9 puntos en los primeros minutos, 4,6 puntos en completa y 3,4 en el expulsivo. No se han registrado complicaciones materno-fetales importantes derivadas de la técnica. La satisfacción materna ha sido alta, volviendo incluso a repetir la técnica en un 90 % de los casos. Conclusiones: la PCA de remifentanilo ha demostrado ser efectiva y segura como analgesia obstétrica. Es por ello que la PCA ha teniendo una amplia aceptación entre matronas, ginecólogos y anestesiólogos en

  4. Xinjiang Integrates Mineral Resources of 11 Major Mining Areas

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    <正>According to reports,from this year,Xinjiang, a large mineral resource province,will implement mineral resource integration of 11 major mining areas involving minerals including coal, iron,copper and bentonite,so as to further adjust the structure of mineral exploitation and optimize the distribution of resources.

  5. 30 CFR 72.510 - Miner health training.

    Science.gov (United States)

    2010-07-01

    ... the Secretary of Labor, the Secretary of Health and Human Services, or from the authorized... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Miner health training. 72.510 Section 72.510... § 72.510 Miner health training. (a) Operators must provide annual training to all miners at a mine...

  6. Leukaemia and lymphoma among Czech uranium miners

    Energy Technology Data Exchange (ETDEWEB)

    Tomasek, L.; Malatova, I. [National Radiation Protection Institute, Prague (Czech Republic)

    2006-07-01

    Leukaemia is one of the most sensitive cancers in relation to ionizing radiation. It is surprising that in studies of uranium miners, no risk of leukaemia in relation to cumulated radon exposure was observed (Darby et al, 1995). However, when the risk among Czech uranium miners was analyzed in dependence on duration of exposure, the trend was significant. These results were based on 10 cases (Tomasek, 1993). Since then the original cohort of 4320 miners has been extended by another cohort, now including nearly 10 000 uranium miners and the follow-up is longer by 10 years. The present report aims to analyze the risk of haemopoietic cancers in the Czech cohort accounting for both external and internal doses, similarly as reported by Jacobi and Roth (1995), and using available data on metal content and airborne particulates for dose estimates.The present results of follow-up show that increased risk of leukaemia among uranium miners is significantly associated with cumulated equivalent red bone marrow doses which is dominated by exposures to long lived alpha radionuclides in airborne particulates. The increased mortality is mainly observed decades after exposure and is consistent with estimated internal dose to red bone marrow. The estimated risk coefficient for leukaemia is consistent with results from other studies, however, further studies are needed to reduce uncertainty in the risk estimates. (N.C.)

  7. Ilmenite Mineral's Recovery from Beach Sand Tailings

    International Nuclear Information System (INIS)

    The mineral ilmenite is the major source of rutile for industrial use and is of interest to paint and fertiliser industries. Enormous unutilised tailing dams lie on the eastern coast of the South Africa. Although covered by a simulation of the original indigenous vegetation, these tailings are still ilmenite bearing and of economic value. Tailings emanating from beach sand mineral slimes dams of the Kwazulu-Natal area (South Africa) have been processed. Screening, flotation, spiral concentration and magnetic separation methods were used either separately or successively. The present work sheds light on alternative routes for the extraction of the ilmenite, from these tailings. It moreover points out the usefulness of the Moessbauer spectroscopy in the mineral processing product monitoring. Tailings from the beach sands were used in the present study after the economic industrial minerals zirconia, ilmenite and rutile had been extracted in previous mining operations. About 61% natural ilmenite recovery was observed in the flotation concentrate of a Humphrey Spiral concentrate while a 62% recovery of hematite was found in the flotation tailings. The combination of screening, spiral concentration and magnetic separation, and flotation yielded a product with the highest ilmenite and hematite concentration being 71% and 19%, respectively. A natural ilmenite mineral, containing 87% ilmenite and 13% hematite, could be produced and extracted from the tailings of the flotation process, collected subsequently to the spiral concentration and the initial screening.

  8. Mineral wealth and the economic transition: Kazakhstan

    International Nuclear Information System (INIS)

    The exploitation of mineral wealth can amplify the problems of the transition economies in three basic ways. First, the rebound of the real exchange rate that characterises a successful transition may be augmented by the capital inflow required to expand mineral production. This can cause both recession in the short-run and lower growth in the medium-term. Second, when the mineral revenues expand, the Dutch Disease effects may intensify the transition-related shrinkage of the non-mining tradable sector, thereby retarding economic diversification and rendering the economy vulnerable to external shocks. Third, a mineral boom tends to concentrate revenue on the government, which may use it to postpone difficult decisions on economic reform and/or dissipate the revenue due to weak financial markets and inadequate public accountability. Kazakhstan, like oil-rich Azerbaijan, is a late reformer and displays evidence of a faster transition rebound than other less resource-rich countries in the CIS do. However, Kazakhstan has two advantages over Azerbaijan. First, Kazakhstan has a more diversified mineral endowment with which to counter any trend towards single commodity specialization. Second, Kazakhstan is making a later start on oil expansion so that it can learn from the experience of Azerbaijan. Priorities for Kazakhstan are the continuation of prudent economic policies, the creation of institutions to enhance the transparency of the revenue flows, and the use of environmental accounting to provide a rationale for the deployment of the oil rents. (author)

  9. Photochemistry of Nitrate Adsorbed on Mineral Dust

    Science.gov (United States)

    Gankanda, A.; Grassian, V. H.

    2013-12-01

    Mineral dust particles in the atmosphere are often associated with adsorbed nitrate from heterogeneous reactions with nitrogen oxides including HNO3 and NO2. Although nitrate ion is a well-studied chromophore in natural waters, the photochemistry of adsorbed nitrate on mineral dust particles is yet to be fully explored. In this study, wavelength dependence of the photochemistry of adsorbed nitrate on different model components of mineral dust aerosol has been investigated using transmission FTIR spectroscopy. Al2O3, TiO2 and NaY zeolite were used as model systems to represent non-photoactive oxides, photoactive semiconductor oxides and porous materials respectively, present in mineral dust aerosol. In this study, adsorbed nitrate is irradiated with 254 nm, 310 nm and 350 nm narrow band light. In the irradiation with narrow band light, NO2 is the only detectable gas-phase product formed from nitrate adsorbed on Al2O3 and TiO2. The NO2 yield is highest at 310 nm for both Al2O3 and TiO2. Unlike Al2O3 and TiO2, in zeolite, adsorbed nitrate photolysis to nitrite is observed only at 310 nm during narrow band irradiation. Moreover gas phase products were not detected during nitrate photolysis in zeolite at all three wavelengths. The significance of these differences as related to nitrate photochemistry on different mineral dust components will be highlighted.

  10. Impacts of Nickel Nanoparticles on Mineral Carbonation

    Directory of Open Access Journals (Sweden)

    Marius Bodor

    2014-01-01

    Full Text Available This work presents experimental results regarding the use of pure nickel nanoparticles (NiNP as a mineral carbonation additive. The aim was to confirm if the catalytic effect of NiNP, which has been reported to increase the dissolution of CO2 and the dissociation of carbonic acid in water, is capable of accelerating mineral carbonation processes. The impacts of NiNP on the CO2 mineralization by four alkaline materials (pure CaO and MgO, and AOD and CC steelmaking slags, on the product mineralogy, on the particle size distribution, and on the morphology of resulting materials were investigated. NiNP-containing solution was found to reach more acidic pH values upon CO2 bubbling, confirming a higher quantity of bicarbonate ions. This effect resulted in acceleration of mineral carbonation in the first fifteen minutes of reaction time when NiNP was present. After this initial stage, however, no benefit of NiNP addition was seen, resulting in very similar carbonation extents after one hour of reaction time. It was also found that increasing solids content decreased the benefit of NiNP, even in the early stages. These results suggest that NiNP has little contribution to mineral carbonation processes when the dissolution of alkaline earth metals is rate limiting.

  11. Cyanobacteria as Biocatalysts for Carbonate Mineralization

    Directory of Open Access Journals (Sweden)

    Christer Jansson

    2012-10-01

    Full Text Available Microbial carbonate mineralization is widespread in nature and among microorganisms, and of vast ecological and geological importance. However, our understanding of the mechanisms that trigger and control processes such as calcification, i.e., mineralization of CO2 to calcium carbonate (CaCO3, is limited and literature on cyanobacterial calcification is oftentimes bewildering and occasionally controversial. In cyanobacteria, calcification may be intimately associated with the carbon dioxide-(CO2 concentrating mechanism (CCM, a biochemical system that allows the cells to raise the concentration of CO2 at the site of the carboxylating enzyme ribulose 1,5-bisphosphate carboxylase/oxygenase (Rubisco up to 1000-fold over that in the surrounding medium. A comprehensive understanding of biologically induced carbonate mineralization is important for our ability to assess its role in past, present, and future carbon cycling, interpret paleontological data, and for evaluating the process as a means for biological carbon capture and storage (CCS. In this review we summarize and discuss the metabolic, physiological and structural features of cyanobacteria that may be involved in the reactions leading to mineral formation and precipitation, present a conceptual model of cyanobacterial calcification, and, finally, suggest practical applications for cyanobacterial carbonate mineralization.

  12. Calderas and mineralization: volcanic geology and mineralization in the Chianti caldera complex, Trans-Pecos Texas

    Energy Technology Data Exchange (ETDEWEB)

    Duex, T.W.; Henry, C.D.

    1981-01-01

    This report describes preliminary results of an ongoing study of the volcanic stratigraphy, caldera activity, and known and potential mineralization of the Chinati Mountains area of Trans-Pecos Texas. Many ore deposits are spatially associated with calderas and other volcanic centers. A genetic relationship between calderas and base and precious metal mineralization has been proposed by some and denied by others. Steven and others have demonstrated that calderas provide an important setting for mineralization in the San Juan volcanic field of Colorado. Mineralization is not found in all calderas but is apparently restricted to calderas that had complex, postsubsidence igneous activity. A comparison of volcanic setting, volcanic history, caldera evolution, and evidence of mineralization in Trans-Pecos to those of the San Juan volcanic field, a major mineral producer, indicates that Trans-Pecos Texas also could be an important mineralized region. The Chianti caldera complex in Trans-Pecos Texas contains at least two calderas that have had considerable postsubsidence activity and that display large areas of hydrothermal alteration and mineralization. Abundant prospects in Trans-Pecos and numerous producing mines immediately south of the Trans-Pecos volcanic field in Mexico are additional evidence that ore-grade deposits could occur in Texas.

  13. La doble recepción del spinozismo en alemania durante el siglo XVIII

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    María Jimena Solé

    2010-12-01

    Full Text Available Este artículo reconstruye la recepción del pensamiento de Spinoza en Alemania desde 1670 hasta 1789 y propone una nueva interpretación de este proceso. Sostenemos que la recepción del spinozismo en Alemania durante este periodo es controlado por una imagen de esta doctrina, que la presenta esencialmente como ateísta. Creemos que esta caracterización del spinozismo como un ateísmo recubre dos constelaciones problemáticas diferentes. Por un lado, se refiere a la incompatibilidad de la filosofía spinoziana con el teísmo y remite a los peligros que ésta representa para el orden religioso, moral y político basado en la existencia de un Dios teísta. El problema que subyace es, por lo tanto, la cuestión de los fundamentos metafísicos necesarios para sostener un determinado orden. Por otro lado, Spinoza es denunciado como un ateísta por su intención de demostrar racionalmente la existencia de Dios, por sostener que la razón humana es capaz de accede a la verdad sin auxilio externo, sin iluminación sobrenatural. Este Segundo aspecto de la recepción del spinozismo se superpone con la discusión acerca de los alcances y límites de la razón humana y, por lo tanto, con el núcleo mismo de la Ilustración.This article reconstructs the reception of Spinoza's thought from 1670 up to 1789 in Germany and proposes a new interpretation of this process. We argue that the reception of Spinozism en Germany during this period is controlled by an image of this doctrine, which depicts it essentially as atheist. We think that the characterization of spinozism as atheism covers two different problematic constellations. On the one hand, it refers to the incompatibility of Spinoza's philosophy with theism and remits to the dangers that it represents for the religious, moral and political order based on the existence of a theistic God. The problem that underlies this fight against Spinoza is, therefore, the problem of the metaphysical foundation

  14. Madres sociales de la aldea: la maestra española durante el nacional-catolicismo

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    Sonsoles San Román Gago

    2015-06-01

    Full Text Available Mi objetivo es señalar cómo asumen la evolución de modelos culturales dos espacios histórico-generacionales de maestras formadas antes y después de la Guerra Civil que ejercen durante el nacional-catolicismo en escuelas públicas de aldeas rurales. Quiero situar el artículo en un marco que permita comprender formación de identidades desde la perspectiva del cambio social y la asimilación a los modelos culturales. Entiendo que para esas maestras los inicios en su profesión son claves para comprender en qué medida cambios sociales y modelos educativos moldean identidades por sesgo generacional. Me propongo captar identidades de género para indagar su función regeneracionista como madres sociales de la aldea. He seleccionado para ello dos diarios de maestras representativas en dos periodos históricos. La metodología cualitativa ha sido utilizada para comprender la construcción social de las identidades de la maestra a través del análisis del texto escrito y poder así contextualizar el significado del cambio social con el análisis de su propio discurso, el texto escrito. Mis hipótesis son: 1 el momento en que empiezan a ejercer es importante para comprender cómo asumen la evolución de los modelos culturales; 2 la forma en que han asimilado las fases históricas del nacional-catolicismo en aldeas rurales moldea sus estructuras psicológicas; 3 la adaptación a la cultura de las aldeas va produciendo identidades sociales y de género. He llegado a las siguientes conclusiones: 1 la maestra es una pieza clave para comprender la evolución de los modelos culturales; 2 conocer lo que quieren recordar o silenciar permite captar el modo en que han asumido o rechazado los modelos ideológicos del nacional-catolicismo; 3 el sentido que dan a lo vivido va señalando significantes que permiten comprender el modo en que han socializado a las siguientes generaciones.

  15. MONITORAMENTO DA TEMPERATURA NO INTERIOR DE CHAPAS AGLOMERADAS DURANTE O PROCESSO DE PRENSAGEM

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    Elio José Santini

    2005-03-01

    Full Text Available O objetivo do presente trabalho foi analisar o comportamento da temperatura nas faces e no miolo de chapas de partículas aglomeradas, coladas com 8% de adesivo (base peso seco das partículas tanino-formaldeído. As chapas foram produzidas com três repetições por tratamento, com massa específica nominal de 0,7 g/cm³ e pressão específica de prensagem de 27 kgf/cm². Os tratamentos basearam-se na utilização de flocos de pinus (Pinus elliottii e partículas de eucalipto (Eucalytus sp, sendo que os flocos de pinus apresentavam três diferentes comprimentos nominais (40, 75 e 110 mm e duas espessuras (0,5 e 1,0 mm. Também foram analisados duas temperaturas de prensagem (140 e 180°C e dois teores de umidade nominal do colchão (17 e 21%. A temperatura no interior dos painéis durante a prensagem foi obtida por meio de fios para termopares tipo K (cromo-alumel. Os gráficos da temperatura em função do tempo de prensagem mostraram uma rápida elevação da temperatura nos primeiros 100 segundos de prensagem, mantendo-se num plateau possivelmente após atingir a temperatura de ebulição da água. A temperatura voltou a aumentar, de forma mais gradual, após a perda de grande parte da umidade do colchão. Observa-se que colchões formados por flocos de maior espessura apresentaram elevação mais rápida de temperatura no miolo. O principal fator que influenciou na velocidade de elevação da temperatura no miolo dos painéis aglomerados foi o teor de umidade do colchão, sendo que quanto maior o teor de umidade, mais rápida foi a elevação da temperatura.

  16. Hipertemia durante el fenómeno de el niño, 1997-98

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    Jaime Miranda M

    2003-10-01

    Full Text Available Objetivo: Describir el cuadro clínico y la evolución de los casos de síndrome febril presentados durante el fenómeno de "El Niño" de 1997-98, y presentar una revisión de la fisiopatología del cuadro de hipertermia. Material y métodos: Se realizó un estudio descriptivo longitudinal en la ciudad de Chimbote, Ancash. Se definió como caso de síndrome febril: niños menores de 5 años con fiebre refractaria al uso de antipiréticos sin foco aparente de infección. En el análisis posterior se consideraron: apariencia no tóxica, previamente sano, sin foco de infección al examen físico y con examen de laboratorio negativo. Resultados: Fueron estudiados 25 casos (68% varones, 80% con edades entre 5 y 18 meses con un tiempo de enfermedad promedio de 15,17(13,52 días ± desviación stándar (±DS. La mediana de la temperatura fue 38,8ºC con un promedio de 38,84ºC (rango 38 - 40ºC. 68% tuvo un tiempo de enfermedad mayor de 15 días; 52% había visitado al menos una vez un centro médico anterior; 68% recibió antibióticos y antipiréticos; y, 52 % ingresó al hospital por emergencia. Todos los casos presentaron alza térmica, asociado a piel seca (72%, diarrea (64%, tos (52%, baja de peso (52%, irritabilidad (44%, náuseas o vómitos (40%, rinorrea (24% y convulsiones (20%. El tiempo de hospitalización promedio fue 4,7 días y el estado febril promedio fue 2,5 días. Ninguno tuvo examen de laboratorio compatible con causa infecciosa. Conclusiones: En situaciones ambientales adversas debe considerarse al calor ambiental como un factor importante en el desarrollo de la hipertermia, con el propósito de brindar un manejo más apropiado a los afectados en el menor tiempo posible.

  17. Judíos extranjeros en el reino de Valencia durante la Baja Edad Media

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    Hinojosa Montalvo, José

    2010-06-01

    Full Text Available During the Late Middle Ages, Valencia became an important business centre, where foreign Jews arrived to the city to trade. It was a commerce that, apart from the land route, preferably used the seaway, even though of the risks of piracy. They and their goods came protected by a safe-conduct from the general Baile of the kingdom. The role of the conversos was very important in their commercial contacts. Apart from the Portuguese Jews, which I took care of in another study, they were predominantly North Africans, others adding up from the Granadan Sultanate, the Mediterranean islands (Sardinia, Sicily and Malta, Provence and Germany. A list of these Jews documented in Valencian sources, as well as an unpublished document that illustrates the activity of a Portuguese Jew in Valencia is attached as an appendix.

    Durante la Baja Edad Media la ciudad de Valencia se convirtió en un importante emporio mercantil, lo que propició que a ella acudieran a negociar judíos extranjeros. Era un comercio que, además de la vía terrestre, utilizaba la vía marítima, a pesar de los riesgos de la piratería. Ellos y sus mercancías venían protegidos por un salvoconducto del baile general del reino. En sus contactos comerciales fue importante el papel de los conversos valencianos. Además de los judíos portugueses, de los que me ocupé en otro estudio, predominaban los norteafricanos, a los que se añadían los del sultanato de Granada, islas del Mediterráneo (Cerdeña, Sicilia y Malta, Provenza y Alemania. Se incluye una lista de estos judíos mencionados en fuentes valencianas, y un documento inédito que ilustra la actividad de un judío portugués en Valencia.

  18. La actividad alfarera en la ciudad de León durante los siglos medievales

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    Martínez Peñín, Raquel

    2011-12-01

    Full Text Available This work aims to provide a multifocal and progressive view of the development of pottery making in the city of León and its outskirts during the Middle Ages. The objective is to analyze the characteristics of the production over the period in question, studying the changes and the survivals. To this end we are aided by a threefold supply of information: first, the documentary references, not only from medieval times but also the beginning of the Modern Age. Second, the information coming from the recent archaeological work carried out at various sites in the city and its immediate surroundings. And finally, especially for the analysis of technological evolution, the data provided by the different macroand microscopic analyses performed on a series of ceramic vessels unearthed at various archaeological contexts with clarifi catory stratigraphic sequences.

    Este trabajo trata de ofrecer una visión multifocal y evolutiva sobre el desarrollo de la actividad alfarera en la ciudad de León y su alfoz durante los siglos medievales. El objetivo es analizar las características de la producción a lo largo del período acotado, estudiando los cambios y las pervivencias. Para tal fin contamos con un triple soporte informativo: en primer lugar, las referencias documentales, no sólo de época medieval sino también de comienzos de la Edad Moderna. En segundo, la información emanada de las recientes intervenciones arqueológicas desarrolladas en distintos solares de la urbe y de su entorno más inmediato. Y, finalmente, sobre todo para el análisis de la evolución tecnológica, los datos proporcionados por los diferentes análisis macro y microscópicos realizados a una serie de recipientes cerámicos exhumados en diversos contextos arqueológicos que cuentan con secuencias estratigráficas aclaratorias.

  19. Rendimiento de cerdos alimentados con raciones conteniendo subproductos de arroz, durante la fase de crecimiento

    Directory of Open Access Journals (Sweden)

    Victor Hurtado N

    2011-04-01

    Full Text Available Objetivo. Evaluar el rendimiento de cerdos alimentados con raciones conteniendo subproductos de arroz durante la fase de crecimiento. Materiales y métodos. Fueron utilizados 40 lechones mestizos de 31.26 ± 4.62 kg, distribuidos en un diseño experimental de bloques al azar, con los siguientes tratamientos 1. Control, ración basal; 2. Ración con 100% de sustitución de maíz por arroz partido; 3. Ración con 50% de sustitución de maíz por arroz partido; 4. 100% de substitución de maíz por harina de arroz integral y 5. Ración con 50% de substitución de maíz por harina de arroz integral. Resultados. En todas las fases evaluadas (I, II y fase total fue observado un pobre desempeño de los cerdos alimentados con las raciones conteniendo harina de arroz integral, con efectos negativos más evidentes cuando el maíz fue totalmente sustituido por este subproducto (1.467 kg de consumo diario de ración y 0.512 kg de ganancia diaria de peso. La sustitución total o parcial de maíz por arroz partido no afectó el desempeño de los cerdos en crecimiento (1.681 y 1.733 kg de consumo diario de ración y 0.703 y 0.708 kg de ganancia de peso respectivamente. La peor conversión alimenticia (2.87 fue obtenida con la sustitución total del maíz por harina de arroz integral. Conclusiones. El maíz puede ser substituido en 100% en raciones para cerdos en crecimiento por arroz partido y en 50% por harina de arroz integral sin perjudicar La ganancia de peso, el consumo de ración y La conversión alimenticia.

  20. Comportamento da criança durante videonasofaringolaringoscopia: análise de 105 pacientes

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    Tsuji Domingos H.

    2002-01-01

    Full Text Available Introdução e objetivos: Este trabalho tem como objetivos estudar o comportamento da criança ao ser submetida a videonasofaringolaringoscopia - e a eficiência da rotina adotada pelos autores para sua realização - e descrever a rotina do exame, contribuindo para sua melhor execução por outros profissionais da área médica. Forma do estudo: Prospectivo clínico randomizado. Material e Método: O presente estudo foi realizado com 105 crianças e adolescentes, cuja faixa etária variou de 1 a 15 anos, sendo a média de 7,3 anos, submetidos a endoscopia nasal e/ou faringolaríngea com endoscópio flexível. Resultados: O índice de sucesso do procedimento foi de 99,04% - em apenas uma das crianças foi impossível a execução da endoscopia. A ocorrência de náusea não impediu a boa avaliação da laringe, estando presente em apenas 6,7% dos casos. O choro ocorreu em alguma das fases da rotina de exame em 24,76% do total de pacientes: em 42,10% das crianças de 0 a 5 anos (Grupo I; em 20,93% das de 6 a 10 anos (Grupo II; e em 0,00% dos adolescentes de 11 a 15 anos (Grupo III. A cavidade nasal foi a região mais relacionada com tal ocorrência, correspondendo a 80% dos casos que choraram durante o exame. Conclusão: Ao findarmos a pesquisa, concluímos que a videonasofaringolaringoscopia flexível é muito eficiente segundo a rotina adotada e que a tolerância do paciente mostrou-se proporcional a sua idade.

  1. La violencia sexual en la retaguardia republicana durante la Guerra Civil española

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    Adriana Cases Sola

    2014-10-01

    Full Text Available Este artículo ofrece una interpretación sobre la violencia sexual ejercida contra las mujeres en la retaguardia republicana durante la Guerra Civil. Este tipo de violencia se ha incluido en lo que algunas investigadoras han denominado como “violencias sexuadas”, un conjunto de violencias específicas destinadas exclusivamente a las mujeres. A través del estudio del caso de Piedad Suárez de Figueroa Moya, analizamos la violencia sexual infligida en la retaguardia republicana como parte de la violencia revolucionaria y de la estrategia de limpieza política desplegada por los comités al margen del poder republicano legítimo. Intentamos por lo tanto, ir más allá de la interpretación de las violaciones de guerra como la conquista del territorio a través del cuerpo de las mujeres del enemigo e introducimos una lectura política de las mismas elevando a las víctimas a la categoría de enemigas.Palabras clave: violencia sexual, Guerra Civil española, retaguardia republicana, violencia revolucionaria.__________________________Abstract:This paper offers an interpretation about sexual violence against women on republican rearguard during the Spanish Civil War. This kind of violence has been included in what some researchers have called “sexed violence”, a group of specific types of violence destined exclusively to women. Through the study of the case of Piedad Suárez de Figueroa Moya, we are going to analyse sexual violence wreaked on republican rearguard as a part of revolutionary violence and strategy of political cleansing carried out by unlawful republican committees. We are trying to go beyond the interpretation of war rape as a conquest of territory through the body of the enemy’s women. And finally we are going to introduce a political view of these rapes that turns victims into enemies.Keywords: Sexual Violence, Spanish Civil War, Republican Rearguard, Revolutionary Violence.

  2. Efeito de bioterápico na eosinofilia durante a SLMV experimental

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    Luciana Camillo

    2014-09-01

    Full Text Available O Toxocara canis (Tc é um parasito pertencente ao filo Nematódeo que possui como hospedeiro definitivo os cães, O homem é hospedeiro paratênico e contamina-se acidentalmente ao ingerir ovos contendo larvas infectantes (L3 do parasito, as quais são liberadas e atravessam a mucosa intestinal, atingem a circulação, Durante este processo migratório, antígenos de excreção e secreção (TES são liberados provocando intensa reação inflamatória, do tipo Th2, caracterizando a síndrome, denominada Larva Migrans Visceral (SLMV, As principais características desta doença crônica são as eosinofilias sanguínea e tecidual persistentes, Desse modo, torna-se importante a busca por terapias que contribuam com a redução dos quadros inflamatórios com intensa eosinofilia, Assim, o uso deste bioterápico, produzido a partir do extrato antigênico de ovos e larvas de (Tc, e seu efeito no recrutamento de leucócitos totais, células mononucleares e eosinófilos no sangue, para o espaço broncoalveolar e para a cavidade peritoneal de camundongos infectados pelo (Tc foi investigado, Foram utilizados camundongos fêmeas (Swiss, divididos nos grupos: Controle (C, Infectado (Tc, Imunizado (Im+Tc e Tratado (Tc+Bio, Os animais Tc, Im+Tc e Tc+Bio receberam 500 ovos/animal por gavagem, Posteriormente, os animais foram eutanasiados no 18º dia da infecção e o número das células nos compartimentos foi determinado, Os resultados obtidos demonstraram que, Im+Tc, assim como nos Tc+Bio tiveram redução significativa dessas células nos compartimentos analisados quando comparados grupo Tc, Assim, sugeriu-se que a bioterapia modulou negativamente o recrutamento de células inflamatórias, principalmente eosinófilos no sangue, pulmão e intestino demonstrando um potencial anti-inflamatório desse bioterápico na SLMV experimental.

  3. Usos de Twitter durante el 15M. El caso de la prensa catalana

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    Juan Linares-Lanzman

    2015-03-01

    Full Text Available Durante las primeras manifestaciones del 15M o movimiento de los indignados, miles de usuarios españoles se registran en Twitter a la vez que se multiplican las informaciones sobre el movimiento en este medio. Estas servían al 15M para organizar y difundir, muchas veces en tiempo real, asuntos relevantes sobre las convocatorias. Este artículo es un caso de estudio que muestra algunos usos periodísticos de Twitter en este periodo y para el caso del 15M en Cataluña, considerando que la Acampada de Barcelona fue una de las principales del movimiento. El objetivo es explorar cómo fueron las rutinas de las redacciones periodísticas en Twitter, y si se produce y cómo una hibridación de funciones entre periodistas y usuarios. Hemos realizado entrevistas a los periodistas de las principales redacciones catalanas junto al análisis de contenido de algunos tweets publicados entre el 15 de mayo y el 19 de junio de 2011, periodo conocido como de “explosión del movimiento”. Los resultados de este artículo sugieren que, motivados por una alta necesidad de información sobre lo que estaba sucediendo, los periodistas optaron por buscar en Twitter nuevas fuentes, en especial en la red del 15M, constituida por nodos de las acampadas y de Democracia Real Ya, la plataforma convocante de la manifestación del 15 de mayo de 2011. Durante el 15M se instala una rutina periodística que supera la lógica de solo acceder y dar credibilidad a las fuentes informativas previamente reconocidas, como las agencias de noticias y otros medios, consiguiéndose una nueva forma que permite a los periodistas otorgar más amplitud y profundidad a las noticias e informaciones sobre el 15M. Este hecho ofrece la necesidad de pensar en modelos de periodismo del tipo participativo, donde los medios sociales y algunas funciones periodísticas tradicionales pueden ser ejercidas por otros usuarios, incluso desconocidos, que actúan desde fuera de las redacciones. During the

  4. Desplazamiento de un implante dental dentro del seno maxilar durante la segunda fase quirúrgica

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    I Gallego Medina

    2002-07-01

    Full Text Available La rehabilitación bucal de los pacientes con edentulismo parcial o total con implantes dentales tiene amplias indicaciones que en ocasiones se ven limitadas por factores anatómicos y biológicos. Una de las localizaciones en la que frecuentemente puede existir una altura insuficiente de hueso alveolar, ya sea debido a la reabsorción ósea, a la excesiva neumatización del seno maxilar o a ambas causas, es la zona posterior del maxilar superior, lo que además suele ir acompañado de una baja calidad ósea. Todo esto hace que tanto la técnica quirúrgica convencional u otros procedimientos alternativos, como la elevación del seno maxilar, injertos en onlay, el uso de osteotomos y la osteotomia de Le Fort I, sean procedimientos quirúrgicos necesarios en muchas ocasiones para poder solucionar un caso de rehabilitación bucal con implantes. Por otra parte estas técnicas pueden alterar la anatomía y la fisiología del seno maxilar favoreciendo la aparición de complicaciones intra y postquirúrgicas. Una de las posibles complicaciones, aunque rara, es el desplazamiento del implante dentario hacia el seno maxilar durante la segunda fase quirúrgica, como es el caso que describimos en este artículo.The oral rehabilitation of the patients with partial or total edentulism with the use of dental implants has wide applications. In occasions, these applications are limited by anatomical and biological factors. Concretely, the posterior area of the maxilla can have a scarce height of residual ridge, besides a poor bony quality and further pneumatization of the maxillary sinus. All this makes that so much the conventional surgical technique as other alternatíve procedures as sinus lift, onlay graft, the technique with osteotoms and the osteotomy of Le Fort l, be surgical procedures that can change the anatomy and physiology of the maxillary sinus favoring the appearance of complications. One of the possible but rare complications is the displacement

  5. A Review of Mineral Resources and GIS Applications in Mineral Resource Assessment in Northeast China

    Institute of Scientific and Technical Information of China (English)

    Zhou Yunxuan; Wang Lei; Liu Wansong; Xu Huiping; Sun Fengyue

    2000-01-01

    Northeast China is one of the regions in China that possesses a great abundance of mineral resources.Coal, petroleum, natural gas, gold, iron, magnesite, graphite, talc, molding sand, glass sand and some others account for large portion in reserves and yields of that in the whole country. The region faced also shortages of copper, molybdenum, oil shale, zirconium, tantalum, rare earth, and beryllium, although they have large reserves,but limited by economical and technical factors. Geological mapping and mineral exploration activities have been intensive. Only the north part of Daxinanling Mountains in the region leaves unexplored. GIS applications in mineral resource assessment in the region start not long. Databases for GIS applications are on the way of construction.Well - trained technical staff and expertise do not meet the demand.This article reviews the situation of mineral resources and GIS applications for mineral resource assessment in the region. Suggestions on multi - lateral cooperation and GIS training are also made.

  6. Injury experience in metallic mineral mining, 1989

    Energy Technology Data Exchange (ETDEWEB)

    1990-01-01

    This Mine Safety and Health Administration (MSHA) informational report reviews in detail the occupational injury and illness experience of metallic mineral mining in the the United States for 1989. Data reported by operators of mining establishments concerning work injuries are summarized by work location, accident classification, part of body injured, nature of injury, occupation, and principal type of mineral. Related information on employment, worktime, and operating activity also is presented. Data reported by independent contractors performing certain work at mining locations are depicted separately in this report. For ease of comparison with other metal and nonmetallic mineral mining industries and with coal mining, summary reference tabulations are included at the end of both the operator and the contractor sections of this report. 3 figs., 46 tabs.

  7. Injury experience in metallic mineral mining, 1992

    Energy Technology Data Exchange (ETDEWEB)

    1994-05-01

    This Mine Safety and Health Administration (MSHA) informational report reviews in detail the occupational injury and illness experience of metallic mineral mining in the United States for 1992. Data reported by operators of mining establishments concerning work injuries are summarized by work location, accident classification, part of body injured, nature of injury, occupation, and principal type of mineral. Related information on employment, worktime, and operating activity also is presented. Data reported by independent contractors performing certain work at mining locations are depicted separately in this report. For ease of comparison with other metal and nonmetallic mineral mining industries and with coal mining, summary reference tabulations are included at the end of both the operator and the contractor sections of this report.

  8. Injury experience in metallic mineral mining, 1991

    Energy Technology Data Exchange (ETDEWEB)

    1993-10-01

    This Mine Safety and Health Administration (MSHA) informational report reviews in detail the occupational injury and illness experience of metallic mineral mining in the United States for 1991. Data reported by operators of mining establishments concerning work injuries are summarized by work location, accident classification, part of body injured, nature of injury, occupation, and principal type of mineral. Related information on employment, worktime, and operating activity also is presented. Data reported by independent contractors performing certain work at mining locations are depicted separately in this report. For ease of comparison with other metal and nonmetallic mineral mining industries and with coal mining, summary reference tabulations are included at the end of both the operator and the contractor sections of this report.

  9. Ectopic mineral formation in the prostate gland

    Directory of Open Access Journals (Sweden)

    R.A.Moskalenko

    2011-01-01

    Full Text Available This work analyzes the data of cont emporary scientific literature regarding the ectopic mineralization in the prostate gland, its pathogenetic features are considered. The scientific literature of recent decades gives grounds to assert that the processes of concrement formation in the prostate gland are influenced by many factors, pathological mineralization can be realized by different mechanisms. They include chronic inflammation, stagnation fract ions in gland, reflux of urine from the urethra at intravesicle obstruction, malformation of prostate and seminal vesicles, specific inflammation, polymorphism of gene protein inhibitors of calcification. These mechanisms are interconnected, each of them may participate in the overall development of concrement fo rmation in the prostate. In recent years, due to improved instrumental diagnosis we observe a significant increase of the number of patients, who were found with pathogenic prostate gland biol iths, which requires more detailed and in-depth study of the mechanisms of mineral formation in the prostate.

  10. Biogeochemical interactions during the biobeneficiation of minerals

    Science.gov (United States)

    Shrivastava, J.; Mudliar, P. S.; Mudliar, S. N.; Pandey, R. A.

    2009-04-01

    Mineral biotechnology is one of the wings of biotechnology involving integrated application of the knowledge and techniques of biochemistry, microbiology, genetics and chemical engineering to draw benefit at the technological level from the properties and capacities of microorganisms. It offers the possibility of recovering, refining and concentrating wide varieties of minerals for services essential to life and well being of mankind. It also helps in minimising the environmental damages with recourse to conserving the natural resources for future generation. The paper outlines possible microorganism-microorganism interaction, microorganism-mineral interactions and microorganism interactions with produced products of biobeneficiation especially with respect to copper waste tailings and coal containing pyretic sulphur. Keywords: Copper; Tailings; Coal; Pyrite; Thiobascillus ferrooxidans; Thiobascillus thiooxidans

  11. Utilization of milk minerals by Iberian suckling piglets

    OpenAIRE

    Castellano, R; Aguinaga, M. A.; R. Nieto; AGUILERA, J.F.; Haro, A; I. Seiquer

    2013-01-01

    Little information is available concerning mineral metabolism in suckling piglets. The utilization of milk minerals and the mineral composition of Iberian (IB) suckling piglets were studied in two consecutive experiments at different ambient temperatures (trial 1, 27 ± 2°C; trial 2, 22 ± 2°C). Milk composition and the piglets’ performance were determined weekly over a 34 days lactation period and, at the end, body mineral contents were analyzed and mineral retention and bioavailability were c...

  12. Wet High Intensity Magnetic Separation of Iron Minerals

    OpenAIRE

    Shao, Y.; Veasey, T. J.; Rowson, N. A.

    1996-01-01

    Four different iron minerals were selected for study, and five size fractions of each mineral were prepared. The magnetic properties of these minerals were measured. The effect of particle size and magnetic susceptibility on wet high intensity magnetic separation was studied simultaneously. It was found that hematite—1 was a strongly paramagnetic mineral, and the effect of particle size in WHIMS was not significant. Goethite and limonite were weakly paramagnetic minerals, and could not be eff...

  13. Phosphorus K-edge XANES spectroscopy of mineral standards

    OpenAIRE

    Ingall, Ellery D.; Brandes, Jay A.; Diaz, Julia M.; de Jonge, Martin D.; Paterson,David; McNulty, Ian; Elliott, W. Crawford; Northrup, Paul

    2010-01-01

    Phosphorus K-edge X-ray absorption near-edge structure (XANES) spectroscopy was performed on phosphate mineral specimens including (a) twelve specimens from the apatite group covering a range of compositional variation and crystallinity; (b) six non-apatite calcium-rich phosphate minerals; (c) 15 aluminium-rich phosphate minerals; (d) ten phosphate minerals rich in either reduced iron or manganese; (e) four phosphate minerals rich in either oxidized iron or manganese; (f) eight phosphate mine...

  14. Geoelectrical Signatures Of Microbial Stimulated Mineralization

    Science.gov (United States)

    Personna, Y. R.; Ntarlagiannis, D.; Slater, L.; O Brien, M.; Hubbard, S.; Williams, K. H.

    2007-05-01

    Bioremediation techniques are commonly utilized to address soil and groundwater contamination due to acid- mine drainage, industrial sources, and government nuclear weapon programs. One critical component of these efforts is the real time, spatially accurate monitoring of the remediation processes. For this reason non-invasive high resolution geophysical methods have been employed in the recent years to elucidate system transformations occurring during bioremediation. In our study, we performed laboratory column experiments to investigate the geoelectrical response of microbe-mediated iron sulfide (FeS) precipitation accompanying stimulated sulfate-reduction; a bioremediation technique currently utilized for the sequestration of heavy metals in the subsurface. In order to monitor the biomineralization process, we used two geoelectrical methods - induced polarization (IP) and self-potential (SP) - in conjunction with conventional geochemical measurements. The IP data showed significant anomalies associated with ongoing FeS mineralization accompanying microbial activity. The magnitude of the IP response can be considered a proxy for the mass of minerals accumulating in the pore space and may provide insight into the aggregation state of the mineralization. Additionally, strong SP anomalies developed during the mineralization as a result of the continuous redox state changes following the microbial induced mineral formation. Visibly black precipitates accumulated with the column indicating FeS precipitation, and high H2S content confirmed the observed geochemical and geophysical data. Overall, the results suggest that the IP and SP methods can be used to monitor the progress of the microbial induced mineralization process associated with the precipitation of insoluble metal sulfides, and indirectly monitor the microbial activity within the subsurface. These methods can be valuable tools to increase the efficiency of bioremediation techniques.

  15. Quantitative Measures of Mineral Supply Risk

    Science.gov (United States)

    Long, K. R.

    2009-12-01

    Almost all metals and many non-metallic minerals are traded internationally. An advantage of global mineral markets is that minerals can be obtained from the globally lowest-cost source. For example, one rare-earth element (REE) mine in China, Bayan Obo, is able to supply most of world demand for rare earth elements at a cost significantly less than its main competitors. Concentration of global supplies at a single mine raises significant political risks, illustrated by China’s recent decision to prohibit the export of some REEs and severely limit the export of others. The expected loss of REE supplies will have a significant impact on the cost and production of important national defense technologies and on alternative energy programs. Hybrid vehicles and wind-turbine generators, for example, require REEs for magnets and batteries. Compact fluorescent light bulbs use REE-based phosphors. These recent events raise the general issue of how to measure the degree of supply risk for internationally sourced minerals. Two factors, concentration of supply and political risk, must first be addressed. Concentration of supply can be measured with standard economic tools for measuring industry concentration, using countries rather than firms as the unit of analysis. There are many measures of political risk available. That of the OECD is a measure of a country’s commitment to rule-of-law and enforcement of contracts, as well as political stability. Combining these measures provides a comparative view of mineral supply risk across commodities and identifies several minerals other than REEs that could suddenly become less available. Combined with an assessment of the impact of a reduction in supply, decision makers can use these measures to prioritize risk reduction efforts.

  16. Characteristics of Lead Sorption by Zeolite Minerals

    Science.gov (United States)

    Al-Sewailem, M. S.

    Lead adsorption behavior was investigated using four Zeolite minerals (clinoptilolite, analcime, phillipsite and chabazite). The used Pb2+ concentrations were 0, 0.1, 0.5, 1.0, 2.0, 3.0 and 5 µmol mL-1. Results indicated that Pb2+ sorption followed the Langmuir adsorption isotherm, but over limited concentration ranges for clinoptilolite and analcime. The bindg energy (Kd) reached, 2.400 and 0.875 g L-1 for phillipsite and chabazite, respectively. The maximum adsorption capacity for such minerals reached 208.33 and 204.08 mg g-1 with correlation coefficient (R2) reached, 0.997 and 0.995, respectively. Meanwhile, two stages for Pb2+adsorption were observed with clinoptilolite and analcime in the low and high concentrations of the applied Pb2+. Data also was applicable to the Freundlich adsorption isotherm over the used entire Pb2+ concentration ranges. The binding energy (n) reached, 1.014, 1.005, 1.001 and 1.001 g L-1 for clinoptilolite, analcime, phillipsite and chabazite, respectively. However, the b values (maximum adsorption capacity) reached 202.582, 201.651, 207.062 and 206.871 mg g-1 with correlation coefficient (R2) nearly one for all studying minerals, respectively. Desorption data indicated that most of the sorbed Pb2+ was extractedin the 1st extraction following the adsorption experiment. The ability of the used zeolite minerals to retain Pb2+ was high and there were differences between the studied minerals in sorption of Pb2+. In conclusion, data eliminated that, zeolite minerals especially, philipsite and chabazite, could be successfully used as packing material in subsurface reactive barriers intercepting ground water plumes and for fixed bed reactors designed to remove Pb2+ from industrial wastewater.

  17. Development of industrial minerals in Colorado

    Science.gov (United States)

    Arbogast, Belinda F.; Knepper, Daniel H.; Langer, William H.; Cappa, James A.; Keller, John W.; Widmann, Beth L.; Ellefsen, Karl J.; Klein, Terry L.; Lucius, Jeffrey E.; Dersch, John S.

    2011-01-01

    Technology and engineering have helped make mining safer and cleaner for both humans and the environment. Inevitably, mineral development entails costs as well as benefits. Developing a mine is an environmental, engineering, and planning challenge that must conform to many Federal, State, and local regulations. Community collaboration, creative design, and best management practices of sustainability and biodiversity can be positive indicators for the mining industry. A better understanding of aesthetics, culture, economics, geology, climate, vegetation and wildlife, topography, historical significance, and regional land planning is important in resolving land-use issues and managing mineral resources wisely. Ultimately, the consuming public makes choices about product use (including water, food, highways, housing, and thousands of other items) that influence operations of the mineral industry. Land planners, resource managers, earth scientists, designers, and public groups have a responsibility to consider sound scientific information, society's needs, and community appeals in making smart decisions concerning resource use and how complex landscapes should change. An effort to provide comprehensive geosciences data for land management agencies in central Colorado was undertaken in 2003 by scientists of the U.S. Geological Survey and the Colorado Geological Survey. This effort, the Central Colorado Assessment Project, addressed a variety of land-use issues: an understanding of the availability of industrial and metallic rocks and minerals, the geochemical and environmental effects of historic mining activity on surface water and groundwater, and the geologic controls on the availability and quality of groundwater. The USDA Forest Service and other land management agencies have the opportunity to contribute to the sustainable management of natural aggregate and other mineral resources through the identification and selective development of mineral resources and the

  18. Estimation of palaeohydrochemical conditions using carbonate minerals

    Science.gov (United States)

    Amamiya, H.; Mizuno, T.; Iwatsuki, T.; Yuguchi, T.; Murakami, H.; Saito-Kokubu, Y.

    2014-12-01

    The long-term evolution of geochemical environment in deep underground is indispensable research subject for geological disposal of high-level radioactive waste, because the evolution of geochemical environment would impact migration behavior of radionuclides in deep underground. Many researchers have made efforts previously to elucidate the geochemical environment within the groundwater residence time based on the analysis of the actual groundwater. However, it is impossible to estimate the geochemical environment for the longer time scale than the groundwater residence time in this method. In this case, analysis of the chemical properties of secondary minerals are one of useful method to estimate the paleohydrochemical conditions (temperature, salinity, pH and redox potential). In particular, carbonate minerals would be available to infer the long-term evolution of hydrochemical for the following reasons; -it easily reaches chemical equilibrium with groundwater and precipitates in open space of water flowing path -it reflects the chemical and isotopic composition of groundwater at the time of crystallization We reviewed the previous studies on carbonate minerals and geochemical conditions in deep underground and estimated the hydrochemical characteristics of past groundwater by using carbonate minerals. As a result, it was found that temperature and salinity of the groundwater during crystallization of carbonate minerals were evaluated quantitatively. On the other hand, pH and redox potential can only be understood qualitatively. However, it is suggested that the content of heavy metal elements such as manganese, iron and uranium, and rare earth elements in the carbonate minerals are useful indicators for estimating redox potential. This study was carried out under a contract with METI (Ministry of Economy, Trade and Industry) as part of its R&D supporting program for developing geological disposal technology.

  19. Whole shoot mineral partitioning and accumulation in pea (Pisum sativum

    Directory of Open Access Journals (Sweden)

    Renuka P Sankaran

    2014-04-01

    Full Text Available Several grain legumes are staple food crops that are important sources of minerals for humans; unfortunately, our knowledge is incomplete with respect to the mechanisms of translocation of these minerals to the vegetative tissues and loading into seeds. Understanding the mechanism and partitioning of minerals in pea could help in developing cultivars with high mineral density. A mineral partitioning study was conducted in pea to assess whole-plant growth and mineral content and the potential source-sink remobilization of different minerals, especially during seed development. Shoot and root mineral content increased for all the minerals, although tissue-specific partitioning differed between the minerals. Net remobilization was observed for P, S, Cu, and Fe from both the vegetative tissues and pod wall, but the amounts remobilized were much below the total accumulation in the seeds. Within the mature pod, more minerals were partitioned to the seed fraction (>75% at maturity than to the pod wall for all the minerals except Ca, where only 21% was partitioned to the seed fraction. Although there was evidence for net remobilization of some minerals from different tissues into seeds, continued uptake and translocation of minerals to source tissues during seed fill is as important, if not more important, than remobilization of previously stored minerals.

  20. Whole shoot mineral partitioning and accumulation in pea (Pisum sativum).

    Science.gov (United States)

    Sankaran, Renuka P; Grusak, Michael A

    2014-01-01

    Several grain legumes are staple food crops that are important sources of minerals for humans; unfortunately, our knowledge is incomplete with respect to the mechanisms of translocation of these minerals to the vegetative tissues and loading into seeds. Understanding the mechanism and partitioning of minerals in pea could help in developing cultivars with high mineral density. A mineral partitioning study was conducted in pea to assess whole-plant growth and mineral content and the potential source-sink remobilization of different minerals, especially during seed development. Shoot and root mineral content increased for all the minerals, although tissue-specific partitioning differed between the minerals. Net remobilization was observed for P, S, Cu, and Fe from both the vegetative tissues and pod wall, but the amounts remobilized were much below the total accumulation in the seeds. Within the mature pod, more minerals were partitioned to the seed fraction (>75%) at maturity than to the pod wall for all the minerals except Ca, where only 21% was partitioned to the seed fraction. Although there was evidence for net remobilization of some minerals from different tissues into seeds, continued uptake and translocation of minerals to source tissues during seed fill is as important, if not more important, than remobilization of previously stored minerals.

  1. Geoethical approach to mineral activities in Antarctica

    Science.gov (United States)

    Talalay, Pavel

    2013-04-01

    Antarctica is the outermost from civilization space continent. From 14.0 million km2 of surface area about 98% of Antarctica is covered by ice that averages at least 1.6 km in thickness. Geologically, the continent is the least explored in the world, and it is almost absolutely unknown what mineral resources Antarctica has as they are buried in rock that is covered by a thick ice sheet. It is thought to have large and valuable mineral deposits under the ice. This is because of what has been found in samples taken from the small areas of rock that are exposed, and also from what has been found in South Africa and South America. Up until 180 million years ago, Antarctica was a part of the Gondwanaland super continent, attached to South America, the Southern part of Africa, India and Australia, these continents then drifted apart until they reached their current positions. This leads to a possibility that Antarctica may also share some of the mineral wealth of these continents. Right now on the ice-free areas of Antarctica iron ore, chromium, copper, gold, nickel, platinum, coal and hydrocarbons have been found. The Protocol on Environmental Protection to the Antarctic Treaty, also known as the Madrid Protocol, was signed in 1991 by the signatories to the Antarctic Treaty and became law in January 1998. The Protocol provides for comprehensive protection of the Antarctic environment and associated ecosystems and includes a ban on all commercial mining for at least fifty years (this is up for review in 2041). Current climate change and melting ice in Polar Regions is opening up new opportunities to exploit mineral and oil resources. Even Antarctica's weather, ice and distance from any industrialized areas mean that mineral extraction would be extremely expensive and also extremely dangerous, the depletion of mineral recourses on the Earth can reverse banning of mining in Antarctica in future. There is no question that any resource exploitation in Antarctica will cause

  2. French mineral exploration, 1973-82

    International Nuclear Information System (INIS)

    Both private and government-controlled organizations play significant roles in French mineral exploration. This chapter reviews French exploration from 1973 to 1982, a period in which exploration expenditures increased significantly. It begins by examining aggregate exploration expenditures for the period, as well as the allocation of funds according to geographic area and mineral type, and then identifies several influences upon these expenditure trends. The chapter concludes by looking at the productivity of French exploration and making tentative international comparisons. French uranium exploration is detailed

  3. Radioactive minerals - Multimedias strategies for their divulgation

    Science.gov (United States)

    Cabral, João; Gomes, Ana; Aldano, Ana; Fonseca, Pedro; Cabral, Tiago; Nobre, José

    2014-05-01

    The region corresponding to Sortelha-Penalobo - Bendada, located deep in the transition zone between the Hesperian massif and the Cova da Beira in the central part of Portugal, more specifically in the Mountainous region of the province of Beira Alta, county Sabugal. This region is characterized by great mineral wealth combined with geomorphology of recognized landscape value. Under the scientific point of view, this region is the origin of the mineral sabugalite (HAl(UO2)4(PO4)4.16H2O) that was described by the famous American mineralogist Clifford Frondel (1907-2002) in the fifties of the 20th century. Uranium minerals of Sabugal region were also associated with the radioactivity studies made by the well-known French physicist Marie Curie (1867-1934). In 2007, U. Kolitsch et al described the Bendadaite (Fe (AsO4) 2 (OH) 2 • 4H2O), which corresponds to a new mineral from the group arthurite. The mineral wealth of this region is responsible for a rich history of mining and to highlight the importance until the 1990s the extraction of uranium minerals. The main uranium minerals extracted were the tobernite (Cu (UO2) 2 (PO4) 2 • 12 H2O), the metatobernite (Cu (UO2) 2 (PO4) 2 • 8 H 2 O), the autonite (Ca (UO2) 2 (PO4 ) 2 • 12H2O-10) and sabugalite (HAL (UO2) 4 (PO4) 4 16H2O). Due to the high radioactivity of these minerals, their handling becomes infeasible for disclosure purposes. An integrated and multidisciplinary museological strategy aims to access 3D images by QR codes, using multitouch as the primary means of interaction with the user, and can handle even the virtual samples, access various magnifications and enjoy explanations supplied by a mascot, in a fun way. All this framework and geological environment becomes an asset for the scientific, educational and economic development of the region. On the other hand, it has a vital importance in the context of a strategy of forming a geological park, in the point of view of tourism, research and

  4. Mineral resource of the month: arsenic

    Science.gov (United States)

    Brooks, William E.

    2008-01-01

    Arsenic has a long and varied history: Although it was not isolated as an element until the 13th century, it was known to the ancient Chinese, Egyptians and Greeks in compound form in the minerals arsenopyrite, realgar and orpiment. In the 1400s, “Scheele’s Green” was first used as an arsenic pigment in wallpaper, and leached arsenic from wallpaper may have contributed to Napoleon’s death in 1821. The 1940s play and later movie, Arsenic and Old Lace, dramatizes the metal’s more sinister role. Arsenic continues to be an important mineral commodity with many modern applications.

  5. Structure of chitosan gels mineralized by sorption

    Science.gov (United States)

    Modrzejewska, Z.; Skwarczyńska, A.; Douglas, T. E. L.; Biniaś, D.; Maniukiewicz, W.; Sielski, J.

    2015-10-01

    The paper presents the structural studies of mineralized chitosan hydrogels. Hydrogels produced by using sodium beta-glycerophosphate (Na-β-GP) as a neutralizing agent. Mineralization was performed method "post loading", which consisted in sorption to the gels structure Ca ions. In order to obtain - in the structure of gels - compounds similar to the hydroxyapatites present naturally in bone tissue, gels after sorption were modified in: pH 7 buffer and sodium hydrogen phosphate. In order to determine the structural properties of the gels, the following methods were used: infrared spectroscopy with Fourier transformation, FTIR, X-ray diffractometry, XRD, scanning electron microscopy, SEM.

  6. Radiological safety of bone mineral densitometry equipment

    International Nuclear Information System (INIS)

    Osteoporosis is a highly prevalent disease leading to increased risk of bone fractures. Bone mineral densitometry (BMD) is a well accepted clinical tool for the diagnosis and management of osteoporosis. There are several different modalities for BMD such as Dual Energy X-ray Absorptiometry, Quantitative Ultrasound, Radiographic Absorptiometry and Quantitative Computerized Tomography. Measurement of bone mineral density (BMD) by dual energy X-ray absorptiometry (DXA) is now well established as the method of choice for osteoporosis assessment. This study was conducted to assess the radiation dose to patients and staff from the standard scan modes

  7. Minerals with metal-organic framework structures

    Science.gov (United States)

    Huskić, Igor; Pekov, Igor V.; Krivovichev, Sergey V.; Friščić, Tomislav

    2016-01-01

    Metal-organic frameworks (MOFs) are an increasingly important family of advanced materials based on open, nanometer-scale metal-organic architectures, whose design and synthesis are based on the directed assembly of carefully designed subunits. We now demonstrate an unexpected link between mineralogy and MOF chemistry by discovering that the rare organic minerals stepanovite and zhemchuzhnikovite exhibit structures found in well-established magnetic and proton-conducting metal oxalate MOFs. Structures of stepanovite and zhemchuzhnikovite, exhibiting almost nanometer-wide and guest-filled apertures and channels, respectively, change the perspective of MOFs as exclusively artificial materials and represent, so far, unique examples of open framework architectures in organic minerals.

  8. An Overview of Mineral Processing in China

    Institute of Scientific and Technical Information of China (English)

    曲恒磊; 周廉; 魏海荣; 赵永庆

    2001-01-01

    The latest progress in mineral processing in China is described. It is also pointed out that the existing techno logy can not meet the needs of economic development. The combined challenges of poor resources, economical benefits and environmental pollution issues require further research to upgrade the separation efficiency economically. The me thods of mineral processing should play a more important part in waste treatment such as wastewater treatment, the re mediation of contaminated soil and the recycling of wastes. Biomineral technology will be utilised in the near future.

  9. OXYGEN TENSION REGULATES PREOSTEOCYTE MATURATION AND MINERALIZATION

    OpenAIRE

    Zahm, Adam; Bucaro, Michael; Srinivas, Vickram; Shapiro, Irving M.; Adams, Christopher S.

    2008-01-01

    The goal of this investigation was to test the hypothesis that low pO2 regulates bone cell mineralization. MLO-A5 and MLO-Y4 cells were cultured in monolayer and alginate scaffolds in hypoxia (2% O2) or normoxia (20% O2). Reduction of the O2 tension from 20% to 2% resulted in reduced mineralization and decreased alkaline phosphatase activity of MLO-A5 cells in both monolayer and three-dimensional cultures. Similar changes in osteogenic activity were seen when these preosteocyte-like cells wer...

  10. PROBABILISTIC MINER'S RULE IN FATIGUE RELIABILITY

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Firstly, constant amplitude P-Sa-Sm-Nc surface family is established. Secondly, four basic assumptions, i.e., monotonically increasing, non-coupling, separability and nonintersecting of fatigue damage accumulation are proposed from the viewpoint of both damage mechanics and fracture mechanics. Then the individual isodamage D-Sa-Sm-N surface under constant amplitude loading is constructed and the two-dimensional individual Miner's rule is derived. Consequently, the two-dimensional probabilistic Miner's rule (TPMiner) is established and proved for a population subjected to variable amplitude loading. Finally, with successfully experiment verification, TPMiner proves be to very useful and feasible in fatigue reliability theory.

  11. The solubility of a metallic mineral with other coexisting minerals and the ore-forming processes of metallic sulfides

    Institute of Scientific and Technical Information of China (English)

    CEN; Kuang; (岑况); YU; Chongwen; (於崇文)

    2001-01-01

    Most metallic minerals in ore deposits are sulfides. When a sulfide mineral coexists with rock-forming minerals, its solubility is distinctly different from itself alone. The change in dissolution character of a mineral with coexisting rock-forming minerals leads to particular geochemical be-havior. The concept of solubility of a metallic mineral with coexisting rock-forming minerals and its theory and model of calculation are put forward. Taking Tianmashan Cu-Au ore deposit of sulfide minerals in Tongling district as an example, solubilities of some metallic minerals with other coex-isting minerals, such as pyrite or chalcopyrite with quartz (representing sandstone) or calcite (rep-resenting limestone), are calculated. The results show the mechanism of ore-forming processes. As the ore-forming fluid flows through sandstone, it dissolves pyrite in the sandstone at first, then transports the iron and sulfur to the interface between sandstone and limestone and eventually precipitates them on the interface.

  12. Predicting the Mineral Composition of Dust Aerosols

    Science.gov (United States)

    Perlwitz, J. P.; Perez, C.; Miller, R. L.; Rodriguez, S.

    2012-12-01

    Models of the soil (''mineral'') dust aerosol cycle, embedded in climate and Earth system models, are essential tools for understanding the causal relationships and feedbacks between dust and climate. Many soil dust schemes in Earth system models use a simplified representation of soil dust aerosols, where the soil dust is distinguished by size bins or size distribution modes, with a globally uniform representation of the mineralogical composition of the particles. Although models with such a simplified assumption about the properties of soil dust particles have already significantly contributed to the understanding of the role of soil dust aerosols in climate, this is a limitation for a number of reasons: 1. The response of clouds and the large-scale circulation depends on the radiative properties like the single scattering albedo, which should vary with the mineral composition of the source region; 2. Chemical processes at the surface of the soil dust particles that form sulfate and nitrate coatings depend on the dust mineral composition; 3. The availability of soil dust minerals as cloud condensation nuclei depends on their hygroscopicity, which in turn depends on the mineral composition; 4. Fertilization of phytoplankton with soluble iron, a process that influences ocean carbon uptake, depends upon mineral types. We present a new version of the soil dust scheme in the NASA GISS Earth System ModelE, which takes into account the mineral composition of the soil dust particles. Soil dust aerosols are represented as a mixture of externally and internally mixed minerals, such as Illite, Kaolinite, Smectite, Calcite, Iron(hydr)oxide, Quartz, Feldspar, and Gypsum, as well as aggregates between Iron(hydr)oxide and each of the minerals. We test two approaches to constrain the mineral composition of the soil dust particles against data from measurements published in literature as well as measurements from Izaña (Tenerife). The comparison between modeled and measured data

  13. Estudio de los fundentes utilizados en la metalurgia del cobre en Cerro Muriano (Córdoba durante el período Romano Altoimperial

    Directory of Open Access Journals (Sweden)

    Criado, A. J.

    1996-10-01

    Full Text Available There are no doubts that Hispania was, under the Roman Empire, the most profitable and abundant in resources of all the mining districts exploded by Rome -Hispania, Galia, Danubian Provinces, Dacia, Greece, Asia Minor, Syria, Egypt and North Africa-. Plinius gives the same data and hands many more in the passages dedicated to the mining and the working of the metals in his Natural History. Of all the many mining places that this author refers, the exploiting in copper at Cerro Muriano presents the main interest; of this he says that it was of an unbeatable quality, used, among other applications, to manufacture the very famous "Copper of Campania". The utilization of fusing agents, adapted to the process of copper obtainment, is fundamental for obtaining this high quality. The addition of these fusing agents was very important for the control of the work parameters and to reach the required temperatures. The high purity of the obtained copper shows a very close knowledge of the phenomena involved in the process.

    Durante el Imperio Romano, de todos los distritos mineros explotados por Roma -Hispania, Galia, las provincias danubianas, Dacia, Grecia, Asia Menor, Siria, Egipto y el Norte de África-, sin duda el más rentable y más abundante en recursos era Hispania. Plinio facilita muchos datos en los pasajes dedicados a la minería y el trabajo de los metales en su Historia Natural. Entre los muchos lugares mineros que este autor cita, nos interesa ahora la explotación de cobre en Cerro Muriano, del cual dice que era de una calidad inmejorable, utilizado, entre otras aplicaciones, para fabricar el famosísimo cobre de Campania. Para poder obtener esta elevada calidad, es fundamental la utilización de fundentes adecuados en el proceso de obtención de cobre. La adición de estos fundentes era vital para controlar los parámetros de trabajo y alcanzar las temperaturas requeridas. La elevada pureza del cobre obtenido demuestra un

  14. Eficiencia de la transferencia de elementos aleantes en fundentes durante el proceso de soldadura automática por arco sumergido

    Directory of Open Access Journals (Sweden)

    Quintana, R.

    2003-02-01

    Full Text Available It is assessed the transfer of chromium, manganese and carbon of different agglomerate fluxes constituted by 18.75 % of alloyed load and 81.25 % of matrix during the SAW process (Submerge Arc Welding. A vitreous basic matrix corresponding to the system SiO2-Al2O3-(CaO+MgO was obtained from minerals by fusion in the electric arc furnace. The current proportions of the alloyed load components (FeCr, FeMn and graphite were carried out using a McLean Anderson experiment design. The corresponding fluxes to each experimental point were obtained by granulation with liquid glass; afterwards, their transfer coefficient for a given regimen of welding was determined. The transfer coefficients were calculated by means of a formula based on the laws of mass conservation and of distribution.

    Se realizó un estudio de la transferencia de cromo, manganeso y carbono durante el proceso SAW (Submerged Arc Welding de diferentes fundentes aglomerados constituidos por 18,75 % de carga aleante y 81,25 % de matriz. En homo eléctrico de arco, mediante la fusión de mezclas de minerales, se obtuvo una matriz básica vitrea, correspondiente al sistema SiO2-Al2O3 -(CaO+MgO. La proporción en que se encuentran los componentes de la carga aleante (FeCr, FeMn y grafito se estableció a través de un diseño de experimentos del tipo McLean Anderson. Los fundentes correspondientes a cada punto experimental se obtuvieron por rodadura, utilizando vidrio líquido como aglomerante. A los fundentes obtenidos se les determinaron los coeficientes de transferencia para un régimen de soldadura invariable, utilizando para ello una expresión de cálculo basada en las leyes de conservación de masa y de reparto.

  15. Desempenho reprodutivo e metabólitos sanguíneos de ovelhas Ile de France sob suplementação com sal orgânico ou sal comum durante a estação de monta Reproductive performance and blood metabolites from Ile de France ewes fed organic or common salt in the breeding season

    Directory of Open Access Journals (Sweden)

    Luiz Antero de Oliveira Peixoto

    2010-01-01

    Full Text Available Avaliou-se o desempenho reprodutivo de ovelhas sob suplementação com sal orgânico ou sal comum durante a estação de monta e sua associação com os constituintes metabólicos do sangue. O experimento foi conduzido no período de novembro de 2005 a maio de 2006 utilizando-se 40 ovelhas da raça Ile de France. Durante a estação de monta, as ovelhas permaneceram em duas áreas de campo nativo, cada uma com 15 hectares, e foram distribuídas em dois grupos, conforme o tipo de suplementação: recebendo apenas mistura mineral (sal+fosfato ou suplementação diária de sal orgânico. Foram analisados os indicadores bioquímicos do perfil nutricional por meio da quantificação de albumina, ureia, glicose, colesterol e triglicerídeos do soro sanguíneo. As ovelhas sob suplementação com mineral orgânico tiveram teor de nitrogênio ureico sérico superior ao daquelas que receberam mineral na forma tradicional (39,00 vs 35,69 mg/dL, respectivamente. Os demais componentes bioquímicos avaliados não apresentaram diferença entre as formas de suplementação. Os níveis séricos de albumina, ureia, glicose e colesterol apresentaram variação entre os períodos avaliados durante a estação de monta. Os níveis séricos de albumina e nitrogênio ureico não influenciam a taxa de parição das ovelhas. A suplementação com mineral orgânico não melhora os índices reprodutivos do rebanho ovino na estação de monta das ovelhas.The objective of this study was to evaluate the reproductive performance of ewes supplemented with organic or common mineral salt in the breeding season, and the effect on metabolic constituents of the blood. The experiment was carried out from November 2005 to May 2006 using 40 Ile de France breed ewes. During the breeding season, sheep grazed on two native pasture areas of 15 ha each and were distributed in two groups, depending on the supplementation: submitted to treatments: receiving only mineral mix (salt

  16. Mapping the Mineral Resource Base for Mineral Carbon-Dioxide Sequestration in the Conterminous United States

    Science.gov (United States)

    Krevor, S.C.; Graves, C.R.; Van Gosen, B. S.; McCafferty, A.E.

    2009-01-01

    This database provides information on the occurrence of ultramafic rocks in the conterminous United States that are suitable for sequestering captured carbon dioxide in mineral form, also known as mineral carbon-dioxide sequestration. Mineral carbon-dioxide sequestration is a proposed greenhouse gas mitigation technology whereby carbon dioxide (CO2) is disposed of by reacting it with calcium or magnesium silicate minerals to form a solid magnesium or calcium carbonate product. The technology offers a large capacity to permanently store CO2 in an environmentally benign form via a process that takes little effort to verify or monitor after disposal. These characteristics are unique among its peers in greenhouse gas disposal technologies. The 2005 Intergovernmental Panel on Climate Change report on Carbon Dioxide Capture and Storage suggested that a major gap in mineral CO2 sequestration is locating the magnesium-silicate bedrock available to sequester the carbon dioxide. It is generally known that silicate minerals with high concentrations of magnesium are suitable for mineral carbonation. However, no assessment has been made in the United States that details their geographical distribution and extent, nor has anyone evaluated their potential for use in mineral carbonation. Researchers at Columbia University and the U.S. Geological Survey have developed a digital geologic database of ultramafic rocks in the conterminous United States. Data were compiled from varied-scale geologic maps of magnesium-silicate ultramafic rocks. The focus of our national-scale map is entirely on ultramafic rock types, which typically consist primarily of olivine- and serpentine-rich rocks. These rock types are potentially suitable as source material for mineral CO2 sequestration.

  17. Suplementação protéica energética no desempenho de novilhas em pastejo durante a fase de terminação Energetic protein supplementation on heifers performance in grazing during the finish phase

    Directory of Open Access Journals (Sweden)

    Matheus Henrique Moretti

    2011-06-01

    Full Text Available Para estudar o efeito da suplementação da dieta sobre o desempenho de novilhas na fase de terminação mantidas em pastagem de capim-marandu sob lotação intermitente, durante a estação chuvosa, foram utilizadas 20 novilhas cruzadas (¼ Nelore, ¼ Santa Gertrudes, ½ Braunvieh com peso corporal médio de 300 kg e 22 meses de idade. Os tratamentos constituíram-se de dois tipos de suplementação: sal mineral (SM ad libtum e suplemento protéico energético (SPE fornecido a 0,3% do peso corporal (PC por dia com avaliações realizadas a cada 28 dias, no período entre dezembro de 2006 e março de 2007 Foram avaliados o desempenho animal e as características de carcaça medidas por ultrassom. Observou-se o efeito (P=0,057 da suplementação sobre o ganho de peso dos animais suplementados, 0,700 kg/dia e 0,587 kg/dia dos animais que receberam sal-mineral. Houve efeito da suplementação na área de olho de lombo e profundidade do músculo Gluteus medius. As demais características analisadas pela técnica de ultrassom não diferiram entre si em função da suplementação. A suplementação protéica energética da dieta permite ganhos adicionais, o que reflete em aumento da deposição de músculo de novilhas mantidas em pastagem de capim-marandu durante o período das águas.This study was conducted to evaluate the effect of the diet supplementation on the heifers performance in finishing phase, maintained in a marandu grass pasture managed in intermittent grazing system during the rainy season. Twenty crossbreed (¼ Nelore, ¼ Santa Gertrudes, ½ Braunvieh heifers with average initial body weight of 300 kg and 22 months old were used. The treatments consisted of two types of supplements: mineral (SM ad libtum and energy protein supplementation (PES provided 0.3% of the body weight daily. The evaluated variables were: animal performance and carcass traits measured by ultrasound each 28 days. Supplementation affected daily weight gain (P=0

  18. Smoking cessation and associated factors during pregnancy Cese del consumo de tabaco durante el embarazo y factores asociados

    Directory of Open Access Journals (Sweden)

    Matías Torrent

    2004-06-01

    Full Text Available Objective: To examine smoking habits before and during pregnancy, as well as factors associated with smoking cessation, in three European settings. Methods: Women seeking antenatal care in Ashford (UK, Minorca and Barcelona (Spain were recruited to the Asthma Multicenter Infant Cohort Study (AMICS. Questionnaires inquiring into the smoking habits of each woman and her partner, demographic data, occupation, educational level, number of previous children, breast feeding, alcohol intake, and history of asthma and of other allergic diseases were completed during pregnancy and in the first year after delivery. Results: A total of 1 572 pregnant women were included in the three cohorts. Smoking prior to pregnancy was more common in Barcelona (46.2% than in Minorca (39.8% or Ashford (31.6%. Cessation rates during pregnancy also differed: 18% of women in Ashford, 20.4% in Minorca and 31.9% in Barcelona were still smoking during the first trimester. In a multivariate regression model, the factors showing a significant (negative association with smoking cessation during pregnancy were having older children, having a partner who smoked and starting smoking at a young age. Conclusions: Baseline smoking habits and changes in smoking habits during pregnancy significantly differed between the three communities studied. Women pregnant with their first child, those who had started smoking at a later age and those whose partners were non-smokers were more likely to stop smoking when pregnant.Objetivo: Describir el hábito tabáquico antes y durante el embarazo y los factores asociados con su cese con relación al embarazo en distintos entornos europeos. Métodos: Se ha incluido en el estudio a las mujeres captadas durante el embarazo para participar en el estudio AMICS (Asthma Multicentre Infant Cohort Study en Ashford (Reino Unido, Barcelona y Menorca (España. Se administró un cuestionario durante el embarazo y otro durante el primer año posparto, que inclu

  19. Expresión diferencial durante la interacción Solanum tuberosum - Phytophthora infestans

    Directory of Open Access Journals (Sweden)

    Zulma Isabel Monsalve-Fonnegra

    2013-02-01

    Full Text Available Normal 0 21 false false false ES-CO X-NONE X-NONE MicrosoftInternetExplorer4 Título en ingles: Differential expression during Solanum tuberosum- Phytophthora infestans interactionResumen: La papa (Solanum tuberosum L. es el cuarto cultivo más importante a nivel mundial y es el producto agrícola con mayor demanda de fungicidas, insecticidas y fertilizantes químicos. Las pérdidas mundiales ocasionadas por Phytophthora infestans (Mont. de Bary en este cultivo, ascienden a 6,7 billones de dólares al año y su control químico genera un aumento en los costos, perjudica la salud humana y el ambiente. Todo esto justifica la búsqueda constante de mecanismos alternativos para el control de la enfermedad, entre ellos la obtención de variedades resistentes mediante cisgenesis usando genotipos silvestres. Como un aporte en este sentido, y dada la falta de conocimiento de lo que controla y constituye la diferencia entre una respuesta compatible e incompatible, en el presente estudio se compararon los perfiles de expresión génica obtenidos mediante Despliegue Diferencial de variedades resistentes y susceptibles durante su interacción con P. infestans. Los resultados evidenciaron diferencias en la expresión génica, tanto a distintos tiempos post-inoculación como en el tipo de cambio de expresión, incluyendo la presencia y ausencia de bandas diferenciales y el aumento o disminución en su intensidad. Al analizar las secuencias de fragmentos diferencialmente expresados, se encontró que algunos fragmentos sobre-expresados en las variedades susceptibles, tenían homología con secuencias que codifican para una serina-acetiltranferasa y para la subunidad β de la RNA polimerasa. Por su parte, fragmentos sobre-expresados en la variedad resistente, tenían homología con una secuencia codificante para un dominio transmembranal. Palabras claves: pastusa suprema;  diacol-capiro; parda pastusa; despliegue diferencial Abstract: Potato (Solanum tuberosum

  20. Parada cardíaca inesperada durante colecistectomia: relato de caso

    Directory of Open Access Journals (Sweden)

    Croitor Lorena Brito da Justa

    2002-01-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A parada cardíaca per-operatória é um evento grave, e sua incidência em nosso serviço é de 31:10.000 anestesias. O objetivo deste relato é apresentar um caso de parada cardíaca durante anestesia geral em uma paciente submetida a colecistectomia. RELATO DO CASO: Paciente feminina, 16 anos, 62 kg, estado físico ASA I, submetida à colecistectomia por via aberta. Midazolam (15 mg por via oral foi a medicação pré-anestésica. Foi realizadas indução anestésica com sufentanil (50 µg, propofol (150 mg e atracúrio (30 mg. A anestesia foi mantida com isoflurano e N2O. Após trinta minutos de cirurgia ocorreu bradicardia sinusal revertida com atropina (0,5 mg. Vinte minutos depois, ocorreu outra bradicardia com bloqueio átrio-ventricular de 3º grau evoluindo rapidamente para parada cardíaca (PCR em assistolia, apesar da administração de atropina (1 mg. As manobras de reanimação foram iniciadas imediatamente, juntamente com a administração de adrenalina (1 mg, com retorno dos batimentos cardíacos espontâneos após aproximadamente cinco minutos da PCR. A cirurgia foi concluída e a paciente manteve-se estável hemodinami- camente. A paciente foi extubada duas horas após o término da cirurgia apresentando-se sonolenta, não contactante, com bom padrão ventilatório e hemodinâmico. Após doze horas de observação na unidade de terapia intensiva (UTI a paciente apresentava-se agitada e desconexa. Vinte e quatro horas após a PCR a paciente recebeu alta da UTI consciente, orientada, sem queixas e sem déficit neurológico. Recebeu alta hospitalar no 4º dia do pós-operatório. CONCLUSÕES: Diversos fatores podem contribuir para a ocorrência de disritmias e parada cardíaca no per-operatório, destacando-se a estimulação vagal secundária às manobras cirúrgicas. O diagnóstico precoce e o rápido início das manobras de reanimação são de fundamental importância para a boa evolução neurol

  1. Consumo de antioxidantes durante tratamento quimioterápico Antioxidants consumption during chemotherapy treatment

    Directory of Open Access Journals (Sweden)

    Caroline Cavali Rohenkohl

    2011-06-01

    Full Text Available RACIONAL: O câncer é definido como enfermidade multicausal crônica, em que as células possuem crescimento descontrolado. Resulta de vários fatores, sendo um dos principais, a dieta inadequada. As fases de iniciação, promoção e progressão de carcinogênese têm sido frequentemente relacionadas ao estresse oxidativo. OBJETIVO: Verificar o consumo de antioxidantes em pacientes com câncer durante os diferentes ciclos de quimioterapia. MÉTODOS: Estudo descritivo exploratório, incluindo pacientes em tratamento quimioterápico em ambulatório de quimioterapia. Para investigar o consumo de antioxidantes foi elaborado um questionário de frequência alimentar semi-quantitativo (QFASQ e uma ficha de anamnese clinica - nutricional. RESULTADOS: Amostra foi composta por 30 pacientes com idade média de 56,4±2,3 anos. De acordo com o consumo diário representado pelos ciclos, houve adequado consumo de vitamina C, vitamina E e Zinco e inadequado consumo de vitamina A e Selênio. Ao dividir a tabela estudada segundo os quatro quartis de consumo diário de antioxidantes, houve consumo adequado de vitamina A em 25% da amostra e inadequado de vitamina C, vitamina E, zinco em 25% da amostra e de também selênio em todos os ciclos. Entre as fontes alimentares consideradas ricas nos antioxidantes estudados, as mais consumidas foram cenoura, espinafre, mamão, laranja, óleo de soja, óleo de girassol, carne vermelha, queijo e carne de frango. CONCLUSÃO: A população estudada atingiu o consumo diário recomendado para os antioxidantes analisados quando dividida nos ciclos do tratamento, mas houve porcentagem alta de consumo inadequado quando dividida nos quartis. Desta forma, a orientação nutricional é um fator indispensável para auxiliar na prevenção e controle do câncer.BACKGROUND: The cancer is defined as chronic multifactorial disease, in which cells have uncontrolled growth. Several factors contribute to its development, one of them is

  2. COMPARTIMENTACIÓN INTRACELULAR DEL ACETATO EN ASTROCITOS DURANTE LA PRELACTANCIA

    Directory of Open Access Journals (Sweden)

    A. Salazar-Amado

    2005-12-01

    Full Text Available El gasto energético es tan grande en el momento del nacimiento, que las neuronas no podrían sobrevivir sin el soporte metabólico de los astrocitos. Adicionalmente, la necesidad de neurotransmisores es tan alta en la prelactancia, que sin la colaboración metabólica de los astrocitos sería imposible mantener los niveles de intermediarios del ciclo de los ácidos tricarboxílicos para mantener su síntesis.Este trabajo se enfocó en el estudio de los procesos metabólicos intracelulares de los astrocitos donde está involucrado el acetato para establecer su importancia en el metabolismo oxidativo y lipogénico durante la prelactancia. Se incubaron cultivos quiescentes de astrocitos neonatales de rata con acetato (5 mM, [1-14C]-acetato, [2-14C]-acetato y [U-14C]-acetato (1 µ Ci (200-300 dpm/nmol. Adicionalmente, se utilizaron inhibidores enzimáticos como el dicloroacetato (1 mM y el aminooxiacetato (5 mM, e inhibidores del transporte como el α-ciano-4-hidroxicinnamato (2 mM, butilmalonato (5 mM y 1,2,3-bencenotricarboxílato (5 mM. Los resultados en su conjunto indican que los astrocitos pueden metabolizar acetato más como sustrato energético que lipogénico, lo que nos permite pensar que este sustrato puede llegar a ser más importante para ayudar a mantener el metabolismo oxidativo, favoreciendo el reciclaje de carbonos en la prelactancia. Adicionalmente, se evidenció con el uso de [1-14C]-acetato una alta actividad anaplerótica sobre todo cuando los astrocitos requieren mantener los reservorios de oxalacetato y acetil-CoA para mantener la respiración. Estos resultados señalan a la acetil-CoA sintetasa mitocondrial (AceCS2, la piruvato carboxilasa (PC y la enzima málica citosólica (cME, como enzimas claves para mantener el funcionamiento de los astrocitos en la prelactancia. Con el uso de [2-14C]-acetato, los resultados sugieren que los astrocitos in vitro tienen un alto requerimiento de carbonos, principalmente para la s

  3. Sepse durante a gestação: relato de caso Sepsis during pregnancy: case report

    Directory of Open Access Journals (Sweden)

    Renato Laks

    2007-06-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: A sepse durante a gestação é uma complicação rara. O comprometimento fetal resulta principalmente da descompensação materna, por conseguinte, o tratamento deve ser direcionado ao bem-estar da mãe. Poucas evidências permitem extrapolar o tratamento de pacientes não gestantes para as gestantes, porém, o tratamento baseado no Surviving Sepsis Campaing parece adequado e prático. O objetivo deste estudo foi rever o tratamento da sepse na gestação e relatar um caso de gestante com sepse grave que evoluiu favoravelmente. RELATO DO CASO: Paciente com 22 anos, primigesta, na 27ª semana de gestação foi internada com diagnóstico de pielonefrite aguda. Um dia após a internação apresentou quadro de sepse, com hipoxemia refratária às medidas não-invasivas necessitando de intubação traqueal. Após a intubação evoluiu com hipotensão refratária à expansão volêmica necessitando de fármaco vasoativo. Foi interrompido o uso de noradrenalina no mesmo dia e prescrito cefepima. Evoluiu com importante melhora dos padrões ventilatórios, sendo extubada e recebeu alta hospitalar logo após completar o tratamento com antibiótico. Ao completar a 42ª semana de gestação foi internada para indução do trabalho de parto, sendo realizado parto vaginal, sem intercorrências. CONCLUSÕES: A sepse na gestação, mesmo sendo rara é potencialmente fatal. O tratamento foi baseado no Surviving Sepsis Campaign e a paciente apresentou melhora significativa dos parâmetros de perfusão nas primeiras horas com ótima evolução, apesar da gravidade da doença.BACKGROUND AND OBJECTIVES: Sepsis during pregnancy is a rare complication. This potentially fatal disease often occurs due to maternal infectious and can lead to fetal loss. Therefore, any attempted treatment must be aimed at the mother’s well being. As a matter of fact, there are few recent medical publications about sepsis in pregnancy. In spite of this, the

  4. Raman spectra of human dentin mineral

    NARCIS (Netherlands)

    Tsuda, H; Ruben, J; Arends, J

    1996-01-01

    Human dentin mineral has been investigated by using micro-Raman spectroscopy. Fluorescence and thermal problems were largely avoided by preparing dentin samples by grinding and ultrasonic agitation in acetone. The Raman spectral features were consistent with those of impure hydroxyapatite containing

  5. Explosion of Ultrahigh Pressure Minerals in Mantle

    Institute of Scientific and Technical Information of China (English)

    BAI Wenji; YANG Jingsui; FANG Qingsong; YAN Binggang; ZHANG Zhongming

    2001-01-01

    @@ The microexplosion stucture of ultrahigh pressure minerals was found for the first time in podform chromitites within the mantle peridotite facies of Luobusa ophiolite along the Yarlung Zangbo suture zone.The explosion stuctures of high-energy silicate inclusions are commonly seen in thin sections (see figure).

  6. Computer programmes for mineral processing presentation

    OpenAIRE

    Krstev, Aleksandar; Krstev, Boris; Golomeov, Blagoj; Golomeova, Mirjana

    2009-01-01

    In this paper will be shown computer application of softwares Minteh-5, Minteh-6 and Cyclone in Visual Basic, Visual Studio for presentation of two-products for some closed circuits od grinding-clasifying processes. These methods make possibilities for appropriate, fast and sure presentation of some complex circuits in the mineral processing technologies.

  7. Biaxial phases in mineral liquid crystals

    NARCIS (Netherlands)

    Vroege, G.J.

    2013-01-01

    A review is given of liquid crystals formed in colloidal dispersions, in particular those consisting of mineral particles. Starting with the historical development and early theory, the characteristic properties related to the colloidal nature of this type of liquid crystals are discussed. The possi

  8. Heavy minerals : from 'Edelstein' to Einstein

    NARCIS (Netherlands)

    de Meijer, RJ

    1998-01-01

    Identification in 1982 on the Dutch Frisian Island of Ameland of beach sand with;ln enhanced level of natural radioactivity, due to concentrations of heavy minerals, inspired a multi-disciplinary research project. A joint research effort in geochemistry, sedimentology, hydrodynamics, solid-state phy

  9. Mineral resource of the month: mercury

    Science.gov (United States)

    ,

    2012-01-01

    The article offers information on mercury, a mineral commodity used in industrial and small-scale gold mining applications. Mercury has been reported to be used for amalgamation with gold since the Roman times. Mercury from cinnabar from Almadén, Spain has been used by Romans and has been continued to be used through the Middle Ages and the Colonial era.

  10. Yarlongite:A New Metallic Carbide Mineral

    Institute of Scientific and Technical Information of China (English)

    SHI Nicheng; BAI Wenji; LI Guowu; XIONG Ming; FANG Qingsong; YANG Jingsui; MA Zhesheng; RONG He

    2009-01-01

    Yarlongite occurs in ophiolitic chromitite at the Luobusha mine(29°5'N 92°,5'E,about 200 km ESE of Lhasa),Qusum County,Shannan Prefecture,Tibet Autonomous Region,People'S Republic of China.Associated minerals are:diamond,moissanite,wiistite,iridium("osmiridium"), osmium("iridosmine"),periclase,chromite,native irun,native nickel,native chromium,forsterite. Cr-rich diopside,intermetallic compounds Ni-Fe-Cr,Ni-Cr,Cr-C,etc.Yariongite and its associated minerals were handpicked from a large heavy mineral sample of chromitite.The metallic carbides associated with yarlongite are cohenite,tongbaite,khamrabaevite and qusongite(IMA2007.034). Yarlongite occurs as irregular grains,with a size between 0.02 and 0.06 mm,steel-grey colour,H Mohs:5 1/2-6.Tenacity:brittle.Cleavage:{0 0 1}perfect.Fracture:conchoidal.Chemical formula: (Cr4Fe4Ni)∑9C4,or(Cr,Fe,Ni)∑9C4,Crystal system:Hexagonal,Space Group:P63/mc,a=18.839(2)A,C =4.4960(9)A,V=745.7(2)A3,Z=6,Density(calc.)=7.19 g/cm3(with simplified formula).Yarlongite has been approved as a new mineral by the CNMNC(IMA2007-035).Holotype material is deposited at the Geological Museum of China(No.M11650).

  11. New Mexico Known Mineral Deposit Areas

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — This dataset contains all Known Mineral Deposit Areas in the state of New Mexico. It is in a vector digital structure digitized from a 1:500,000 scale map of the...

  12. Rare earth elements and strategic mineral policy

    NARCIS (Netherlands)

    Kooroshy, J.; Korteweg, R.; Ridder, M. de

    2010-01-01

    Newspapers report almost daily on international tensions around ‘strategic’ or ‘critical’ minerals such as rare earth elements. The temporary freeze of rare earth exports from China to Japan in late 2010 in retaliation of the capture of a Chinese captain is but one example of the strategic use of no

  13. New Mexico Minerals Industry Locator System (MILS)

    Data.gov (United States)

    Earth Data Analysis Center, University of New Mexico — This contains all Mineral Industry Systems in the state of New Mexico. It is in a vector digital structure digitized from a 1:500,000 scale map of the state of New...

  14. Organic matter mineralization in marine systems

    NARCIS (Netherlands)

    Middelburg, J.J.; Vlug, T.; Van der Nat, F.J.

    1993-01-01

    Many of the reactions and biogeochemical processes that occur in the marine environment are related directly or indirectly to the mineralization of organic matter. Decomposition of organic matter is responsible for the recycling of essential nutrients, for the oxygen balance of the ocean and its sed

  15. Lidar Methods for Observing Mineral Dust

    Institute of Scientific and Technical Information of China (English)

    Nobuo SUGIMOTO; HUANG Zhongwei

    2014-01-01

    Lidar methods for observing mineral dust aerosols are reviewed. These methods include Mie scattering lidars, polarization lidars, Raman scattering lidars, high-spectral-resolution lidars, and fluorescence lidars. Some of the lidar systems developed by the authors and the results of the observations and applications are introduced. The largest advantage of the lidar methods is that they can observe vertical distribution of aerosols continuously with high temporal and spatial resolutions. Networks of ground-based lidars provide useful data for understanding the distribution and movement of mineral dust and other aerosols. The lidar network data are actually used for validation and assimilation of dust transport models, which can evaluate emission, transport, and deposition of mineral dust. The lidar methods are also useful for measuring the optical characteristics of aerosols that are essential to assess the radiative effects of aerosols. Evolution of the lidar data analysis methods for aerosol characterization is also reviewed. Observations from space and ground-based networks are two important approaches with the lidar methods in the studies of the effects of mineral dust and other aerosols on climate and the environment. Directions of the researches with lidar methods in the near future are discussed.

  16. Mineral resource of the month: magnesium

    Science.gov (United States)

    Kramer, Deborah A.

    2012-01-01

    Magnesium is the eighthmost abundant element in Earth’s crust, and the second-most abundant metal ion in seawater. Although magnesium is found in more than 60 minerals, only brucite, dolomite, magnesite and carnallite are commercially important for their magnesium content. Magnesium and its compounds also are recovered from seawater, brines found in lakes and wells, and bitterns (salts).

  17. Measurement and Modelling of Scaling Minerals

    DEFF Research Database (Denmark)

    Villafafila Garcia, Ada

    2005-01-01

    of scale formation found in many industrial processes, and especially in oilfield and geothermal operations. We want to contribute to the study of this problem by releasing a simple and accurate thermodynamic model capable of calculating the behaviour of scaling minerals, covering a wide range...

  18. Phalangeal bone mineral density predicts incident fractures

    DEFF Research Database (Denmark)

    Friis-Holmberg, Teresa; Brixen, Kim; Rubin, Katrine Hass;

    2012-01-01

    This prospective study investigates the use of phalangeal bone mineral density (BMD) in predicting fractures in a cohort (15,542) who underwent a BMD scan. In both women and men, a decrease in BMD was associated with an increased risk of fracture when adjusted for age and prevalent fractures...

  19. Mineral resources of Colombia (other than petroleum)

    Science.gov (United States)

    Singewald, Quentin Dreyer

    1950-01-01

    The following report summarizes data acquired during 1942-45, in Colombia, by geologists and engineers of the Foreign Economic Administration, with whom the United States Geological Survey cooperated. Twenty-nine mineral commodities are considered, but the data for five of them are scant because they were of no interest to FEA personnel. Petroleum is not considered. Preliminary to a review of individual mineral commodities, resumes are given of the general geography and geology of Colombia and of the country's mining laws. The principal mineral commodities, besides petroleum, produced in Colombia are (1) emeralds, gold, platinum, and silver, mainly for export, and (2) barite, cement, clay, coal, gypsum, salt, sand and gravel, silica, and stone, mainly for the domestic market. A large number of other mineral commodities are known in "raw" prospects, some of which may eventually become productive. Their distribution and apparent potentialities, as of 1945, are given. Factors unfavorable to mining are the ruggedness of the terrain, the scarcity of outcrops, and the very high transportation costs.

  20. Reserve evaluation of minerals at NUCLEBRAS

    International Nuclear Information System (INIS)

    The method used for the reserve evaluation of minerals, particularly of uranium, as used worldwide, and specially at NUCLEBRAS is described. This is done through a series of procedures envolving basic definitions, reserve evaluation methods (conventional, statistical and geoestatistical), data management, use of computer systems, classification and evaluation of reserves. (Author)

  1. Iron oxyhydroxide mineralization on microbial extracellular polysaccharides

    Energy Technology Data Exchange (ETDEWEB)

    Chan, Clara S.; Fakra, Sirine C.; Edwards, David C.; Emerson, David; Banfield, Jillian F.

    2010-06-22

    Iron biominerals can form in neutral pH microaerophilic environments where microbes both catalyze iron oxidation and create polymers that localize mineral precipitation. In order to classify the microbial polymers that influence FeOOH mineralogy, we studied the organic and mineral components of biominerals using scanning transmission X-ray microscopy (STXM), micro X-ray fluorescence ({mu}XRF) microscopy, and high-resolution transmission electron microscopy (HRTEM). We focused on iron microbial mat samples from a creek and abandoned mine; these samples are dominated by iron oxyhydroxide-coated structures with sheath, stalk, and filament morphologies. In addition, we characterized the mineralized products of an iron-oxidizing, stalk-forming bacterial culture isolated from the mine. In both natural and cultured samples, microbial polymers were found to be acidic polysaccharides with carboxyl functional groups, strongly spatially correlated with iron oxyhydroxide distribution patterns. Organic fibrils collect FeOOH and control its recrystallization, in some cases resulting in oriented crystals with high aspect ratios. The impact of polymers is particularly pronounced as the materials age. Synthesis experiments designed to mimic the biomineralization processes show that the polysaccharide carboxyl groups bind dissolved iron strongly but release it as mineralization proceeds. Our results suggest that carboxyl groups of acidic polysaccharides are produced by different microorganisms to create a wide range of iron oxyhydroxide biomineral structures. The intimate and potentially long-term association controls the crystal growth, phase, and reactivity of iron oxyhydroxide nanoparticles in natural systems.

  2. Registry of Mineral and Petroleum Titles

    Energy Technology Data Exchange (ETDEWEB)

    Maclellan, I. M.; Kaizer, J. L.; McCulloch, P. D.; Ratcliffe, R.; Wenning, A. S. [Nova Scotia Dept. of Natural Resources, Halifax, NS (Canada)

    2000-07-01

    Activities of the Nova Scotia Registry of Mineral and Petroleum Titles are described, including statistical information about staking and mining activity in the province during 1999. In terms of activities, the Registry receives applications and issues licenses and leases for mineral and petroleum rights, receives statements of exploration expenditures and assessment reports that pertain to renewal of licenses and leases, maintains maps showing the disposition of lands under license or lease, and maintains a system of prospector registration. In addition, the Registry processes applications for underground gas storage rights and treasure trove rights and maintains a database of information concerning production and employment in Nova Scotia mines and quarries. At the end 1999 there were 230,660 hectares under exploration licence. Exploration expenditures, including engineering, economic and feasibility studies during 1999 totalled $4.2 million, mostly by junior mining companies searching for industrial mineral commodities. Mining activity during 1999 generated revenues of $340 million. Coal production dropped by 25 per cent, due mainly to the closure of the Phalen Mine. Gypsum production was up to 7.9 million tonnes; shipments of cement, barite and clay products also increased during 1999; salt production remained unchanged from 1998 with 842,000 tonnes. Production of construction aggregates totalled 10.6 million tonnes, down slightly from the year before. Mineral industry employment was roughly 2,500 persons, down by 24 per cent from 1998 levels, due primarily to the closure of the Phalen Mine.

  3. Oxydesulphurization of coal using trona mineral

    Energy Technology Data Exchange (ETDEWEB)

    Yaman, S.; Kuecuekbayrak, S. [Istanbul Technical Univ. (Turkey)

    1995-12-31

    In this study, the desulphurization of coal by oxydesulphunzation method using raw trona mineral was investigated. The experiments were carried out on a Turkish lignite sample which has both high pyritic and high organic sulphur contents. Some experimental parameters such as temperature, partial pressure of oxygen, concentration and time were investigated.

  4. Carbon dioxide sequestration by mineral carbonation

    NARCIS (Netherlands)

    Huijgen, W.J.J.

    2007-01-01

    The increasing atmospheric carbon dioxide (CO2) concentration, mainly caused by fossil fuel combustion, has lead to concerns about global warming. A possible technology that can contribute to the reduction of carbon dioxide emissions is CO2 sequestration by mineral carbonation. The basic concept beh

  5. Clinker mineral hydration at reduced relative humidities

    DEFF Research Database (Denmark)

    Jensen, Ole Mejlhede

    1998-01-01

    This report deals with gas phase hydration of pure cement clinker minerals at reduced relative humidities. This is an important subject in relation to modern high performance concrete which may self-desiccate during hydration. In addition the subject has relevance to storage stability where...

  6. Flotation of aluminosilicate minerals using alkylguanidine collectors

    Institute of Scientific and Technical Information of China (English)

    GUAN Feng; ZHONG Hong; LIU Guang-yi; ZHAO Sheng-gui; XIA Liu-yin

    2009-01-01

    The flotation mechanism of aluminosilicate minerals using alkylguanidine collectors was studied through flotation experiments, Zeta potential measurements and FT-IR spectrum analysis. It is shown that kaolinite, illite and pyrophyllite all exhibit good floatability with alkylguanidines as collectors at pH 4-12. The flotation recoveries rise with the increase of the carbon chain length. Isoelectric point(IEP) is determined to be 3.5, 3.0 and 2.3 for kaolinite, illite and pyrophyllite, respectively. However, it is anomalous that the presence of cationic collectors has less influence on the negatively charged mineral surfaces. It is explained by the special structure of guanidine which is one of the strongest bases, having two -NH2 groups. One of them maybe interacts with minerals by electrostatic forces, and the other maybe forms hydrogen bonding with OH- ions on the aluminosilicate surfaces or in the aqueous solution, increasing the density of negative charge on the aluminosilicate surface and leading unpronounced positive charge to increase on the aluminosilicate. By combining the flotation tests, Zeta potential and FTIR measurements above, the interaction mechanism can be concluded. The simultaneous presence of cationic and neutral amine groups makes it possible for SAG cation to bind on three aluminosilicate minerals by both electrostatic attraction and hydrogen bonding. While in acidic medium, the interaction of the alkylguanidines on the aluminosilicate surfaces is mainly by means of electrostatic force and hydrogen bond; in the alkaline medium, it is by the way of electrostatic effect and hydrogen bond.

  7. Mineral potential mapping with mathematical geological models

    NARCIS (Netherlands)

    Porwal, A.K.

    2006-01-01

    Mathematical geological models are being increasingly used by natural resources delineation and planning agencies for mapping areas of mineral potential in order to optimize land use in accordance with socio-economic needs of the society. However, a key problem in spatial-mathematical-model-based mi

  8. Recycling Ni from Contaminated and Mineralized Soils.

    Science.gov (United States)

    Rare plant species accumulate potentially valuable concentrations of some metals. Alyssum murale readily accumulates over 2% Ni in aboveground dry matter when grown on Ni-mineralized serpentine soils in Oregon, allowing production of “hay” biomass with at least 400 kg Ni ha-1 with low levels of fer...

  9. Minerals in the foods eaten by mountain gorillas (Gorilla beringei).

    Science.gov (United States)

    Cancelliere, Emma C; DeAngelis, Nicole; Nkurunungi, John Bosco; Raubenheimer, David; Rothman, Jessica M

    2014-01-01

    Minerals are critical to an individual's health and fitness, and yet little is known about mineral nutrition and requirements in free-ranging primates. We estimated the mineral content of foods consumed by mountain gorillas (Gorilla beringei beringei) in the Bwindi Impenetrable National Park, Uganda. Mountain gorillas acquire the majority of their minerals from herbaceous leaves, which constitute the bulk of their diet. However, less commonly eaten foods were sometimes found to be higher in specific minerals, suggesting their potential importance. A principal component analysis demonstrated little correlation among minerals in food items, which further suggests that mountain gorillas might increase dietary diversity to obtain a full complement of minerals in their diet. Future work is needed to examine the bioavailability of minerals to mountain gorillas in order to better understand their intake in relation to estimated needs and the consequences of suboptimal mineral balance in gorilla foods.

  10. Minerals in the foods eaten by mountain gorillas (Gorilla beringei.

    Directory of Open Access Journals (Sweden)

    Emma C Cancelliere

    Full Text Available Minerals are critical to an individual's health and fitness, and yet little is known about mineral nutrition and requirements in free-ranging primates. We estimated the mineral content of foods consumed by mountain gorillas (Gorilla beringei beringei in the Bwindi Impenetrable National Park, Uganda. Mountain gorillas acquire the majority of their minerals from herbaceous leaves, which constitute the bulk of their diet. However, less commonly eaten foods were sometimes found to be higher in specific minerals, suggesting their potential importance. A principal component analysis demonstrated little correlation among minerals in food items, which further suggests that mountain gorillas might increase dietary diversity to obtain a full complement of minerals in their diet. Future work is needed to examine the bioavailability of minerals to mountain gorillas in order to better understand their intake in relation to estimated needs and the consequences of suboptimal mineral balance in gorilla foods.

  11. Incidencia de listeriosis invasiva en la Comunidad Valenciana durante el período 2008-2010

    Directory of Open Access Journals (Sweden)

    Olalla Martínez Macias

    2012-01-01

    Full Text Available Fundamento: Listeria monocytogenes es una causa infrecuente de enfermedad, aunque en ciertos grupos (neonatos, ancianos, gestantes e inmunodeprimidos, puede ser causa de meningoencefalitis y bacteriemia. El objetivo del trabajo fue conocer la incidencia de listeriosis invasivas en la Comunidad Valenciana durante el periodo 2008-2010. Métodos: Se realizó un estudio de las listeriosis invasivas detectadas en el periodo 2008-2010. Se consideró "caso" cuando se aisló Listeria a partir de una localización anatómica potencialmente estéril. Como fuente de información se utilizaron los datos procedentes de la Red de Vigilancia Microbiológica Valenciana (RedMIVA. Resultados: Durante el período estudiado se detectaron 98 casos de listeriosis invasivas .Las tasas de incidencia fueron: 0,73 casos/100.000 habitantes en 2008, 0,70 casos/100.000 habitantes en 2009 y 0,58 casos/100.000 habitantes en 2010. El 58% se dieron en varones. El grupo etario con mayor número de casos fue el de 60-80 años (63%. En 57 (58% casos la infección se presentó en forma de bacteriemia y en 30 (31% afectó al sistema nervioso central. En el resto de los casos 11 (11% las infecciones se diagnosticaron en otros órganos. En 90 cepas (92% de los casos pudo realizarse antibiograma y todas fueron sensibles a ampicilina. Conclusiones: La tasa media de listeriosis invasiva en la Comunidad Valenciana en el periodo 2008 a 2010 ha sido de 0,67 casos/100.000 habitantes. No se han detectado agrupaciones temporales o geográficas de casos durante este periodo de tiempo.

  12. Mineral metabolism in isolated mouse long bones: Opposite effects of microgravity on mineralization and resorption

    Science.gov (United States)

    Veldhuijzen, Jean Paul; Vanloon, Jack J. W. A.

    1994-01-01

    An experiment using isolated skeletal tissues under microgravity, is reported. Fetal mouse long bones (metatarsals) were cultured for 4 days in the Biorack facility of Spacelab during the IML-1 (International Microgravity Laboratory) mission of the Space Shuttle. Overall growth was not affected, however glucose consumption was significantly reduced under microgravity. Mineralization of the diaphysis was also strongly reduced under microgravity as compared to the on-board 1 g group. In contrast, mineral resorption by osteoclasts was signficantly increased. These results indicate that these fetal mouse long bones are a sensitive and useful model to further study the cellular mechanisms involved in the changed mineral metabolism of skeletal tissues under microgravity.

  13. Minerals from Macedonia IV.Discrimination between some carbonate minerals by FTIR spectroscopy

    OpenAIRE

    Jovanovski, Gligor; Stefov, Viktor; Shoptrajanov, Bojan; Boev, Blazo

    2002-01-01

    The use of FTIR spectroscopy to distinguish between some geologically im­portant carbonate minerals (calcite - CaCO3), aragonite - CaCO3, siderite - FeCO3, magnesite - MgCO3, and dolomite - CaMg(CO3)2 originating from Macedonia and to detect mineral impurities in them is considered. 1t was shown that the series of the studied isomorphous calcite type minerals is an ideal test case for the evaluating the in­fluence of the corresponding cation upon the band frequencies or the carbonate ...

  14. Organo-mineral interactions in Pseudomonas putida-birnessite assemblages: Impact on mineral reactivity

    Science.gov (United States)

    Simanova, Anna; Kroll, Alexandra; Pena, Jasquelin

    2016-04-01

    The ability of microorganisms to precipitate biogenic birnessite nanoparticles is widely spread in the bacterial and fungal trees of life, with this process accounting largely for the formation of birnessite in nature. Birnessite minerals occur typically as nanoparticles that exhibit significant chemical and structural disorder. Furthermore, the mineral is embedded within a biomass matrix composed of microbial cells and extracellular polymeric substances, where the biomass not only provides reactive surfaces but can mediate electron transfer reactions. The overarching question guiding our research is: How do nanoscale properties and admixing with microbial biomass modify the reactivity of Mn oxide minerals? In this study, we investigate the biomass-birnessite composites of Pseudomonas putida GB-1 biomass and δ-MnO2 nanoparticles. We characterized the structure and composition of the mineral fraction using X-ray diffraction, Mn K-edge X-ray absorption spectroscopy and wet-chemical methods. To characterize the biomass fraction, we employed FTIR spectroscopy and size-exclusion chromatography analysis of the extracellular polymeric substances. Finally, we measured Ni(II) sorption isotherms at pH 6 and Ni K-edge EXAFS spectra to determine the extent and mechanism of Ni sorption in the biomass-mineral composites and in biomass-only and mineral-only systems. This approach provided direct and indirect evidence for the extent of organo-mineral interactions in the composites, as well as a direct measure of sorption reactivity in the composites relative to biomass-only and mineral-only systems. We found that admixing of mineral nanoparticles with biomass reduced the reactivity of the edge sites of birnessite particles towards Ni(II) through the attachment of organic moieties to the mineral particles and/or modification of the assemblage surface charge properties. In addition, the interaction of biomass components with MnO2 particles leads to partial Mn(IV) reduction and

  15. Information system of mineral deposits in Slovenia

    Science.gov (United States)

    Hribernik, K.; Rokavec, D.; Šinigioj, J.; Šolar, S.

    2010-03-01

    At the Geologic Survey of Slovenia the need for complex overview and control of the deposits of available non-metallic mineral raw materials and of their exploitations became urgent. In the framework of the Geologic Information System we established the Database of non-metallic mineral deposits comprising all important data of deposits and concessionars. Relational database is built with program package MS Access, but in year 2008 we plan to transfer it on SQL server. In the evidence there is 272 deposits and 200 concessionars. The mineral resources information system of Slovenia, which was started back in 2002, consists of two integrated parts, mentioned relational database of mineral deposits, which relates information in tabular way so that rules of relational algebra can be applied, and geographic information system (GIS), which relates spatial information of deposits. . The complex relationships between objects and the concepts of normalized data structures, lead to the practical informative and useful data model, transparent to the user and to better decision-making by allowing future scenarios to be developed and inspected. Computerized storage, and display system is as already said, developed and managed under the support of Geological Survey of Slovenia, which conducts research on the occurrence, quality, quantity, and availability of mineral resources in order to help the Nation make informed decisions using earth-science information. Information about deposit is stored in records in approximately hundred data fields. A numeric record number uniquely identifies each site. The data fields are grouped under principal categories. Each record comprise elementary data of deposit (name, type, location, prospect, rock), administrative data (concessionar, number of decree in official paper, object of decree, number of contract and its duration) and data of mineral resource produced amount and size of exploration area). The data can also be searched, sorted and

  16. Evolution of uranium and thorium minerals

    Science.gov (United States)

    Hazen, R. M.; Ewing, R. C.; Sverjensky, D. A.

    2009-12-01

    The origins and near-surface distributions of the approximately 250 known uranium and/or thorium minerals elucidate principles of mineral evolution. This history can be divided into four phases. The first, from ~4.5 to 3.5 Ga, involved successive concentrations of uranium and thorium from their initial uniform trace distribution into magmatic-related fluids from which the first U4+ and Th4+ minerals, uraninite (UO2), thorianite (ThO2) and coffinite (USiO4), precipitated in the crust. The second period, from ~3.5 to 2.2 Ga, saw the formation of large low-grade concentrations of detrital uraninite (containing several weight percent Th) in the Witwatersrand-type quartz-pebble conglomerates deposited in a highly anoxic fluvial environment. Abiotic alteration of uraninite and coffinite, including radiolysis and auto-oxidation caused by radioactive decay and the formation of helium from alpha particles, may have resulted in the formation of a limited suite of uranyl oxide-hydroxides. Earth’s third phase of uranium mineral evolution, during which most known U minerals first precipitated from reactions of soluble uranyl (U6+O2)2+ complexes, followed the Great Oxidation Event (GOE) at ~2.2 Ga and thus was mediated indirectly by biologic activity. Most uraninite deposited during this phase was low in Th and precipitated from saline and oxidizing hydrothermal solutions (100 to 300°C) transporting (UO2)2+-chloride complexes. Examples include the unconformity- and vein-type U deposits (Australia and Canada) and the unique Oklo natural nuclear reactors in Gabon. The onset of hydrothermal transport of (UO2)2+ complexes in the upper crust may reflect the availability of CaSO4-bearing evaporites after the GOE. During this phase, most uranyl minerals would have been able to form in the O2-bearing near-surface environment for the first time through weathering processes. The fourth phase of uranium mineralization began approximately 400 million years ago, as the rise of land plants

  17. Función del diafragma durante la colocación de cargas sobre el abdomen en sujetos normales

    OpenAIRE

    Sergio G. Monteiro; Fernando A. Pessolano; Adrián A. Suárez; Eduardo L. De Vito

    2012-01-01

    Los efectos de las cargas en el abdomen con el objeto de producir entrenamiento del diafragma, no han sido suficientemente evaluados. Estudiamos la función del diafragma durante la colocación de cargas sobre el abdomen y con cambios en el patrón respiratorio. Se estudiaron 6 voluntarios normales. Se obtuvo flujo en la boca, presión gástrica (Pga), presión esofágica (Pes), movimiento torácico (TX) y abdominal (AB), presión inspiratoria máxima (PImax) y presión transdiafragmática media (Pdi) y ...

  18. La lucha por el mantenimiento de un huerto de simples en la universidad de Valencia durante el siglo XVII

    Directory of Open Access Journals (Sweden)

    Felipo, Amparo

    2005-12-01

    Full Text Available This article deepens on the efforts made during the 17th century by Medicine professors and students, Pharmacist Associations as well as surgeons and magistrates from Valencia directed toward the creation and mantenaince of a garden destinated to the growing of medicinal plants from worldwide.

    Este artículo profundiza en los esfuerzos realizados durante el siglo XVII por catedráticos y estudiantes de Medicina, colegios de boticarios y cirujanos y magistrados municipales de Valencia orientados a la creación y mantenimiento de un huerto destinado al cultivo de plantas medicinales procedentes de diferentes partes del mundo.

  19. LA CNT A LA POLITICA CATALANA DURANT LA GUERRA CIVIL (1936-1939). ELS DEL VALLÈS OCCIDENTAL AJUNTAMENTS

    OpenAIRE

    Vargas Puga, Matias

    2005-01-01

    Escrita EN CATALÁN IDIOMA, Y OTRAS Cuestiones Relacionadas AMPLIA CON MI TESIS DOCTORAL REVISA DEL AÑO 2001 "ACTIVIDAD POLITICA DE LA IZQUIERDA ES DURANTE LA Libertaria COMARCA DEL LA GUERRA CIVIL OCCIDENTAL" (UNIVERSIDAD NACIONAL DE EDUCACION A DISTANCIA VALLÈS, FACULTAD DE GEOGRAFÍA E HISTORIA) (ESPAÑA) (REFERENCIAS A LA MISMA EN INTERNET: www.educacion.es/teseo/. Also available in: www.e-spacio.uned.es:8080. Also available in: www.cibernetia.com/tesis_es/HISTORIA/ HISTORIA_POR_EPOCAS / HIS...

  20. Relaciones afectivo-sexuales durante la adolescencia: un estudio sobre el comportamiento violento entre los iguales y en la pareja

    OpenAIRE

    Ortega-Rivera, Francisco Javier

    2015-01-01

    Introducción o motivación de la tesis En las últimas dos décadas estamos asistiendo a un incremento del interés científico por el estudio de las relaciones afectivo-sexuales durante la adolescencia. Los estudios psicosociales, y en especial los psicoevolutivos, han desplazado a aquellos que, con una visión más clínica de la adolescencia, infravaloraban la importancia que las relaciones sentimentales tienen para los adolescentes y para su desarrollo. Los cambios hormonales y el ...

  1. Beneficios del acompañamiento a la mujer por la matrona durante el trabajo de parto y puerperio

    OpenAIRE

    Rodríguez Gallego, Isabel; Partida Márquez, Antonio Luis; Castro Guerrero, Carmen

    2015-01-01

    Cartel presentado en la Segunda Conferencia Internacional de Comunicación en Salud, celebrada el 23 de octubre de 2015 en la Universidad Carlos III de Madrid Introducción: En 2008, el Ministerio de Sanidad y Consumo lanza la “Estrategia de Atención al Parto normal en el Sistema Nacional de Salud”, dónde se reconoce el derecho de la embarazada a estar acompañada por la persona que ella elija durante el embarazo, parto y puerperio. Por otro lado, ofrecer apoyo continuo profesional está descr...

  2. Relación materno fetal y establecimiento del apego durante la etapa de gestación

    OpenAIRE

    Gómez Masera, Raquel; Alonso Martín, Pilar; Rivera Pavón, Irene

    2011-01-01

    A diario vemos ejemplos de noticias por las que nos preguntamos qué pasa por la mente de una madre para llegar a tratar de una forma tan negativa a sus hijos. Es conocida la gran importancia que tiene para el desarrollo cognitivo, emocional y social durante la infancia, el establecimiento de una adecuada relación de apego madre-bebé, desde el inicio de su vida. Pero poco se ha estudiado sobre la importancia de la formación de este apego a lo largo del embarazo. Este trabajo trata ...

  3. Amargo festejo. Conflictos de identidad durante las celebraciones del Centenario argentino (Luján, provincia de Buenos Aires, 1910)

    OpenAIRE

    Marquiegui, Dedier Norberto

    2010-01-01

    International audience Durante las celebraciones del Centenario de la Revolución de Mayo de 1810, mientras la Infanta Isabel de Borbón desfilaba por las calles de la ciudad rumbo a la Basílica Nacional de Nuestra Señora de Luján, Patrona de la Argentina, y las autoridades municipales homenajeaban a los inmigrantes de las colectividades mayoritarias designando como Italia, España y Francia a las calles que pasaban frente a sus asociaciones representativas, como expresiones de un nuevo clima...

  4. Efecto de la alopregnanolona sobre la ansiedad en ratas con separación materna durante la lactancia

    OpenAIRE

    Irene Riveros-Barrera; Zulma Dueñas

    2014-01-01

    Antecedentes. La relación madre-hijo y el cuidado parental al recién nacido son fundamentales en el desarrollo fisiológico y emocional de los individuos. Evidencias asocian el estrés temprano con el desarrollo de enfermedades mentales. El modelo de separación materna durante la lactancia (SMDL) se ha utilizado para inducir estrés temprano en ratas y estudiar efectos a largo plazo. Diversos estudios han encontrado que, en ratas separadas de sus madres, disminuyen los niveles del receptor GABA-...

  5. Comportamiento de la pelvis, el centro de gravedad y la cadera de hombres y mujeres durante la marcha normal

    OpenAIRE

    Gomez Jiménez, María; López de Subijana, Cristina; Veiga Fernández, Santiago

    2015-01-01

    El objetivo del presente estudio fue analizar las diferencias entre hombres y mujeres en los movimientos de la pelvis en el plano frontal, del centro de gravedad y la de cadera durante el ciclo de la marcha. Se solicitó a 33 hombres y 29 mujeres caminar a velocidad libremente seleccionada. Se grabaron tres ciclos a cada sujeto utilizando el sistema Vicon de captura de movimiento, y 19 marcadores reflectantes colocados en puntos anatómicos. Los resultados mostraron que los hombres realizaban m...

  6. Comportamiento de la pelvis, el centro de gravedad y la cadera de hombres y mujeres durante la marcha normal

    OpenAIRE

    Gomez Jiménez, Maria; López de Subijana Hernández, Cristina; Veiga Fernandez, Santiago

    2015-01-01

    El objetivo del presente estudio fue analizar el comportamiento de la pelvis en hombres y mujeres, en el plano frontal, y relacionarlo con el movimiento del centro de gravedad y la cadera durante el ciclo de la marcha. Se solicitó a 33 hombres y 29 mujeres caminar a velocidad libremente seleccionada. Se grabaron tres ciclos a cada sujeto utilizando el sistema Vicon de captura de movimiento, y 19 marcadores reflectantes colocados en puntos anatómicos. Los resultados mostraron que los hombres r...

  7. La Educación Musical en España durante el Franquismo (1939-1975)

    OpenAIRE

    Castañón Rodríguez, María del Rosario

    2009-01-01

    Durante el franquismo la educación musical de la población escolar fue asignada tanto a los maestros y centros educativos como a las instituciones vinculadas al Movimiento (Frente de Juventudes y Sección Femenina). El análisis de los diferentes cancioneros de la época y de la revista Consigna para maestras nos permite llegar a ciertas conclusiones sobre los contenidos, métodos educativos y componentes ideológicos en la configuración del repertorio de canciones aprendidas en el período de f...

  8. Bienestar animal durante el transporte y su relación con la calidad de la carne bovina

    OpenAIRE

    Marlyn Romero P.; Jorge Sánchez V

    2015-01-01

    RESUMENEl bienestar animal (BA) es un elemento diferenciador en la comercialización de la carne bovina a nivel internacional, aunque no forma parte de los acuerdos comerciales, se pueden citar ejemplos de las experiencias de Chile, Argentina, Brasil y Uruguay con la Unión Europea, que los ha privilegiado para la exportación de carne fresca bovina con este valor agregado. Durante el transporte, cargue y descargue los bovinos son sometidos a factores estresantes que afectan su bienestar y la ca...

  9. Cambios en la formación pedagógica durante la "dictadura": orientaciones y contradicciones

    OpenAIRE

    Garatte, Luciana

    2012-01-01

    Durante la última dictadura militar y aún con anterioridad a partir de la intervención a las universidades nacionales en agosto de 1974, la formación pedagógica en la Carrera de Ciencias de la Educación y en todos los profesorados de la FAHCE/UNLP fue objeto de una serie de lineamientos de cambio institucional. En esta presentación analizamos las orientaciones formativas de esos proyectos curriculares con el propósito de establecer, por un lado, continuidades y relaciones de coherencia entre ...

  10. Cambios estructurales y funcionales en las mitocondrias durante la senescencia de hojas y raíces

    OpenAIRE

    Fanello, Diego Darío

    2016-01-01

    En las plantas, el término “senescencia” se utiliza para aludir al deterioro estructural y funcional que sufren muchos órganos en la fase terminal de su desarrollo. En particular, en las especies anuales todos los órganos vegetativos atraviesan un proceso generalizado de senescencia durante el final del desarrollo reproductivo (“senescencia monocárpica”). Se ha estudiado extensamente la senescencia de las hojas y flores, pero se ha desatendido la de otros órganos como las raíces. Como resulta...

  11. Mujeres y deporte durante el franquismo (1939-1975): Estudio piloto sobre la memoria oral de las deportistas

    OpenAIRE

    Pujadas i Martí, Xavier; Garay Ibañez de Elejalde, Beatriz; Gimeno Marco, Fernando; Llopis Goig, Ramón; Ramírez Macías, Gonzalo; Parrilla Fernández, José Manuel

    2012-01-01

    Esta investigación se centra en las mujeres deportistas del período de la dictadura franquista (1939-1975) y sus percepciones acerca de las circunstancias que rodearon a la práctica del deporte femenino en esa etapa. El objetivo principal es analizar y comparar los elementos sociales, morales, culturales, estéticos y alimentarios que intervinieron en la experiencia de las mujeres deportistas durante el franquismo, con el fin de potenciar el conocimiento sobre la situación de in...

  12. Seis claves explicativas para la política exterior argentina durante el primer mandato de Cristina F

    OpenAIRE

    Simonoff, Alejandro César

    2012-01-01

    En este trabajo nos proponemos leer la estrategia de política exterior seguida durante la primera administración de Cristina Fernández de Kirchner de acuerdo a las exigencias externas, tales como la securitización de la agenda internacional, el rol de estabilizador regional y las cuestiones referidas a la deuda externa, y una serie de cuestiones internas, como son la prioridad regional, la inserción económica internacional y la cuestión Malvinas.

  13. Composición de tallas de la captura de calamar gigante en el Golfo de California durante 1981

    OpenAIRE

    Ramírez Rodríguez, Mauricio; Klett Traulsen, Alexander

    1985-01-01

    La Pesquería de Calamar Gigante (Dosidicus gigas) en el Golfo de California tuvo un notable desarrollo durante los años de 1978 a 1980, pasando de una producción de 2,000 t en el primero a 22,400 t en el último. Ese marcado incremento estuvo íntimamente asociado con la aplicación de un mayor esfuerzo de pesca. En 1981 las capturas sufrieron un decrecimiento muy significativo, causando la crísis de la pesquería y desde 1982 el recurso dejó de presentarse en el área, terminando de esta manera s...

  14. La atención de los síntomas psicológicos durante el climaterio femenino

    OpenAIRE

    Deborah Legorreta Peyton

    2007-01-01

    El climaterio femenino es un período que se caracterizapor intensa variabilidad en las concentraciones de los estrógenos, durante la perimenopausia, o etapa de transición y descenso, marcado tanto de estos esteroides sexuales como de los andrógenos a partir de la menopausia, que explican en parte la aparición de síntomas neuropsicológicos tales como los cambios en el estado de ánimo, la capacidad de concentración y memoria, la emisión del lenguaje, el patrón de sueño-vigilia, el deseo y disfr...

  15. Carga de treinamento durante exercício resistido e aeróbio com intensidades autosselecionada e imposta

    OpenAIRE

    Dias, Marcelo Ricardo Cabral

    2016-01-01

    Tese de Doutoramento em Ciências do Desporto A autosseleção da carga de treinamento não é uma tarefa simples para se alcançar um objetivo. A percepção do que é leve ou pesado, bem como o alcance da fadiga, é de difícil aprendizado. Portanto, é essencial que os profissionais do fitness acompanhem de perto a intensidade e o esforço percebido durante a fase de adoção de programas de exercícios. Com isso, o objetivo do presente estudo teve dois caminhos: realizar um levantamento da literatura ...

  16. Sacudidas salariales y variabilidad del consumo en México durante los años 90

    OpenAIRE

    Miguel Székely; Attanasio, Orazio P.

    2001-01-01

    (Disponible en idioma inglés únicamente) En este trabajo se presentan elementos de juicio sobre la relación entre las sacudidas económicas y el salario relativo de los varones y los cambios de consumo de los hogares en México durante los años 90, un período caracterizado por una inestabilidad elevada. Además de realizar esta clase de análisis con México por primera vez, el trabajo presenta dos aportes principales. El primero es el uso de fuentes alternativas de datos para construir variables ...

  17. Tabaquismo durante el embarazo: Efectos en la salud respiratoria infantil Smoking during pregnancy: Effects on respiratory children's health

    OpenAIRE

    VIVIANA AGUIRRE C

    2007-01-01

    La prevalencia de tabaquismo en mujeres en edad fértil alcanza cifras entre 20-30% en países desarrollados, con prevalencias nacionales entre 40-55%. Fumar cigarrillo durante el embarazo ha sido implicado en diversas patologías obstétricas y neonatales, tales como desprendimiento de placenta, placenta previa, embarazo ectópico, aborto espontáneo, parto prematuro, mortinato, síndrome de distrés respiratorio del neonato, bajo peso de nacimiento, síndrome de muerte súbita, alteraciones neurocogn...

  18. Amorales, patoteros, chongos y pitucos. La homosexualidad masculina durante el primer peronismo [Buenos Aires, 1943-1955

    OpenAIRE

    Omar Acha; Pablo Ben

    2004-01-01

    Este artículo estudia la identificación de los homosexuales varones como un grupo singular durante la primera década peronista, bajo la figura de los "amorales". A diferencia de principios de siglo XX, donde estaban integrados en el caótico ambiente de la mala vida. Los varones de mediados de siglo que tenían relaciones sexuales con varones comenzaron a ser destacados como una desviación peligrosa del ideal familiarista y heterosexista. Este proceso se explica a través de la masculinización d...

  19. Intoxicaciones agudas por psicofármacos y drogas de abuso en Pontevedra durante el año 2001

    OpenAIRE

    Fernández, P.; R. Sertal; A.M. Bermejo; M.J. Tabernero

    2005-01-01

    Se presenta un estudio epidemiológico de las intoxicaciones agudas por psicofármacos y drogas de abuso (excluyendo el alcohol), atendidas en el Servicio de Urgencias de adultos del Complejo Hospitalario de Pontevedra (CHOP) durante el año 2001. Utilizando el test cualitativo de screening de drogas de abuso Triage TM8 (Biosite Diagnostics), se analizaron 554 orinas, de las cuales 318 resultaron positivas, lo que supone un 0,56% del total de urgencias atendidas en este Cent...

  20. Expansão paradoxal de lesões de tuberculose cerebral durante o uso de tuberculostáticos

    OpenAIRE

    ANDRADE FILHO ANTÔNIO DE SOUZA; GOMES ANDRÉ GUANAES; LEMOS ANTÔNIO CARLOS MOREIRA DE; NEVES MARGARIDA COSTA; SOUZA YURI MASCARENHAS DE ANDRADE; PEREIRA SAMIRA LUISA DOS APÓSTOLOS; SOUZA ANDRÉIA PELTIER DE QUEIROZ URBANO DE; SANTOS PATRÍCIA LAGO DOS

    1999-01-01

    O acometimento do sistema nervoso central pela tuberculose pode se manifestar de duas formas principais: tuberculose meníngea ou tuberculoma. Esta forma é uma condição que vinha decrescendo progressivamente, mas que encontrou nos dias atuais condições ideais para o seu desenvolvimento. O presente estudo discorre sobre três pacientes que desenvolveram expansão paradoxal de lesões de tuberculose cerebral durante o uso de tuberculostáticos, o que demonstra ser importante o acompanhamento tomográ...