Sample records for ISOTOPOS DE CARBONO (carbon isotopes)
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1

Estudio de flujos verticales de carbono y nitrógeno en ambientes acuáticos controlados en la bahía de Knebel, Dinamarca utilizando isótopos estables de nitrógeno y carbono (15N y 13C)/ A study of the vertical flow of carbon and nitrogen in controlled aquatic environments at the Knebel Bay, Denmark, with the use of the stable isotopes of nitrogen and carbon (15N y 13C)

DANERI, GIOVANNI
2001-09-01

Resumen en español En este estudio se utilizaron isótopos estables como trazadores para caracterizar y cuantificar el flujo vertical de carbono y nitrógeno. Los experimentos se llevaron a cabo en la bahía de Knebel, Dinamarca (56 08' N, 10 11' E), en dos ambientes acuáticos controlados tipo mesocosmos. La adición de nutrientes inorgánicos estimuló el afloramiento del flagelado no-tóxico Prorocentrum minimum, determinando un comportamiento similar en las mediciones de clorofila a (Cl (mas) o-a), nitrógeno orgánico particulado (NOP) y carbono orgánico particulado (COP) en ambos mesocosmos. Bajo condiciones no limitantes de nutrientes inorgánicos existió una baja discriminación isotópica resultando en bajos valores de delta13C en el COP en suspensión y sedimentado. El desfase entre los máximos de NOP, Clo-a y COP así como la rápida asimilación del nitrato adicionado en menos de tres días y una razón C/N variable indican que P. minimum posee una gran habilidad para asimilar nitrógeno inorgánico. La razón C/N alcanzó un mínimo al inicio del experimento, para luego aumentar una vez agotado el nitrato de la columna de agua. El nitrógeno nuevo sedimentado alcanzó un 10 a 11 % del total originalmente adicionado a la columna de agua en la forma de nitrato, sin que se observara una sedimentación masiva de P. minimum durante los días de duración de este experimento Resumen en inglés Stable isotopes were used as tracers to characterize and quantify the downward flux of carbon and nitrogen. The experiments were conducted in Knebel bay, Denmark (56 08' N, 10 11' E), in two controlled aquatic environments (mesocosm type). The addition of inorganic nutrients to the mesocosms stimulated a bloom of the non-toxic flagellate Prorocentrum minimum. A similar pattern in the concentration of chlorophyll a (Chl-a), particulate organic nitrogen (PON) and particulat (mas) e organic carbon (POC) was observed in both mesocosms. The elevated nutrient conditions resulted in low isotopic discrimination, this was reflected in low delta13C values of the suspended and sediment POC. The uncoupling between the peaks of PON, Chl-a and POC, as well as the rapid assimilation of the added nitrate (in less than three days) and a changing C/N ratio indicate that P. minimum has a great ability to assimilate inorganic nitrogen. The C/N ratio reached a minimum at the beginning of the experiment increasing later, once nitrate depletion was reached. The sedimentation of new nitrogen during this study was 10-11 % of the total originally added to the water column. No massive sedimentation of P. minimum was observed once the nitrate added to the mesocosms was utilized

Scientific Electronic Library Online (Spanish)

2

ISÓTOPOS ESTABLES DEL CARBONO EN PATAGONIA MERIDIONAL: DATOS DE LA CUENCA DEL LAGO SALITROSO (PROVINCIA DE SANTA CRUZ, REPÚBLICA ARGENTINA)/ CARBON STABLE ISOTOPES IN PATAGONIA MERIDIONAL: DATA FROM THE SALITROSO LAKE BASIN (SANTA CRUZ PROVINCE, ARGENTINA)

TESSONE, AUGUSTO; ZANGRANDO, A. FRANCISCO; BARRIENTOS, GUSTAVO ; VALENCIO, SUSANA; PANARELLO, HÉCTOR; GOÑI, RAFAEL
2005-11-01

Resumen en español En este artículo se presentan y discuten los resultados de estudios de isótopos estables del carbono efectuados sobre restos óseos humanos pertenecientes a 25 individuos procedentes de la localidad Sierra Colorada (cuenca del lago Salitroso), entre los cuales 19 han sido datados directamente usando 14C-AMS (ca. 2750 a 300 años Cal. AP). A partir de dicha información, exploramos la composición de la dieta durante el Holoceno tardío y, a nivel intra-poblacional, comp (mas) aramos los valores de δ13C con las categorías de sexo y edad identificadas en la muestra. Asimismo, examinamos las propiedades químicas, elementales e isotópicas de las muestras óseas analizadas con el fin de evaluar el grado de preservación de la señal isotópica primaria y de medir su utilidad como indicador de paleodieta. En lo que respecta a la ecología isotópica, aportamos nuevos valores de δ13C de muestras de guanacos y vegetales de la zona. Los resultados obtenidos ratifican la importancia de los ecosistemas terrestres en la dieta de estas poblaciones y la baja o nula incorporación de recursos marinos Resumen en inglés This work presents and discusses the carbon isotope data obtained from the analysis of human bone remains from 25 individuals of the locale of Sierra Colorada (Salitroso lake basin), 19 of which have been dated directly by 14C-AMS to between ca. 2750 and 300 cal. BP. This information enables us to examine diet composition through the Late Holocene and to compare the δ13C values within sex and age categories at intra-population level. We have also examined the chemica (mas) l, elemental, and isotopic properties of bone samples in order to evaluate the degree of preservation of the primary isotopic signal and their suitability as palaeodiet indicator. As a contribution to isotope ecology, we supply new δ13C values for local samples of plants and guanacos. The results obtained highlight the importance of terrestrial ecosystems in the diet of these populations and their low or negligible intake of marine resources

Scientific Electronic Library Online (Spanish)

3

Using stable isotopes of nitrogen and carbon to study seabird ecology: applications in the Mediterranean seabird community | El empleo de isótopos estables de nitrógeno y carbono para estudiar la ecología de las aves marinas: aplicaciones a la comunidad de aves marinas del mediterráneo

Forero, Manuela G. ; Hobson, Keith A.

Publicación online disponible en: http://www.icm.csic.es/scimar/index.php | [EN] The application of the stable isotope technique to ecological studies is becoming increasingly widespread. In the case of seabirds, stable isotopes of nitrogen and carbon have been mainly used as dietary tracers. This a...

DRIVER (Spanish)

4

EL USO DE ISÓTOPOS ESTABLES EN BIOLOGÍA TROPICAL

Louis S., Santiago; Silvera, Katia; Andrade, José Luis; Dawson, Todd E
2005-09-01

Resumen en portugués O uso de isótopos estáveis em biologia tem aumentado nos últimos anos devido ao grande poder que têm essas técnicas para medir processos que antes eram difícil ou impossível de quantificar utilizando outros métodos. Apesar de que a maioria dos estudos com isótopos tem-se concentrado em zonas temperadas, em anos recentes tem aumentado os estudos realizados nos trópicos, o qual ha permitido entender em detalhe processos complexos. Esta revisão enfatiza aqueles es (mas) tudos que utilizam a composição isotópica de hidrogênio, carbono, nitrogênio e oxigênio para estudar processos biogeoquímicos em ambientes tropicais, tanto a escala molecular como regional. Ao detalhar os avanços recentes sobre estudos nos trópicos, se espera estimular mais estudos nesta área. Também, com base nos resultados assombrosos que se obtêm usando isótopos em biologia tropical, se tem a certeza de que os isótopos estáveis proporcionarão avanços exitantes no futuro. Resumen en español El uso de isótopos estables en biología ha aumentado en los últimos años debido al gran poder que tienen los isótopos para medir procesos que antes eran difícil o imposible de cuantificar utilizando otros métodos. A pesar de que la mayoría de los estudios con isótopos se han concentrado en zonas templadas, en años recientes han aumentado los estudios realizados en los trópicos, lo cual ha permitido entender en detalle procesos complejos. Esta revisión enfatiza (mas) aquellos estudios que utilizan la composición isotópica de hidrógeno, carbono, nitrógeno y oxígeno para estudiar procesos biogeoquímicos en ambientes tropicales, tanto a escala molecular como regional. Al detallar los avances recientes sobre estudios en los trópicos, se espera estimular más estudios en esta área. También, con base en los resultados asombrosos que se obtienen usando isótopos en biología tropical, se tiene certeza de que los isótopos estables proporcionarán avances exitantes en el futuro. Resumen en inglés The use of stable isotopes in biology has increased in recent years because of the power of these techniques to measure processes that are difficult or impossible to quantify using other methods. Although most isotopic research has been concentrated in temperate zones, there has been an increase in isotopic studies in the tropics in recent years that have led to the understanding of detailed processes in complex ecosystems. This review highlights studies that use isotopic (mas) composition of hydrogen, carbon, nitrogen, and oxygen to study biogeochemical processes in tropical environments from molecular up to regional scales. By describing the current state of knowledge in isotopic studies in the tropics, it is hoped to stimulate more research in this area. Based on the spectacular results obtained from the use of isotopes in tropical biology, there is confidence that isotopes will lead to exciting advances in the future.

Scientific Electronic Library Online (Spanish)

5

Inclusiones fluidas e isotopos estables en la ganga de los yacimientos de manganeso del norte de la provincia de Córdoba/ Fluid inclusions and stable isotopes in non-ore minerals of the manganese ore deposits in the north of the Córdoba province

Leal, P.R.
2002-09-01

Resumen en español En este trabajo se analizan las características físico-químicas asociadas a la precipitación de la ganga de yacimientos epitermales de manganeso. Estos minerales fueron formados principalmente durante la etapa póstuma del sistema, el cual es posible dividir espacialmente en tres sectores en función del mineral más abundante. En esta oportunidad se estudia el sector austral donde el mineral más común es la calcita. El análisis microtermométrico de las inclusione (mas) s fluidas sobre muestras de calcita, baritina y fluorita, hizo posible obtener salinidades del fluido de 2,7 y 4% eq. en peso NaCl y temperaturas inferiores a 100°C. Los estudios de isótopos de 13C, 18O y 34S en calcita y baritina permitieron determinar la fuente meteórica de los fluidos asociados a su precipitación. Al mismo tiempo los valores de δ;;13C en calcita se consideran el resultado de un fluido en equilibrio con CO2 atmosférico y cantidades menores de carbono producto de la disolución de compuestos orgánicos. Por otro lado, los valores de δ;;34S de la baritina pueden ser explicados por un fluido con H2S que resulta de la disolución de sulfuros de las rocas de caja. Finalmente, se postula la presencia de dos fluidos. Un fluido ascendente fue el responsable de la precipitación de la baritina en la zona donde el H2S se oxida a SO4=; al mismo tiempo, éste pudo también formar fluorita y variedades de sílice conforme su temperatura desciende. La existencia de un fluido descendente permite explicar la generación de calcita por calentamiento del mismo. Resumen en inglés In this paper the non-ore minerals of the southern sector of this deposit are studied. Microthermometric analysis on calcite, barite and fluorite show fluid salinities of 2.7 and 4% wt eq. NaCl, and temperatures below 100°C. Isotopes of 13C, 18O and 34S allow to determine a meteoric source for the fluids associated to their precipitation. The δ;;13C values obtained in calcite are considered the result of a fluid in equilibrium with atmospheric CO2 plus the addition (mas) of carbon due to dissolution of organic compounds. On the other hand, the δ;;34S values of barites can be explained by another fluid with H2S contents resulting from the dissolution of sulfides from the wall-rock. Finally, the presence of two different fluids is postulated here. An upward fluid was responsible for the barite precipitation where the H2S was oxidized to SO4=. This fluid could form fluorite and silica varieties as its temperature decreases. The existence of a downward fluid explains calcite generation as the descending fluid is heated.

Scientific Electronic Library Online (Spanish)

6

Geoquímica sedimentaria en áreas de pesca de arrastre y no arrastre de fondo en la costa de Sinaloa-Sonora, Golfo de California/ Geochemistry of sediments in areas affected and unaffected by dredge fishing by the Sonora-Sinaloa coast, Gulf of California

Sánchez, Alberto; Aguíñiga, Sergio; Lluch-Belda, Daniel; Camalich-Carpizo, Jaime; Del Monte-Luna, Pablo; Ponce-Díaz, Germán; Arreguín-Sánchez, Francisco
2009-01-01

Resumen en español Los estudios geoquímicos y sedimentológicos realizados para evaluar el efecto de la pesca de arrastre de fondo en México, son prácticamente inexistentes. En el presente trabajo se contrastan sitios de arrastre y no arrastre de la pesca del camarón en la costa de Sinaloa-Sonora. El análisis del tamaño de grano medio indicó diferencias estadísticamente significativas entre sitios de arrastre y no arrastre. Sorprendentemente, las variables geoquímicas (carbonato de (mas) calcio, carbono y nitrógeno orgánico, la razón C/N y los isótopos estables de carbono y nitrógeno) en ambas áreas (prístinas e impactadas), no fueron estadísticamente diferentes. Nuestros datos sugieren que el transporte de materiales y energía regularían, de manera similar en ambas zonas, los procesos biogeoquímicos que determinan los intervalos de estas variables y que no las hace estadísticamente diferentes. Aparentemente el ecosistema bajo el efecto de la pesca de arrastre de fondo en la costa de Sinaloa-Sonora, Golfo de California es capaz de absorber este impacto. Resumen en inglés The geochemical and sedimentological studies conducted to assess the impact of bottom trawling in Mexico, are virtually absent. In this research are contrasted trawling and not-trawling sites of shrimp fishing in the coast of Sinaloa-Sonora. The analysis of grain-size indicated statistically significant differences between trawling and not-trawling sites. Unexpectedly, the geochemical variables (calcium carbonate, carbon and organic nitrogen, the ratio C/N and the stables (mas) isotopes of carbon and nitrogen) in both areas (pristine and impacted) were not statistically different. Our data suggest that the transport of materials and energy regulated, in both areas, biogeochemical processes that determine the ranges of these variables and that make them not statistically different. In fact, the ecosystem under the effect of bottom trawling in the coast of Sinaloa-Sonora is able to absorb this impact.

Scientific Electronic Library Online (Spanish)

7

Petrográfica y Geoquímica de la dolomía hospedante de una mineralización de Zn y Pb. Puesto Gregor, Neuquén, Argentina/ Petrography and geochemistry of a Zn- Pb mineralization hosted in a dolostone, Puesto Gregor, Neuquen, Argentina

Gómez, M. Cristina; Garrido, Mirta; Cesaretti, Nora; Domínguez, Eduardo
2008-07-01

Resumen en español En la Cuenca Neuquina (Argentina) y asociada a la Formación Lajas (Jurásico) se mencionó por primera vez una mineralización de esfalerita y galena asociada a carbonatos. En el área del yacimiento Puesto Gregor, ésta Formación está constituida por una secuencia clástico carbonática. Para caracterizar el ambiente de depositación de la dolomía hospedante de la mineralización de Zn y Pb se realizaron estudios petrográficos y geoquímicos. Entre los últimos los (mas) más utilizados son los análisis e interpretación de isótopos estables (O, C), elementos mayoritarios y trazas e inclusiones fluidas. En el horizonte dolomítico de 0,90 m de espesor y 300 m de corrida se distinguen petrográficamente dos tipos de dolomita: el primer tipo es penetrativo, sin preservación de la fábrica sedimentaria original y es anterior a la mineralización, el segundo tipo está vinculado a la precipitación de sulfuros y consiste en una dolomita de tipo silla de montar (saddle). El estudio de las inclusiones fluidas en la dolomita penetrativa indica la presencia de fluidos orgánicos y fluidos acuosos. Determinaciones microtermométricas sobre inclusiones fluidas acuosas revelaron temperaturas de 140º C. Geoquímicamente la capa presenta proporciones casi estequiométricas y promedios de CaCO3 y MgCO3 iguales al 52 y 48% molar, respectivamente. En cuanto a los elementos trazas, el Sr varió entre 79 y 159 ppm y el Na entre 74 y 225 ppm. Los contenidos de Mn y Fe son mucho más altos que los valores determinados para estos elementos en rocas carbonáticas. El contenido en ETR es bajo y los diagramas de ETR muestran una anomalía negativa de Ce y de Eu. Se determinaron valores de isótopos de C y O. Los valores de ä13 C (VPDB) entre -2,9 y -9 0/00 no son coherentes con los datos informados para calizas marinas de edad jurásica mientras que los valores de ä18O(VPDB) entre -2,6 y -4 0/00 coinciden con los valores informados para carbonatos de igual edad. Los datos de ä18O indican que la interacción entre el fluido y la roca de caja fue baja. Los valores del ä18O del fluido en equilibrio con la dolomía a temperaturas de 140ºC indican que este fluido corresponde a una salmuera de cuenca. Por otro lado, los isótopos de carbono indican un aporte de carbono procedente de la diagénesis de la materia orgánica causada por un aumento de temperatura vinculada al soterramiento de la cuenca. Los resultados petrográficos y geoquímicos son consistentes con la dolomitización de un carbonato de origen marino que sufrió soterramiento. Resumen en inglés In Neuquen Basin, Argentina, a Zn-Pb mineralization was first reported by Garrido et al. (2000). The ore occurs in a carbonatic level located in Puesto Gregor, 50 km SSE from the city of Zapala at 39°11'34'' S, 69° 59'18'' W (Fig. 1). The hosting bed, a dolostone, belongs to a carbonatic-siliciclastic sequence of Lajas Formation, which is part of the Cuyo Group, Jurassic age. In the mineralization of Pb-Zn deposits associated to dolostones, the fluids that were involved (mas) in the ore precipitation process were also related to the dolomitization of the carbonatic rock (Warren, 2000). In this contribution, field, petrographic and geochemical studies were carried out in order to determine the temperature and composition of the dolimitizing fluids. The obtained results were then compared to those obtained from Carbon and Oxygen isotopes (Garrido et al., 2001) to discuss the dolimitization process. The mineralized bed, 0.90 m thick, outcrops for about 300 m along the strike (W-E) and 60 m in the dip direction (Fig. 2). This bed pinches out toward the east and toward the west it is no longer visible, it is cover by scours. Petrographic studies determined that the host rock is a dolostone with a breccia texture that becomes more siliciclastic towards the east grading thus to a fine sandstone with carbonatic cement. The hypogenic mineralization, mainly sphalerite, low quantities of galena, pyrite and marcasite is found within the small fractures. Some ghosts of fossils are still visible, but pervasive dolomitization characterizes the horizon. Two distinct dolomites are recognized by crosscutting relationships: a fine to medium grained crystalline dolomite, and a coarse grained crystalline dolomite related to the mineralization. The fomer shows dark-orange and white crystals which occur as patches or partially filled vugs. These crystals are 120-400 mm in size and exhibit subhedral to anhedral shapes (Fig. 3). According to Sibley and Gregg (1987), the texture is no planar -a- unimodal to polimodal. The latter dolomite presents well developed crystals (> 5 mm); they are translucent with pink color and pearl shine and have crystal faces that look like a pavement and is referred as "saddle" dolomite according to Radke and Mathis (1980). This "saddle" dolomite is found into dissolution cavities or as clusters of crystals located on the wall fractures; it is always associated to the mineralization. Chemical analysis of major, traces and rare earth elements are homogeneous throughout the bed. Mean values are 15% MgO, 29,66% CaO and 40,43 % CO2, with high MnO and Fe2O3 contents. The molar percentages of CaCO3 and MgCO3 indicate near stoichiometric ratio (52% and 48%) with a light excess of Ca (Table 1, Fig. 4). The trace elements Sr, Na, Fe and Mn are used to constrain dolomite evolution. Sr values varies from 79 to 159 ppm and Na from 74 to 225 ppm; Mn and Fe contents are higher than the values determined for carbonatic rocks (Turekian and Wedepohl, 1961). ÓREE and LREE contents are low, and the diagram normalized to chondrite shows a negative anomaly of Eu and a great negative anomaly of Ce. The 13C (VPDB) and 18O (VPDB) values vary from -2,9 to -9(0)/00 and from -2,6 to -4 0/00 respectively (Table 2). The 13C are incoherent with the data recorded for Jurassic marine carbonates (near 0 0/00) while 18O values can be correlated with carbonates of the same age (Veizer et al., 1999). Petrography and chemical analysis allow characterizing the depositional environment of the Zn- Pb mineralized dolostone. The xenotopic texture of the dolomite with no planar crystals, gives evidence that the temperatures of deposition should have been higher than 50-60°C (Gregg and Sibley, 1984). On the other hand, the chemical composition, near ideal dolomites (stoichiometric ratio), indicates slow crystallization at high temperature (Morrow, 1982). Morover, the destructive fabric and the homogeneous composition suggest a high temperature dolomitization (Machel, 2004). Trace element values, mainly Na and Sr, agree with burial dolomites, as well as the fluid inclusions reported for these samples by Cesaretti et al. (2002). The negative Ce anomaly indicates that these rocks were formed in a marine environment. Two different processes of carbonate precipitation can produce negative Ce anomaly (Möller, 1989; Bau and Möller, 1992): deposition from seawater or from hydrothermal solutions equilibrated with highly oxydized sediments. The latter is discarded because of the presence of framboidal pyrite and organic matter, which, along with the Eu negative anomaly indicates that the dolimitization were generated under euxinic conditions. This dolostone is in contact with anoxic mudstones (Los Molles Formation, Cuyo Group). Petrographic and geochemical criteria reflect that the dolomitization were caused by normal or modified sea water in a burial environment at temperatures above 140ºC. In burial or altered dolostones, the oxygen isotopes reflect temperature of precipitation and isotope composition of the dolomitizing fluids. The oxygen isotope values of this dolomitized bed are compatible with the isotope composition of carbonates precipitated from sea water at 25°C. The narrow range in the obtained values indicates that there was no influence of meteoric water during this process (Allan and Mathews, 1982). The homogeneous values of 18O isotope suggest that the physic-chemical conditions remained constant during dolomitization, what is in agreement with the textural and geochemical homogeneity found in the study samples. The 18O isotope values of a fluid equilibrated with carbonate at 140°C indicate that the fluid belongs to a basinal fluid. The 13C isotopes reflect an organic origin for the carbon. This carbon came from the diagenesis of organic matter caused by an increase in temperature during the burial of the basin (Garrido et al., 2001; Cesaretti et al., 2002). In contrast with other MVT deposits of the world, in Puesto Gregor, the dolomitization was slow process acting at high temperatures, what has been confirmed by the homogeneity of the fabric and the narrow range in the isotope and trace elements composition. These conditions were reached during burial of the basin where the rocks interact with the basin fluids associated to the ore minerals.

Scientific Electronic Library Online (Spanish)

8

Vigilància ambiental de metil tert-butil èter (mtbe), un additiu de la gasolina, en aigües i sòls

Barceló, Damià; Lacorte Bruguera, Silvia; Rosell Linares, Mònica
2006-01-01

Digital.CSIC (Spain)

9

Variations in 13C/12C and D/H enrichment factors of aerobic bacterial fuel oxygenate degradation

Rosell Linares, Mònica; Barceló, Damià; Rohwerder, Thore; Breuer, Uta; Gehre, Matthias; Richnow, Hans Hermann
2007-02-03

Digital.CSIC (Spain)

13

The slowly expanding envelope of CRL618 probed with HC3N rotational ladders

Pardo Carrión, Juan Ramón; Cernicharo, José; Goicoechea, Javier R.; Phillips, Thomas G.
2004-07-09

Digital.CSIC (Spain)

14

The clayey fissural fillings associated with N100º-110ºE fractures at the El Berrocal uranium mine (Sierra de Gredos, Spain): characterization, genesis and retention capacity of radioactive and other elements

Pérez Del Villar, L.; De la Cruz, B.; Cózar, J. S.; Pardillo, J.; Gómez, P.; Turrero, M. J.; Reyes, Emilio; Delgado Huertas, Antonio; Caballero, E.
1993-08-30

Digital.CSIC (Spain)

15

The abundance of 36S in IRC+10216 and its production in the Galaxy

Gallino, R.; Cernicharo, José; Henkel, C.; Ott, U.; Mauersberger, R.
2004-06-30

Digital.CSIC (Spain)

16

The Taravilla Lake and Tufa Deposits (Central Iberian Range, Spain) as paleohydrological and paleoclimatic indicators

Valero-Garcés, Blas L.; Moreno Caballud, Ana; Navas Izquierdo, Ana; Mata, M. Pilar; Machín Gayarre, Javier; Delgado Huertas, Antonio; González-Sampériz, Penélope; Schwalb, Antje; Morellón, Mario; Edwards, Larry
2008-03-24

Digital.CSIC (Spain)

17

The Mantos Blancos copper deposit: an upper Jurassic breccia-style hydrothermal system in the Coastal Range of Northern Chile

Ramírez, L. E.; Palacios, C.; Townley, B.; Parada, Miguel Ángel; Sial, A. N.; Fernandez-Turiel, J. L.; Gimeno, D.; García-Vallés, M.; Lehmann, B.
2006-01-01

Digital.CSIC (Spain)

19

Synthetic coal chars for the elucidation of NO heterogeneous reduction mechanisms

Pevida García, Covadonga; Arenillas de la Puente, Ana; Rubiera González, Fernando; Pis Martínez, José Juan
2007-01-01

Digital.CSIC (Spain)

21

Structural characterization of kerogen in 3.4 Ga Archaean cherts from the Pilbara Craton, Western Australia

Marshall, Craig P.; Love, Gordon D.; Snape, Colin E.; Hill, Andrew C.; Allwood, Abigail C.; Walter, Malcolm R.; Van Kranendonk, Martin J.; Bowden, Stephen A.; Sylva, Sean P.; Summons, Roger E.
2007-05-05

Digital.CSIC (Spain)

22

Stratified scree in the Central Spanish Pyrenees: palaeoenvironmental implications

García-Ruiz, José María; Valero-Garcés, Blas L.; González-Sampériz, Penélope; Lorente, Adrián; Martí Bono, Carlos Enrique; Beguería, Santiago; Edwards, Larry
2001-01-01

Digital.CSIC (Spain)

23

Shell structure of the near-dripline nucleus O-23

Cortina-Gil, D.; Fernández-Vázquez, J.; Aumann, T.; Baumann, T.; Benlliure, J.; García Borge, María José; Chulkov, L. V.; Datta Pramanik, U.; Forssén, C.; Fraile, Luis M.; Geissel, H.; Gerl, J.; Hammache, F.; Itahashi, K.; Janik, R.; Jonson, B.; Mandal, S.; Markenroth, K.; Meister, M.; Mocko, M.; Münzenberg, G.; Ohtsubo, T.; Ozawa, A.; Prezado, Yolanda; Pribora, V.; Riisager, K.; Scheit, H.; Schneider, R.; Schrieder, G.; Simon, H.; Sitar, B.; Stolz, A.; Strmen, P.; Sümmerer, K.; Szarka, I.; Weick, H.
2004-08-06

Digital.CSIC (Spain)

24

Searching for the H-5 resonance in the t+n+n system

Meister, M.; Chulkov, L. V.; Simon, H.; Aumann, T.; García Borge, María José; Elze, Th. W.; Emling, H.; Geissel, H.; Hellström, M.; Jonson, B.; Kratz, J. V.; Kulessa, R.; Leifels, Y.; Markenroth, K.; Münzenberg, G.; Nickel, F.; Nilsson, T.; Nyman, G.; Pribora, V.; Richter, A.; Riisager, K.; Scheidenberger, C.; Schrieder, G.; Tengblad, Olof
2003-04-17

Digital.CSIC (Spain)

25

Regulation of growth, water use efficiency and d13C by the nitrogen source in Casuarina equisetifolia Forst. & Forst.

Martínez-Carrasco, R.; Pérez, P.; Handley, L.L.; Scrimgeour, C.M.; Igual, J. M.; Martín del Molino, Isabel; Sánchez de la Puente, L.
1998-01-01

Digital.CSIC (Spain)

28
30

One-neutron knockout of O-23

Cortina-Gil, D.; Fernández-Vázquez, J.; Aumann, T.; Baumann, T.; Benlliure, J.; García Borge, María José; Chulkov, L. V.; Pramanik, U. Datta; Forssén, C.; Fraile, Luis M.; Geissel, H.; Gerl, J.; Hammache, F.; Itahashi, K.; Janik, R.; Jonson, B.; Mandal, S.; Markenroth, K.; Meister, M.; Mocko, M.; Münzenberg, G.; Ohtsubo, T.; Ozawa, A.; Prezado, Yolanda; Pribora, V.; Riisager, K.; Scheit, H.; Schneider, R.; Schrieder, G.; Simon, H.; Sitar, B.; Stolz, A.; Strmen, P.; Sümmerer, K.; Szarka, I.; Weick, H.
2005-07-14

Digital.CSIC (Spain)

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33

Multiproxy reconstruction of the palaeoclimate and palaeoenvironment of the Middle Miocene Somosaguas site (Madrid, Spain) using herbivore dental enamel

Domingo, Laura ; Cuevas-González, Jaime ; Grimes, Stephen T. ; Hernández Fernández, Manuel ; López-Martínez, Nieves

16 pages, 11 figures, 3 tables.-- Available online Nov 17, 2008.-- This work is a contribution from the research groups UCM-CAM 910161 on Geologic Record of Critical Periods: Palaeoclimatic and Palaeonvironmental Factors, and UCM-CAM 910607 on Evolution of Cenozoic Mammals and Continental Palaeoenvi...

DRIVER (Spanish)

34

Multiproxy reconstruction of the palaeoclimate and palaeoenvironment of the Middle Miocene Somosaguas site (Madrid, Spain) using herbivore dental enamel

Domingo, Laura; Cuevas-González, Jaime; Grimes, Stephen T.; Hernández Fernández, M.; Lopez-Martinez, N.
2009-02-01

Digital.CSIC (Spain)

35
36

Lead isotope ratios in a soil from a coal carbonization plant

Díaz Somoano, Mercedes; Calvo Díez, Montserrat; López Antón, M.ª Antonia; Suárez Ruiz, Isabel; García Fernández, Roberto; Rodríguez Moinelo, Sabino J.; Martínez Tarazona, M.ª Rosa
2007-05-01

Digital.CSIC (Spain)

37

Lead isotope ratios in Spanish coals of different characteristics and origin

Díaz Somoano, Mercedes; Suárez Ruiz, Isabel; Alonso, J. I. G.; Ruiz Encinar, J.; López Antón, M.ª Antonia; Martínez Tarazona, M.ª Rosa
2007-06-01

Digital.CSIC (Spain)

38

Isotopic signatures of extinct low-temperature hydrothermal chimneys in the Jaroso Mars analog

Martínez-Frías, Jesús ; Delgado-Huertas, Antonio ; García-Moreno, Francisco ; Reyes, Emilio ; Lunar, Rosario

8 pages, 5 figures.-- ISI Article Identifier: 000244984600006.-- Available online Nov 15, 2006. | The present work presents a geochemical study, focused on the oxygen and carbon isotopic signatures of shallow-marine, carbonate extinct chimneys, from Jaroso Hydrothermal System (JHS). In each chimney ...

DRIVER (Spanish)

39

Isotopic signatures of extinct low-temperature hydrothermal chimneys in the Jaroso Mars analog

Martínez-Frías, Jesús; Delgado Huertas, Antonio; García-Moreno, Francisco; Reyes, Emilio; Lunar, Rosario; Rull, Fernando
2007-03-01

Digital.CSIC (Spain)

40

Internal features, mineralogy and geochemistry of ferromanganese nodules from the Gulf of Cadiz: The role of the Mediterranean Outflow Water undercurrent

González, F. J.; Somoza, L.; Lunar, Rosario; Martínez-Frías, Jesús; Martín Rubí, J. A.; Torres, T.; Ortiz, J. E.; Díaz del Río, Víctor
2010-03-01

Digital.CSIC (Spain)

41

Interaction between Calcite and Phosphorus in Biomineralization Processes in Tufa Carbonates

Souza-Egipsy, Virginia; García del Cura, M.ª Ángeles; Ascaso, Carmen; Ríos, Asunción de los; Wierzchos, Jacek; González Martín, J. A.
2006-03-01

Digital.CSIC (Spain)

42

Igneous Origin of CO2 in Ancient and Recent Hot-Spring Waters and Travertines from the Northern Argentinean Andes

Gibert, Roger O.; Taberner, Conxita; Sáez, Alberto; Giralt, Santiago; Alonso, Ricardo N.; Edwards, R. Lawrence; Pueyo Mur, Juan José
2009-01-01

Digital.CSIC (Spain)

43

Hydrocarbon-derived ferromanganese nodules in carbonate-mud mounds from the Gulf of Cadiz: Mud-breccia sediments and clasts as nucleation sites

González, F. J.; Somoza, L.; Lunar, R.; Martínez-Frías, Jesús; Martín Rubí, J. A.; Torres, T.; Ortiz, J. E.; Díaz del Río, Víctor; Pinheiro, L. M.; Magalhães, V. H.
2009-06-01

Digital.CSIC (Spain)

44
46

Food-web structure and trophodynamics of mesopelagic–suprabenthic bathyal macrofauna of the Algerian Basin based on stable isotopes of carbon and nitrogen

Fanelli, Emanuela ; Cartes, Joan Enric ; Rumolo, P. ; Sprovieri, M.

17 pages, 9 figures, 3 tables.-- Printed version published Sep 2009. | The trophodynamics of mesopelagic (macrozooplankton/micronekton) and benthic boundary layer (suprabenthos=hyperbenthos) faunas from the Algerian Basin were characterized on a seasonal scale through stable carbon and nitrogen isot...

DRIVER (Spanish)

49

Fermented wheat germ extract inhibits glycolysis/pentose cycle enzymes and induces apoptosis through poly(ADP-ribose) polymerase activation in Jurkat T-cell leukemia tumor cells

Comín Anduix, Begoña; Boros, László G.; Marin, Silvia; Boren, Joan; Callol Massot, Carles; Centelles, Josep J.; Torres, Josep Lluis; Agell, Neus; Bassilian, Sara; Cascante, Marta
2002-09-25

Digital.CSIC (Spain)

50
53

Elucidating the role of genetic drift and natural selection in cork oak differentiation regarding drought tolerance

Ramirez Valiente, A.; Lorenzo, Z.; Soto, A.; Valladares, Fernando; Gil, L.; Aranda, I.
2009-05-25

Digital.CSIC (Spain)

54

Effects of sample pre-treatment on the d13C and d18O values of living benthic foraminifera

Serrano, Oscar ; Serrano, Laura ; Mateo, Miguel Angel

Stable carbon and oxygen isotope ratios (δ13C and δ18O) of the epibenthic foraminiferan Elphidium macellum var. aculeatum were measured and compared both in raw aliquots and after various pre-analytical treatments. We tested the effects of chemical cleaning procedures (oxygen plasma ashing, NaClO an...

DRIVER (Spanish)

56

ECOSER Project: toward a better understanding of the mechanisms of carbon stabilization in agricultural soils amended with municipal organic wastes

Plaza de Carlos, César; Sanz, Rafael; Hernáiz, Pedro J.; García-Gil, Juan C.; Soler-Rovira, Pedro A.; Fernández, José M.; Hernández, Diana; Haller, Isabel; Polo, Alfredo
2009-01-01

Digital.CSIC (Spain)

57

Differential response of d13C and water use efficiency to arbuscular mycorrhizal infection in two aridland woody plant species

Querejeta Mercader, José Ignacio; Barea Navarro, José Miguel; Allen, Michael F.; Caravaca Ballester, María Fuensanta; Roldán Garrigos, Antonio
2003-05-01

Digital.CSIC (Spain)

58

Determination of d13C of PAHs Derived from a Selection of Internationally-Traded Coals and Their Blends

Cooper, Mick; Rodríguez Vázquez, Elena; García Fernández, Roberto
2007-01-01

Digital.CSIC (Spain)

60

Climate change and coastal hydrographic response along the Atlantic Iberian margin (Tagus Prodelta and Muros Ría) during the last two millennia

Lebreiro, S. M.; Francés, G.; Abrantes, F. F. G.; Diz, P.; Bartels-Jónsdóttir, H. B.; Stroynowski, Z. N.; Gil, I. M.; Pena, L. D.; Rodrigues, T.; Jones, P. D.; Nombela, M. A.; Alejo, I.; Briffa, K. R.; Harris, I.; Grimalt, Joan O.
2006-11-01

Digital.CSIC (Spain)

62

Carbon and nitrogen translocation between seagrass ramets

Marbà, Núria; Hemminga, Marten A.; Mateo, Miguel Ángel; Duarte, Carlos M.; Mass, Yvonne E. M.; Terrados, Jorge; Gacia Pasola, Esperança
2002-01-31

Digital.CSIC (Spain)

63

Bats' Conquest of a Formidable Foraging Niche: The Myriads of Nocturnally Migrating Songbirds

Popa-Lisseanu, Ana G.; Delgado Huertas, Antonio; Forero, Manuela G.; Rodríguez, Alicia; Arlettaz, Raphaël; Ibáñez, Carlos
2007-02-14

Digital.CSIC (Spain)

64

Ancient feeding ecology and extinction of Pleistocene horses from the Pampean Region (Argentina)

Sánchez Chillón, Begoña; Prado, José L.; Alberdi Alonso, María Teresa
2006-01-01

Digital.CSIC (Spain)

65

Acid washing effect on elemental and isotopic composition of whole beach arthropods: implications for food web studies using stables isotopes

Serrano, Oscar ; Serrano, Laura ; Mateo, Miguel Angel ; Colombini, Isabella ; Chelazzi, Lorenzo ; Gagnarli, Elena

Inorganic carbon removal through acidification is a common practice prior to isotopic analysis of macroinvertebrate samples. We have experimentally tested the effect of acidification on the elemental and isotopic composition of a range of beach arthropod species. Acidification resulted in a signific...

DRIVER (Spanish)

66

Acid washing effect on elemental and isotopic composition of whole beach arthropods: implications for food web studies using stables isotopes

Serrano, Oscar; Serrano, Laura; Mateo, Miguel Ángel; Colombini, Isabella; Chelazzi, Lorenzo; Gagnarli, Elena; Fallaci, Mario
2008-06-03

Digital.CSIC (Spain)

67

Abrupt wind regime changes in the North Atlantic Ocean during the past 30,000—60,000 years

López-Martínez, Constancia; Grimalt, Joan O.; Hoogakker, Babette; Gruetzner, Jens; Vautravers, Maryline J.; McCave, I. Nicholas
2006-12-15

Digital.CSIC (Spain)