Sample records for MODELO STRETCH (stretch model)
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1

Vibrational quenching of CO2(010) by collisions with O(3P) at thermal energies: A quantum-mechanical study

Lara Castells, M. Pilar de; Hernández, Marta I.; Delgado Barrio, Gerardo; Villarreal, Pablo; López-Puertas, Manuel
2006-04-24

Digital.CSIC (Spain)

2

Using altimetry to help explain patchy changes in hydrographic carbon measurements

Rodgers, Keith B.; Key, Robert M.; Gnanadesikan, Anand; Sarmiento, Jorge L.; Aumont, Olivier; Bopp, Laurent; Doney, Scott C.; Dunne, John P; Glover, David M.; Ishida, Akio; Ishii, Masao; Jakobson, Andrew R.; Lo Monaco, Claire; Maier-Reimer, Ernst; Mercier, Herlé; Metzl, Nicolas; Pérez, Fiz F.; Ríos, Aida F.; Wanninkhof, Rik; Wetzel, Patrick; Winn, Christopher D.; Yamanaka, Yasuhiro
2010-01-01

Digital.CSIC (Spain)

3

The relationship between nonexponential relaxation and molecular stiffness in aromatic model compounds

Privalko, V. P.; Ezquerra Sanz, Tiberio A.; Zolotukhin, M.; Baltá Calleja, Francisco José; Nequlqueo, G.; García, C.; Campa, José G. de la; Abajo González, Javier de
2000-03-01

Digital.CSIC (Spain)

4

TempoExpress: An Expressivity-Preserving Musical Tempo Transformation

Grachten, Maarten; Arcos, Josep Ll.; Lopez de Mantaras, Ramon
2006-01-01

Digital.CSIC (Spain)

6

Species clustering in competitive Lotka-Volterra models

Pigolotti, Simone; López, Cristóbal; Hernández-García, Emilio
2007-06-18

Digital.CSIC (Spain)

7

Rocas graníticas pérmicas en la Sierra Pinta, NW de Sonora, México: Magmatismo de subducción asociado al inicio del margen continental activo del SW de Norteamérica/ Permiam granitic rocks in the Sierra Pinta, NW Sonora, Mexico: Subduction magmatism associated to the onset of the active continental margin of southwestern North America

Arvizu, Harim E.; Iriondo, Alexander; Izaguirre, Aldo; Chávez-Cabello, Gabriel; Kamenov, George D.; Solís-Pichardo, Gabriela; Foster, David A.; Lozano-Santa Cruz, Rufino
2009-12-01

Resumen en español Estudios geológicos multidisciplinarios realizados en rocas cartografiadas en el área de Sierra Pinta, en el NW de Sonora, que incluyeron geocronología U-Pb en zircones, estudios isotópicos de Sm-Nd en roca total y geoquímica de elementos mayores, traza y tierras raras, han permitido un precisa caracterización de rocas graníticas pérmicas. Los datos muestran la existencia de rocas pérmicas con edades U-Pb en zircones entre ~275 y ~258 Ma y valores iniciales de é (mas) psilon Nd de -19.2 a -10.4 (edades modelo Nd T DM entre 2.5 y 1.6 Ga). Estos datos, junto con los estudios geoquímicos, indican fusión de basamento cortical proterozoico relacionada a los estadios iniciales de la subducción que propició el establecimiento de un arco magmático continental en el SW de Norteamérica. Probablemente este pulso magmático es parte de un gran evento a nivel cordillerano que se extiende desde el SW de los EE. UU. pasando por Sonora, Chihuahua y Coahuila hasta el centro y sur de México, y quizás hasta el norte de Sudamérica (específicamente Colombia). La ocurrencia de estas rocas graníticas pérmicas en la Sierra Pinta podría asociarse a una zona de debilidad cortical formada por una franja angosta de basamento paleoproterozoico Yavapai, como el encontrado en algunos lugares del NW de Sonora, que sirvió para que los primeros magmas generados por subducción ascendieran con mayor facilidad hacia la superficie. Resumen en inglés Multidisciplinary studies in the Sierra Pinta area in NW Sonora, including U-Pb zircon geochronology, mayor and trace element geochemistry as well as Sm-Nd isotopic studies have allowed a precise characterization of Permian granitic rocks. The results suggest the existence of a suite of Permian granitoids with U-Pb zircon ages between ~275 y ~258 Ma. Initial epsilon Nd values between -19.2 and -10.4 and corresponding Nd model ages (T DM) between 2.5 and 1.6 Ga, as well as (mas) some geochemical characteristics, indicate melting of Proterozoic crustal basement associated to the early stages of subduction forming the continental magmatic arc of SW North America. It is likely that this Permian magmatic pulse in NW Sonora was part of a larger event in the American Cordillera extending from western-southwestern USA, passing through northern Mexico and up to central and southern Mexico and, perhaps, to northern South America (i.e., Colombia). We suggest that the occurrence of the Permian granitoids in Sierra Pinta is associated with a Paleoproterozoic crustal weakness zone formed by a narrow stretch of the Yavapai crustal province. This weakness zone could have acted as a channel-way that facilitated the ascent towards higher crustal levels of the first magmas generated by subduction.

Scientific Electronic Library Online (Spanish)

10

Raman spectra of (He)N-Br2(X) clusters: The role of boson/fermion statistics in a quantum solvent

López Durán, David; Lara Castells, M. Pilar de; Delgado Barrio, Gerardo; Villarreal, Pablo; Paola, C. Di.; Gianturco, Franco Antonio; Jellinek, J.
2004-08-15

Digital.CSIC (Spain)

11

Perturbations induced by synthetic peptides from hepatitis G virus structural proteins in lipid model membranes: a fluorescent approach

Larios, Cristina; Casas, Jordi; Mestres, Concepció; Haro Villar, Isabel; Alsina, M. Asunción
2005-08-31

Digital.CSIC (Spain)

12

Percepción de clima social familiar y actitudes ante situaciones de agravio en la adolescencia tardía/ The family social enviroment perception and attitudes on offensive circumstances in later adolescence

Vargas Rubilar, Jael Alejandra
2009-12-01

Resumen en español El propósito de este trabajo fue evaluar la posible incidencia que ejerce la percepción del clima social familiar sobre las actitudes ante situaciones de agravio en otros ámbitos. Con este fin, fueron estudiados a través de un diseño de investigación ex post facto, 140 sujetos de ambos sexos de 18 a 24 años de edad, residentes en las provincias de Entre Ríos y Mendoza (República Argentina). Los instrumentos empleados fueron la adaptación de la Escala de Clima So (mas) cial Familiar (FES) de Fernández Ballesteros (1995), el Cuestionario de Actitudes ante Situaciones de Agravio (Moreno & Pereyra, 2000) y un cuestionario demográfico para recabar variables como edad, sexo y estado civil, entre otras. Los da tos fueron analizados con Análisis de Variancia Múltiple (MANOVA). Los resultados del estudio indican que se encontraron diferencias significativas con respecto a las actitudes Venganza y Perdón entre los grupos que presentaron diferente clima familiar. Los que percibieron un clima menos favorable mostraron más predisposición a la Venganza y menos tendencia al Perdón ante la ofensa, en los ámbitos de trabajo, amistad, padres y Dios. Las actitudes ante el agravio más agresivas se vieron afectadas por la percepción negativa del clima familiar. Las actitudes prosociales se relacionaron con un ambiente más favorable. Los resultados obtenidos parecen estar de acuerdo con el modelo complementario, que plantea que las relaciones familiares proporcionan un aprendizaje de valores y habilidades básicas para la interacción con los demás en otros ámbitos. Resumen en inglés The purpose of this work was to evaluate the possible impact that the family social environment perception has on one's attitude when facing offensive situations in other environments. To this end, through an ex post facto investigation, 140 subjects of both sexes between the ages of 18 and 24, homogeneous by gender (70 men and 70 women) were studied. These subjects were residents in provinces of Entre Ríos and Mendoza (República Argentina). Throughout its existence, th (mas) e individual is heavily influenced by their environment. This assertion has been supported by authors in the fields of Psychology and Educational Psychology (Bowbly, Winnicot, and others). Also, how to perceive the environment influences how the individual behavior in that environment. Then accordingly, the objective of this research was to determine whether a better social environment for families (greater cohesion and expressiveness and less conflict) is associat ed with a more prosocial attitude to the offense, from a psychological point of view, in the late adolescence. The evaluation methods applied were: The Family Social Environment Scale from Moos, R., Moos, B., and Trickett a dapted by Fernández Ballesteros (1995). To evaluate the family environment of the participants used the Dimension Relationship: describes the relationships between family members, aspects of development that are most important in it and its basic structure. The Attitudes on Offensive Circumstances Questionnaire (Moreno & Pereyra, 2000) and a demographic survey. In analyzing the data, Multiple Analysis of Variance (MANOVA) was conducted. The results of the study showed significant differences in consideration of attitudes towards Revenge and Forgiveness in the groups with different familiar environment. Those who perceived a less favorable atmosphere demonstrated a greater predisposition towards Revenge and less towards Pardon when faced with offensive situations in their work environment, friendships, with their parents and with God. The attitudes facing more aggressive offenses were seen to be affected by the negative perception of the familiar atmosphere. The prosocial attitudes were connected to a more favorable atmosphere. The subjects of the sample that perceived less cohesion and expressiveness were more predisposed to aggressive answers and less to the forgiveness before the damage that those who were perceiving more cohesion at home. As well as those who were perceived less expressiveness showed to have more predisposition to the revenge before the offense that those who perceived more expressiveness in the family. The results showed in the areas of relationships observed, that the late adolescents with better family environment stretch to attitudes on the offense in the relations with the parents, God, the friends and his mate of job. The young of the less positive family environment showed predisposition to answers, such of more aggressive type, as the revenge before the offense in the relations with the parents, God and mate of job and a trend to the rancor in the relationship with friends. Some skills can be learned in other areas of relationships and, in turn, encourage them to a better family atmosphere, that is, more cohesive, more expressiveness and less conflict within the home. However, family relationships have a longer period and learning that makes them often have more impact than that acquired from other areas of relationship (Martínez & Fuertes, 1999). Finally, the results found in the present study seem to be more in accordance with the complementary model of Gold and Yanof (1985, cited in Martínez, 1997), that poses that the familiar relations provide a learning of values and basic skills for the interaction with others and no so much with the compensate model as which the relations with the equal would see intensified when the familiar environment and relations are poor (Fuligni & Eccles, 1993, cited in Martínez, 1997; Martínez, 1997).

Scientific Electronic Library Online (Spanish)

14

Mixing structures in the Mediterranean Sea from Finite-Size Lyapunov Exponents

d'Ovidio, Francesco; Fernández, Vicente; Hernández-García, Emilio; López, Cristóbal
2004-09-02

Digital.CSIC (Spain)

15

Mass and nutrient fluxes around Sedlo Seamount

Machín, Francisco; Pelegrí, Josep Lluís; Emelianov, Mikhail; Isern-Fontanet, Jordi; White, Martin; Bashmachnikov, Igor; Mohn, Christian
2009-12-01

Digital.CSIC (Spain)

16

Influence of leather stretching to gain area yield on its stress-relaxation behavior

Manich, Albert M.; Castellar Bertrán, María Dolors; González, Berania; Ussman, M.; Marsal, Agustí
2006-09-28

Digital.CSIC (Spain)

18

Exact, Born–Oppenheimer, and quantum-chemistry-like calculations in helium clusters doped with light molecules: The He2N2(X) system

Roncero, Octavio; Lara Castells, M. Pilar de; Delgado Barrio, Gerardo; Villarreal, Pablo; Stoecklin, T.; Voronin, A.; Rayez, J. C.
2008-04-29

Digital.CSIC (Spain)

19

Exact and quantum chemistry-like calculations in helium doped clusters: The He2Br2(X) example

Roncero, Octavio; Pérez de Tudela, Ricardo; Lara Castells, M. Pilar de; Prosmiti, Rita; Delgado Barrio, Gerardo; Villarreal, Pablo
2007-05-09

Digital.CSIC (Spain)

20

Bioeconomic simulation analysis of hake and red mullet fishery in the Gulf of Saronikos (Greece)

Anastopoulou, Ioanna; Merino, Gorka; Karlou-Riga, Constantina; Maynou, Francesc; Lleonart, Jordi
2007-01-01

Digital.CSIC (Spain)

21

Análisis Estratigráfico Secuencial de las Formaciones Huincul y Lisandro del Subgrupo Río Limay (Grupo Neuquén - Cretácico Tardío) en el Departamento El Cuy, Río Negro, Argentina

Sánchez, M. L.; Rossi, J; Morra, S; Armas, P
2008-07-01

Resumen en español Se estudió una sucesión sedimentaria que aflora en el sudeste de la Cuenca Neuquina, en el departamento El Cuy (Río Negro). La misma incluye a las formaciones Huincul y Lisandro que integran el Subgrupo Río Limay (Grupo Neuquén), y han sido asignadas al Cenomaniano- Turoniano. Se identificaron once litofacies de origen fluvial, tres litofacies de naturaleza eólica y dos litofacies volcaniclásticas. A partir de los agrupamientos en unidades genéticamente relacionad (mas) as se definieron siete elementos fluviales de intracanal, cuatro de planicie de inundación y cuatro eólicos. La distribución espacial y relaciones entre los elementos arquitecturales ha permitido reconocer sistemas fluviales agradantes de alta sinuosidad (SF-I y II), un sistema de abanico terminal (SAT) y campos de médanos barjanoides (SE). El análisis estratigráfico-secuencial permitió definir cinco Secuencias a partir de las relaciones espaciales y temporales de los elementos arquitecturales mayores y de la determinación de superficies estratigráficamente significativas. La base de la Formación Huincul está representada por el SF-I, caracterizado por un sistema de alta sinuosidad, con baja relación canales/planicie de inundación y abundantes depósitos de desbordes. Este tramo de la secuencia se interpreta como el Cortejo de Alta Acomodación (AA) de la Secuencia I (S-I). El sector cuspidal de la unidad está integrado por un sistema similar pero con una alta relación canal/planicie de inundación y constituye el Cortejo de Baja Acomodación (BA) de la Secuencia II (S-II). Se propone que la depositación de la Formación Huincul tuvo lugar bajo condiciones climáticas cálidas con un régimen de estacionalidad marcado. La Formación Lisandro se inicia con depósitos de un sistema distributario proximal de abanico terminal (SAT) que representan el Cortejo AA de S-II. De aquí en adelante es notoria la recurrencia de SE, caracterizando los Cortejos BA y una sucesión desde cuenca de inundación a distributarios proximales de SAT, integrando los Cortejos AA de las secuencias S-II, III, IV y V. La unidad se depositó bajo condiciones climáticas semiáridas permanentes. Las unidades estratigráficas estudiadas se consideran de carácter sinorogénico, con un control tectónico significativo en la definición del espacio de acomodación y un volcanismo principalmente activo durante la sedimentación de la Formación Huincul. La Formación Lisandro corresponde a un período de abrupto incremento en la tasa de subsidencia en la Cuenca Neuquina. Resumen en inglés In the Cuy Department, Rio Negro Province (Fig. 1), there are outcrops of the Late Cretaceous continental deposits of the Subgroup Rio Limay (Fig. 2), in virtually continuous exposures that allow detail studies and exploration of the architecture of the sedimentary bodies. This contribution presents the results of the sedimentological study and sequential stratigraphic analysis for the depositional period of the Huincul and Lisandro formations (Subgroup Río Limay). The o (mas) utcrops appear in the Planicie de Rentaría (Area A), with continuous sections longer than 3 km and Anfiteatro (Area B) with outcrops of more than 5 km (Fig. 1). In these areas we made detailed sedimentological profiles (Fig. 3), we described and interpreted lithofacies and architectural elements employing photograms and we defined stratigraphicaly significant discontinuities. We identified 11 fluvial lithofacies, 4 conglomerates (Gm, Gh, Gp and Gt), 5 sandstones (Sm, St., Sp, and Mr. Sh), and 2 pelitic (Fl and Fm), according to the nomenclature of Miall (1996). In addition, 2 volcaniclastic lithofacies, 1 primary pyroclastic lithofacies (Tlpm) and 1 volcaniclastic sineruptive lithofacies (TLpe) following criteria Mc Phie et al. (1993) were defined, and finally 3 eolic lithofacies (Spe, She and Sathya) (Fig. 4). These were grouped into 11 fluvial architectural elements and 4 eolic (Fig. 5). We have recognized channel elements (CHI) and CHII), intrachannel (LA, DAI, DAII, SBI and SBII) and floodplain (CRI, CRII, CS and OF). The eolic architectural elements include dunes (ED) and interdunes (DI, and WI FI). The paleoenvironments sedimentary include river systems, terminal fans and dune fields. The Sistema Fluvial I (SF-I) is integrated by LA, DAI, DAII, SBI, CHI, CRI, CRII and OF (Fig. 6). The meanders loops show, in most cases, complete filling sequences in which records of migration of large sand dunes are preserved which retain topsets deposits and the scrolls their undulating tops. The channel belts are separated by potent floodplain deposits, with frequent intercalation of levels of overflow both channelized or in mantle, and show a multilateral persistence in potent sections of the column. The crevasse splay exhibits paleosoils with low levels of development, frequent presence of gleyzed horizons and high degree of bioturbation. The general characteristics of the S-FI are proper of aggrading fluvial systems of high sinuosity. The Sistema Fluvial II (SF-II) is characterized by LA, DAI, DAII, SBI and to a lesser proportion, by CRI and OF (Fig. 6). The meanders loops often show preservation of the channel fill by lateral accretion with complete successions. Also the dunes preserve topsets deposits and the scrolls the original topography (Fig. 7). The frequency of conservation of filling phase of the abandoned channel with strong bioturbation and development gleyzed horizons suggests frequent avulsion by strangulation. The preservation of the floodplain is low, and it is characterized by intense bioturbation, and a high volcaniclastic participation in some reaches. We consider that the fluvial system model is of high sinuosity highly aggrading. The terminal fan system (Sistema Abanico Terminal) (TSS), characteristic of semiarid regions with strong seasonal climatology, is represented by CHII, CS or SBII and OF (Fig. 6). These constitute flooding basin deposits (CI), simple multiepisodic channel fillings corresponding to middle sections of the distributary plain and simple channels with development of small transversal cross bars and multilateral relations of distal distributary plain. The aeolian system (Sistema Eolico) (IS) consists of SD, DI, WD and FD. The spatial distribution of dunes and interdunes, the high dispersion of paleocurrents with a principal mode at the avalanche deposits and multiple stabilization surfaces suggest the development of a field of barchan dunes. In the element WI, we identified ferric and mottled halos and bioturbations that indicate the presence of paleosoils with gleyzed horizons (Retallack, 1976, 1990) which and characterize environments with good oxygenation. According to the temporal and spatial arrangement of the different paleoenvironments, their evolutionary trend and the analysis of significant discontinuity surfaces, we produced the stratigraphic sequence for the Subgroup Rio Limay (Fig. 8). The sequence starts with the Secuencia I, corresponding to the base of the Huincul Fm and is represented by SF-I, defined by belts of potent channels, isolated in floodplain deposits and with the development of overflow fans under conditions of rapid aggradation. The avulsion by overflow crevasse splay was the control mechanism of the system. The development of composite paleosoils in distal segments of the plain indicates the existence of long periods during which the channel band remained relatively stable poitions. The incorporation of volcaniclastic materials to fluvial deposits claims a volcanic activity close in time. The geometry and continuity of the sandy bodies and its proportion in relation to the floodplain deposits suggests periods of low frequency of avulsion/subsidence rate. The large-scale architecture observed is the equivalent to a High Accommodation System Track (Cortejo) (AA) with a ratio A/S close to 1 associated with a gradual decline in the base level under conditions of high sediment supply. A net surface (Discontinuidad D-IS-IS) is the basis of the sequence II, marked by an abrupt change in the fluvial architecture river (SF-II). The mechanism of lateral migration was by strangulation and abrupt cut of the bends. Only underdeveloped paleosoils in the abandoned channel fillings and the little preservation of the floodplain deposits are recognized. The stacking of channel belts signs out a reduction in the accommodation space. The top layer of Huincul Fm is interpreted as Lower Accommodation System Track (Cortejo) (BA). The Discontinuity IIC (D-IIC) marks the base of Lisandro Fm, which is an surface of fluvial flooding defining the expansion of a terminal fan system associated with an abrupt increase in the accommodation space and rapid progradation of the facies of an environment of intermediate distributary plain. This stretch of the Sequence is interpreted as the High Accommodation System Track (Cortejo) (AA) of the Sequence II (S-II) was associated with a period of high subsidence. The deposits of terminal fans are covered by a wet eolian system (IS). The change in the depositional environment marks the beginning of the Sequence III (SIII), limited at the base by D-IIIS. The development of a field of parabolic dunes associated with environments dry, wet and flooded interdune indicates a gradual rise in the water table that, eventually, was above the depositional surface generating shallow lagoons. The shortterm climatic changes related with an increase in precipitation and the relative position of the water table controlled the development stabilization surfaces and the growth and migration of aeolian forms. We identified two supersurfaces (D-IV and DV, Fig. 18) which may be assigned to periods with an increase in the supply or availability of sediment climatically conditioned. Periodically, the interdune corridors were overrun by ephemeral streams associated with the flood basin environments of SAT during flooding events. All deposits, characterized by a strong stacking of the eolian successions are interpreted as the Cortejo BA from the Sequence III. A new fluvial flood event marked by the Discontinuity VIC, is represented by facies flood basin, a distributary plain with the development of intertwined channels showing evidences of the SAT progradation. This sector is interpreted as the (Cortejo) AA System Track of S-III associated with a period of renewed subsidence. D-VIIS limits the base of the S-IV whose (Cortejo) BA System Track is similar to the previous Sequence and includes 3 supersurfaces (D-D-VIIIIX / X). The expansion of the flooding basin facies of a limited terminal fan at the base by D-XIC represents the base of the (Cortejo) AA System Track of the Sequence IV. Tabular units associated with a distal distributary plain that replaced towards the top by thick channels of low sinuosity close to the backbone of the system represent an progradation event of the SAT. The beginning of the Sequence V is marked D-XIIS associated with the development of a new SE. The architectural design of large scale is similar to that of the (Cortejos) BA System Tracks of the Sequences III and IV and includes supersurfaces D-D-XIII and XIV. Something similar occurs with the surface of fluvial flooding (D-XVC) on which we identified a prograding succession of SAT. The characteristics of the systems involved in the Lisandro Fm suggest a climate change to semi-arid conditions and low gradient in the depositional environment. The sequential stratigraphic analysis of the formations Huincul and Lisandro suggests that the deposits are sinorogénic and the different pulses of subsidence are registered in the (Cortejos) AA and BA System Tracks defined in this study.

Scientific Electronic Library Online (Spanish)

23

A comparison of the Iberian and Ebro Basins during the Permian and Triassic, eastern Spain: A quantitative subsidence modelling approach

Vargas, H.; Gaspar-Escribano, Jorge M.; López-Gómez, José; Wees, Jan-Diederik Van; Cloetingh, Sierd; Horra, Raúl de La; Arche, A.
2008-02-29

Digital.CSIC (Spain)

24

El flujo como indicador del efecto terapéutico del ácido folínico en la isquemia-reperfusión/ Capillary blood flown as an index of the therapeutic effect of folinic acid in ischemia-reperfusion syndrome

San Cristóbal, J.; Cearra, I.; Otero, B.; Martínez-Astorquiza, T.; Marín, H.; García-Alonso, I.
2007-01-01

Resumen en español Objetivo: estudio sobre reperfusión intestinal con una doble finalidad: a) valorar la utilidad de la medición del flujo capilar intestinal mediante láser-doppler para el estudio de la reperfusión intestinal; y b) comparar el efecto de las formas racémica y levo del ácido folínico en su tratamiento. Diseño experimental: modelo murino de isquemia intestinal mediante clampaje completo de la arteria mesentérica superior durante 90 minutos. Se compara la evolución de (mas) tres grupos de tratamiento: suero salino, ácido folínico y ácido levofolínico. Se analiza la evolución de parámetros bioquímicos (niveles de creatín kinasa, láctico deshidrogenasa y fosfatasa alcalina a los 60 minutos y dos y siete días de restablecer el flujo sanguíneo), flujo capilar en yeyuno e íleon mediante láser-doppler (durante isquemia y tras primera hora de reperfusión), lesión mucosa intestinal, y curva de supervivencia. Resultados: el láser-doppler permitió analizar con fiabilidad el efecto de los tratamientos sobre el flujo capilar durante reperfusión intestinal. El ácido levofolínico mejoró el flujo capilar en el íleon a partir de los 25 minutos de reperfusión, a la vez que disminuyó la lesión mucosa en el mismo tramo intestinal el séptimo día de evolución (p Resumen en inglés Objective: an intestinal reperfusion study with two aims: a) to assess the usefulness of intestinal capillary blood flow measurement by laser-Doppler for intestinal reperfusion studies; and b) to compare the effects of racemic and levo forms of folinic acid in treating the syndrome. Experimental design: a murine model of intestinal ischemia by completely clamping the superior mesenteric artery for 90 minutes. A comparison was made of three treatment groups: saline, folini (mas) c acid, and levo-folinic acid. The following factors were analyzed: changes in biochemical parameters (levels of creatine kinase, lactic dehydrogenase, and alkaline phosphatase at 60 minutes, and at two and seven days after restoring blood flow), capillary flow in the jejunum and ileum by laser-Doppler (during ischemia and after the first hour of reperfusion), intestinal mucosa injury, and survival curve. Results: laser-Doppler provided reliable data on how the different treatments affected capillary flow during intestinal reperfusion. Levo-folinic acid improved capillary flow in the ileum after 25 minutes of reperfusion, and also reduced mucosal injury in the same stretch of intestine by the seventh day post-reperfusion (p

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