Sample records for dynamic studies biological
from WorldWideScience.org

Sample records 1 - 20 shown. Select sample records:



1

Yeast population dynamics during the fermentation and biological aging of sherry wines

Esteve Zarzoso, Braulio; Peris Torán, María José; García Maiquez, E; Uruburu, Federico; Querol, Amparo
2001-05-01

Digital.CSIC (Spain)

4

The role of resting cysts in Alexandrium minutum population dynamics

Estrada, Marta; Solé, Jordi; Garcés, Esther; Anglès, Silvia
2010-02-01

Digital.CSIC (Spain)

7

Synthesis, conformation, and biological characterization of a sugar derivative of morphine that is a potent, long-lasting, and nontolerant antinociceptive

Arsequell, Gemma; Salvatella, Mariona; Valencia Parera, Gregorio; Fernández-Mayoralas, Alfonso; Fontanella, Marco; Venturi, Chiara; Jiménez-Barbero, Jesús; Marrón Fernández de Velasco, E.; Rodríguez, Raquel E.
2009-04-07

Digital.CSIC (Spain)

8

Surface mixing and biological activity in the four Eastern Boundary Upwelling Systems

Rossi, Vincent; López, Cristóbal; Hernández-García, Emilio; Sudre, Joel; Garçon, Véronique; Morel, Y.
2009-08-27

Digital.CSIC (Spain)

11

Small-scale structure of nonlinearly interacting species advected by chaotic flows

Hernández-García, Emilio; López, Cristóbal; Neufeld, Zoltan
2002-05-20

Digital.CSIC (Spain)

13

Seasonal and short-time-scale dynamics of microplankton community production and respiration in an inshore upwelling system

Moncoiffé, Gwenaëlle; Álvarez-Salgado, Xosé Antón; Figueiras, F. G.; Savidge, Graham
2000-04-01

Digital.CSIC (Spain)

14

Robust dynamical pattern formation from a multifunctional minimal genetic circuit

Rodrigo, Guillermo; Carrera, Javier; Elena, Santiago F.; Jaramillo, Alfonso
2010-04-22

Digital.CSIC (Spain)

17

Population dynamics and fishery of dolphinfish (Coryphaena hippurus) in the western Mediterranean

Morales-Nin, Beatriz; Massutí, Enric; Deudero Company, María de la Salud; Reñones, Olga; Lleonart, Jordi
1999-01-01

Digital.CSIC (Spain)

18

Plankton blooms in vortices: The role of biological and hydrodynamic time scales

Sandulescu, Mathias; López, Cristóbal; Hernández-García, Emilio; Feudel, Ulrike
2007-08-02

Digital.CSIC (Spain)

19

Physical and biological processes controlling the distribution of fish larvae in the NW Mediterranean

Sabatés, Ana; Olivar, M. Pilar; Salat, Jordi; Palomera, Isabel; Alemany, Francesc
2007-10-01

Digital.CSIC (Spain)

20

Phylogenetic conservation of the regulatory and functional properties of the Vav oncoprotein family

Couceiro, José R.; Martín-Bermudo, María D.; Bustelo, Xosé R.
2005-08-15

Digital.CSIC (Spain)

22

Pattern recognition in interdisciplinary perception and intelligence

Fernández-Caballero, Antonio; Sanfeliu Cortés, Alberto; Shirai, Yoshiaki
2008-02-08

Digital.CSIC (Spain)

24

Noise-induced inhibitory suppression of frequency-selective stochastic resonance

Tessone, Claudio J.; Ullner, E.; Zaikin, A.A.; Kurths, Jürgen; Toral, Raúl
2006-10-31

Digital.CSIC (Spain)

25

Mutagenesis of prochlorothrix plastocyanin reveals additional features in photosystem I interactions

Hervás, Manuel; Myshkin, Eugene; Vintonenko, Nadejda; Rosa, Miguel A. de la; Bullerjahn, George S.; Navarro, José A.
2003-03-07

Digital.CSIC (Spain)

26

Morphological effects of ceramide on DMPC/DHPC bicelles

Barbosa-Barros, L.; Maza, Alfons de la; Walther, P.; Estelrich, J.
2008-04-02

Digital.CSIC (Spain)

28

MHC Adaptive Divergence between Closely Related and Sympatric African Cichlids

Blais, Jonatan; Rico, Ciro; Van Oosterhout, Cock; Cable, Joanne; Turner, George F.; Bernatchez, Louis
2007-08-15

Digital.CSIC (Spain)

29

Long-term impact of acid resin waste deposits on soil quality of forest areas II. Biological indicators.

Pérez de Mora, Alfredo; Madejón, Engracia; Cabrera, Francisco; Buegger, Franz; Fuß, Roland; Pritsch, Karin; Schloter, Michael
2008-01-01

Digital.CSIC (Spain)

31

La oclusión como factor etiopatológico en los trastornos temporomandibulares/ The occlusion as an etiopathological risk factor in temporomandibular disturbance

García-Fajardo Palacios, Carlos; Cacho Casado, Alberto; Fonte Trigo, Abelardo; Pérez -Varela, Juan Carlos
2007-06-01

Resumen en español Fundamento. La relación intrínseca entre alteración oclusal y trastorno articular no es un paradigma que se cumpla siempre. Sin embargo, el análisis oclusal debe ser siempre un requisito imprescindible en la exploración del paciente disfuncional ya que multitud de estudios demuestran que puede representar un factor etiológico de primer orden. Material y método. A través de distintas revisiones bibliográficas se describen los principales estados oclusales y se int (mas) enta establecer una posible relación estructural y funcional entre los distintos cuadros articulares. Resultados. La relación entre cada tipo de maloclusión y un determinado trastorno temporomandibular (TTM), se evidencia a través de las distintas posiciones condilares en la cavidad glenoidea. Se podría hablar de una Unidad Diente-Cóndilo ya que el aparato estomatognático posee un singular bloque óseo, como es la mandíbula, que alberga en su misma estructura a dientes y cóndilo, lo que implicaría que las distintas variantes de la oclusión se trasladen de manera dinámica a la articulación. Conclusión. Aunque la implicación del factor oclusal en la etiopatología temporomandibular está condicionada por la presencia de otros factores coadyudantes, el reestablecimiento de la oclusión fisiológica puede ser primordial para reestablecer la homeostasis articular e implicaría conocer la biomecánica particular de cada paciente y su correlación con sus parámetros biológicos. Resumen en inglés Background: The relationship between occlusal discrepancies and TMJ disorders does not always hold true. Nonetheless, occlusal analysis is a requisite to achieve a correct diagnosis in the dysfunctional patient. Many studies show that occlusal discrepancies can be a very important etiological factor. Material and Methods: Various literature reviews describe the main occlusal types and the possibility of structural and functional relationships with TMJ derangements. Result (mas) s: The relationship between each kind of malocclusion and a specific TMJ disorder is due to different condyle positions in the glenoid fossa. It may be appropriate to introduce the term Tooth-Condyle Unit because the stomatognathic system has a specific bone block or mandible, which encompass teeth and condyles. The various occlusal schemes can be considered dynamic which influences the joint. Conclusion: The involvement of occlusion in the etiology of TMJ disorder is conditioned by the presence of other factors. However, physiologic occlusion must be re-established for correct joint function. This implies that the specific biomechanics of each patient and it's correlation with biological parameters must be known in order to provide joint homeostasis.

Scientific Electronic Library Online (Spanish)

32

La epigenética y los estudios en gemelos en el campo de la psiquiatría/ Epigenetics and twin studies in psychiatric domains

González Ramírez, Adriana Estrella; Díaz Martínez, Alejandro; Díaz-Anzaldúa, Adriana
2008-06-01

Resumen en español La secuencia de ADN genómico que caracteriza a nuestra especie constituye la piedra fundamental de la vida humana; parte de ella se refleja en la secuencia del ARN y a través de éste se dicta la información necesaria para que nuestras células produzcan proteínas. La genética contribuye de manera importante a los avances en el campo médico. Los descubrimientos genéticos han permitido desarrollar estrategias para modificar, prevenir y proponer nuevas terapias para (mas) diversas enfermedades. En el siglo XIX, Gregor Johann Mendel desarrolló un modelo teórico capaz de predecir la naturaleza y propiedades de los mecanismos de la herencia, que sigue siendo indispensable para explicar la base de la herencia humana. Otro suceso determinante en la historia de la Medicina se dio a conocer casi nueve décadas después cuando James Watson y Francis Crick describieron su modelo estructural para el ADN. Posteriormente se introdujeron la clonación posicional y la reacción en cadena de la polimerasa; más recientemente se publicó cerca del 99% de la secuencia del genoma humano. El período actual se conoce como la era post-genómica, ya que además de descifrar genomas completos, los investigadores pretenden, entre otras cosas, esclarecer los mecanismos que influyen en la activación e inactivación de los genes, lo cual en parte involucra un nivel epigenético. En las ciencias médicas los gemelos constituyen un grupo idóneo para abordar el estudio de las enfermedades hereditarias. En este tipo de padecimientos suelen observarse similitudes entre parientes, en especial si se trata de gemelos monocigóticos. Sin embargo, aun en este tipo de hermanos se detectan diferencias importantes. Parámetros como los grados de concordancia y porcentajes de heredabilidad han puesto de manifiesto que un gemelo monocigótico puede presentar trastornos hereditarios que su co-gemelo nunca tendrá. La epigenética es el estudio de los cambios en la función de los genes que no afectan la secuencia del ADN, por modificaciones que tienen lugar principalmente en las citosinas de éste y en las histonas de la cromatina. Se ha determinado que las modificaciones epigenéticas son mucho más frecuentes que aquellas que modifican la secuencia del ADN, por lo que constituyen uno de los fundamentos de la diversidad biológica, muestran la manera en que el ambiente puede modular la expresión genética y contribuyen así a nuestro fenotipo. Esta revisión reúne datos sobre la posible relevancia de la epigenética en el estudio de los trastornos mentales y como posible explicación parcial de las diferencias observadas entre gemelos >. Un conocimiento más profundo de los patrones epigenéticos podría contribuir a identificar factores de riesgo para estos trastornos. Resumen en inglés The sequence of the human genome integrates the keystone of our life. Part of it is transcribed to RNA, which in turn provides the information required by our cells to produce proteins. Discoveries in the genetics field have been essential to medicine and have been used to develop strategies to modify, prevent and propose new therapeutic approaches for human diseases. In the 19th Century, Gregor Johann Mendel developed a theoretical model which was able to predict in an a (mas) ccurate way hereditary mechanisms; indeed, his laws still explain the basis of human inheritance. Almost ninety years later, James Watson and Francis Crick announced their double-helix model of the DNA molecule. Then, positional cloning and the polymerase chain reaction (PCR) were introduced; more recently, almost 99% of the sequence of our genome was made public. The current period of time is known as the post-genomic era, due to the fact that researchers are not only obtaining the complete sequences of thousands of genomes, but are also searching for clues that may help understand the mechanisms that affect gene activation and deactivation, in which epigenetic factors are also involved. In medical domains, twins constitute a suitable group to study inherited disorders. Dizygotic or fraternal twins are produced by different egg and sperm cells, and even when these two fertilization events occur simultaneously, dizygotic twins share approximately the same percentage of genetic material than any pair of siblings, that is, around 50%. Some authors have suggested that the tendency for spontaneous dizygotic twinning could be attributed to a double ovulation which is genetically determined in an autosomal dominant manner. Monozygotic, as opposed to dizygotic twins, are produced by a single zygote whose cells are dissociated and originate two independent organisms; approximately a third of monozygotic twins are separated before the 5th day after fertilization, and the rest between the 5th and the 15th day. Most monozygotic twins are very similar; nevertheless, some few exceptions prove that in fact they actually do not have to be identical. Relatives of a person with a mental disorder tend to share traits associated with this disease, especially if the patient and the relative are monozygotic twins. However, important differences may be detected even between each pair of identical twins. Parameters such as concordance and heritability have shown that a monozygotic twin can develop an inherited disorder while his or her co-twin will always be disease-free. In addition to differences in susceptibility to inherited diseases, this kind of twins can display dissimilarities in somatic cell mutations (more overtly noticeable when ageing), their set of antibodies and T cell receptors, their number of mitochondrial DNA molecules, and chromosome X inactivation patterns in women, all of which are the main subject of many ongoing studies. A recent report shows that from 160 monozygotic twin pairs who were 3 to 74 years old, epigenetic patterns were identical early in life, but differences were more obvious at older ages, especially if twins were raised apart or if they had different medical history. Medical conditions, but also environmental factors such as pregnancy tobacco exposure, physical activity, and diet could contribute to differences in epigenetic patterns. It has been shown that epigenetic modifications (or epi-mutations) are more frequent than the ones that modify DNA sequence, so they are part of the fundamental causes of biological diversity, and they show how environment can modulate gene expression and contribute to our phenotype. Even when twin studies are sometimes considered purely genetic, they also give information about the influence of environmental factors. However, it is important to consider with caution the results from this type of studies. Heritability estimates are not unchangeable facts. They depend on the sample being analyzed, the genes involved in the specific sample, the characteristics of the environmental factors which members of this group were exposed to, and the precise moment the study was done. Epigenetics refers to changes that do not alter the DNA sequence but affect gene function due to chemical modifications which mainly occur in DNA cytosines and in chromatin-related histones. Epigenetic processes are covalent modifications which include the addition of functional groups (methyl, acetyl, phosphate, etc.) or proteins (ubiquitin, SUMO, etc.) to the DNA molecule or to associated proteins. These modifications contribute to the activation or inhibition of transcription, which leads to changes in messenger ARN expression that can ultimately influence the onset of disease. Pseudogenes are still being excluded while new genes are being confirmed in our genome sequence, but the current estimates indicate that each one of our nucleated cells contains almost 22000 genes (excluding mitochondrial DNA) which encode for polypeptides and more than 4,000 whose final product is RNA. Gene expression is partially controlled by DNA coiling around globular proteins called histones, which constitute a structure known as chromatin, a DNA-protein complex that represents the packaging of 3.25 billion base pairs of our genetic information. Physical and chemical chromatin modifications can also affect gene expression by changing DNA-protein interactions; in general terms, genes are inhibited when chromatin is packed and they are active when it is free. These dynamic states are controlled by epigenetic reversible modifications on DNA methylation or by changes in histones. It has been shown that subtle epigenetic differences between any two human beings are associated with dissimilar final chromatin remodeling, as well as expression/repression of genes.

Scientific Electronic Library Online (Spanish)

34

Kinematic studies of transport across an island wake, with application to the Canary islands

Sandulescu, Mathias; Hernández-García, Emilio; López, Cristóbal; Feudel, Ulrike
2006-10-01

Digital.CSIC (Spain)

35

Inherent noise can facilitate coherence in collective swarm motion

Yates, Christian A.; Erban, Radek; Escudero, Carlos; Couzin, Iain D.; Buhl, Jerome; Kevrekidis, Ioannis G.; Mainia, Philip K.; Sumpter, David J. T.
2009-03-30

Digital.CSIC (Spain)

36

Indicadores bioquímicos y pruebas isométricas en fibromialgia/ Biochemical markers and isometric tests in fibromyalgia

López Espino, Manuel; Gozalo Palomares, Adolfo; Mingote Adán, José Carlos; Borobia Fernández, César
2008-12-01

Resumen en español El síndrome fibromiálgico (SFM) es una entidad clínica bien definida de tipo sistémico cuyos síntomas y signos exploratorios son crónicos y fluctuantes, observándose la interacción de diferentes factores de riesgo y los mecanismos periféricos y centrales, así como varios factores psicosociales asociados. No se conocen completamente los mecanismos etiopatogénicos implicados del síndrome fibromiálgico. El diagnóstico es clínico y tras la exclusión de otras p (mas) atologías somáticas habitualmente se tarda demasiado tiempo para diagnosticar y tratar a las personas afectadas. Los estudios realizados se han orientado a analizar la existencia de lesiones musculares, alteraciones en el sistema inmunológico, anomalías psicológicas, problemas hormonales, trastornos del sueño, niveles bajos de algunas sustancias importantes en el sistema nervioso, pero en la actualidad no existe un test específico para poder realizar su diagnóstico preciso. En este trabajo adaptamos dos instrumentos de evaluación diagnóstica que son los indicadores bioquímicos y la isometría muscular, biomarcadores objetivos de diagnóstico que confirmen el SFM. Como enfermedad psicosomático y no como trastorno somatoforme. Nuestro estudio se planteó como un análisis prospectivo de un colectivo de 26 pacientes del género femenino con fibromialgia y una muestra poblacional de referencia que aceptaron ser sometidos a una serie de pruebas isométricas y a la obtención de muestras biológicas para medir un perfil bioquímico de estrés. Resumen en inglés Fibromyalgia is a well defined clinic entity which systemic symptoms and signs are chronic and fluctuating, in which we can see the interaction of different s etiopathogenic mechanisms, and associated psychosocial factors as well. There are not completely known the implicated etiopatogenic mechanisms. The diagnostic process is clinic and it usually takes too much time to diagnose and to treat people affected. In spite of numerous studies, but actually it does not exist an (mas) y specific test for a precise differential diagnostic. In this study we adapt two evaluation instruments, which are biological markers and muscular, in order to confirm the SFM as psychosomatic illness, and not as somatoforme disorder. Our study was planned as a prospective analysis of 26 female patients affected by fibromyalgia and a random sample that accepted being studied, in order to measure the biological profile of stress and isometric and dynamic performances (Isostation B- 200) in fibromyalgic patiens and control group.

Scientific Electronic Library Online (Spanish)

37

Ideación suicida en población escolarizada infantil: factores psicológicos asociados/ Suicidal ideation among school children population: psycological factors associated

Miranda de la Torre, Ixchel; Cubillas Rodríguez, María José; Román Pérez, Rosario; Abril Valdez, Elba
2009-12-01

Resumen en español El suicidio es un problema de salud pública y un fenómeno social que incide sobre el desarrollo humano. A partir de la década de 1970 se observan en nuestro país suicidios en el grupo de infantes y escolares en el rango de edad de cinco a 14 años. Las lesiones autoinfligidas se ubican en el octavo lugar de las causas de defunciones para este grupo etáreo. El comportamiento suicida es un proceso de varias etapas. La primera es la ideación suicida que se refiere a lo (mas) s pensamientos en torno a la propia muerte y es de vital importancia como factor predictor para llegar al suicidio consumado. Aunque existe alguna investigación sobre el tema, ésta es escasa en población menor de 14 años. De ahí que en el presente estudio el objetivo es analizar los factores psicológicos en niños y niñas de 10 a 13 años, a fin de identificar aquellos asociados con la ideación suicida. Material y métodos El estudio fue descriptivo de tipo comparativo, observacional, transversal. Participantes: 631 estudiantes de quinto y sexto de primaria, varones y mujeres con edades de 10 a 13 años, de la ciudad de Hermosillo, Sonora. Instrumentos: Cuestionario en formato autoaplicado con las siguientes escalas: Children's Depresion Inventory CDI, escala de ansiedad manifiesta en niños CMAS-R y el inventario de autoestima de Coopersmith. Procedimiento: Se aplicó la primera parte del cuestionario a 631 niños, posteriormente se trabajó con una submuestra de dos grupos iguales: Uno identificado con ideación suicida (174) y el otro sin ideación (174), a los que se les aplicó la segunda parte del cuestionario. Análisis de datos: Se utilizó la prueba no paramétrica χ² y razón de prevalencias del paquete estadístico SPSS. Resultados La media de edad fue de 10.9 años, la variable sexo quedó a su vez distribuida en 50.8% niñas y 49.2% niños, el 72.1% de ellos en escuelas públicas y 27.9% en escuelas privadas, semejante a la proporción de la matrícula de educación primaria para los grupos de quinto y sexto grados. El 29.2% de los niños y niñas manifestó ideas suicidas. Depresión: El grupo de niños con ideación suicida presentó mayores estados depresivos en comparación con el grupo sin ideación (p Resumen en inglés Nowadays, suicide is a public health problem and a social phenomenon that affects human development. From 1995 to 2002, the state of Sonora showed a 3.8% annual average increase in the occurrence of suicide in productive age population, occupying the national third place with regard to this problem's growth. During the 1970's suicide in groups of infants and school children between 5 and 14 years old started to be noticed in the country. At present time, self-inflicted in (mas) juries are eighth cause of death for this age group. Suicidal behavior is a process comprised by several stages: passive suicidal ideation, active contemplation of suicide itself, planning and preparation, suicide attempt execution, and completed suicide. Since these stages may or not be sequential, it is important to study the steps preceding suicides, such as the ideation and the attempt, in order to know and treat this problem. The suicidal ideation is a very important stage as predictive factor to approach the completed suicide and refers to the thoughts regarding one's own death, which may or not be verbalized. There is little research about this subject matter particularly in regards to population under 14; hence, in this study, psychological factors of a sample comprised by boys and girls between 10 and 12 from public and private schools from the State of Sonora will be analyzed and compared to identify those children associated with suicidal ideation and advance in the understanding of this complex phenomenon. Material and methods The study was descriptive-comparative, observational, and transversal in nature. Sample: 631 elementary school fifth and sixth grader students, both genders, aged between 10 to 13 years, from 16 public schools and four private schools in Hermosillo, Sonora. A 631 student sample was considered through clusters connecting the entire schools within the city and the number of students enrolled in the school term. Instruments: A self applied form questionnaire, which evaluates socio-demographic data, was used with the following scales: Children's Depression Inventory CDI; Children's Manifest Anxiety Scale CMAS-R (revised); Self Esteem Inventory. Procedure: In order to carry out this research, authorization was requested to the Ministry of Education of Sonora. In a first phase during an academic hour, a self-applied form questionnaire with socio-demographic information and the depression scale was given. Subsequently, the second part of the questionnaire was given to a sub-sample of two equal groups, one of them identified with suicidal ideation and the other one without ideation. Data analysis: The statistical analyses were performed using the program SPSS version 15.0. Non-parametric test χ² (Chi Square) and prevalence ratio (odds ratio) were used. Results A total of 631 boys and girls were evaluated with the depression questionnaire during the first phase. The mean age was 1 0.9 years (range: 10-13 years), the gender variable was distributed 50.8% girls and 49.2% boys, as a result of the registration rate for fifth and sixth grades of elementary education; 72.1% of the children were in public schools and 27.9% in private schools. In accordance to answers of CDI item 9, children who marked these two possible answers: > (18.1%) and > (11.1%) were considered with suicidal ideation. This scale evaluated how the children felt during the two weeks previous to taking the questionnaire and 29.2% of the children somehow showed suicidal ideas. The sub-sample defined from the total population was distributed into two groups: one control group with 184 children without suicidal ideation and another group with 184 children with suicidal ideation. Depression: In regard to depression, results showed that group with suicidal ideation presented greater depressive states compared to the group without suicidal ideation (p

Scientific Electronic Library Online (Spanish)

38

Glycosyl Inositol Derivatives Related to Inositolphosphoglycan Mediators: Synthesis, Structure, and Biological Activity

Dietrich, Hansjörg; Espinosa, Juan Félix; Chiara, José Luis; Jiménez-Barbero, Jesús; León, Yolanda; Varela-Nieto, Isabel; Mato, José M.; Cano, Félix H.; Foces-Foces, Concepción; Martín Lomas, Manuel
1999-01-01

Digital.CSIC (Spain)

39

Functional, fractal nonlinear response with application to rate processes with memory, allometry, and population genetics

Vlad, Marcel O.; Morán, Federico; Popa, Vlad T.; Szedlacsek, Stefan E.; Ross, John
2007-03-14

Digital.CSIC (Spain)

41

Fauna Mammalia asociada a los focos de leishmaniasis neotropical: Situación en Venezuela/ Mammalia fauna associated to foci of neotropical leishmaniasis: Situation in Venezuela

Reyes, Adriana; Arrivillaga, Jazzmin
2009-07-01

Resumen en español La fauna potencial de hospedadores-reservorios de Leishmania en Venezuela es poco conocida. La elaboración de listado de mamíferos señalados como infectados en el neotrópico, puede servir de base para la creación de mapas de distribución de hospedadores vertebrados potenciales en Venezuela. Se ha demostrado que los roedores son los hospedadores naturales más frecuentes de la Leishmania en la región neotropical, lo cual es una evidencia biológica para considerar a (mas) los modelos murinos como ideales en estudios in vivo de la leishmaniasis. Los inventarios faunísticos en estudios de leishmaniasis, indican que las familias Echimyidae, Cricetidae y Muridae son las más representativas. Para Venezuela, algunas especies de los géneros Oryzomys, Heteromys, Proechimys y Rattus se citan como infectadas, sin embargo, especies de Xenarthras, Didelphidae y carnívoros silvestres, aunque no han sido señalados infectados con Leishmania en el país, tienen una importancia epidemiológica potencial, basado en su capacidad de hospedador susceptible, ecología, y distribución geográfica concordante con focos de leishmaniasis. La asociación de estos mamíferos como posibles hospedadores-reservorios, con la presencia de Leishmania y con vectores infectados debería ser explicada con base en la dinámica poblacional y ecología de estos eslabones, y de la enfermedad. No obstante, los estudios parasitológicos de reservorios se fundamentan solo en búsqueda de infección natural, y no en explicar su rol en el ciclo de transmisión. Estudios de ecología de poblaciones de mamíferos, deben ser obligatorios en áreas leishmaniasis, para la comprensión de la dinámica epidemiológica y en especial para el diseño estrategias multidisciplinarias más efectivas para el manejo de la enfermedad. Resumen en inglés The potential host-reservoir fauna for Leishmania in Venezuela is not well known. The infected mammals checklist for the neotropical region, can be useful as base of design of distribution maps for potential hosts in Venezuela. Rodents are the most important hosts for Leishmania in the neotropics, which is a biological evidence for the use of murine models for in vivo studies in leishmaniasis. The animal surveys in leishmaniasis studies have shown that the families Echimy (mas) idae, Cricetidae and Muridae are the most representative hosts. In Venezuela, species belonging to Oryzomys, Heteromys, Proechimys and Rattus genera have been reported as infected by Leishmania. However, species of Xenarthra, Didelphydae and wild carnivores have not been reported infected, and these are potentially epidemiological important, based on their susceptible host capacity, their ecology and the congruent geographical distribution with leishmaniasis foci. The association of these mammals as potential hosts-reservoirs with the occurrence of Leishmania and also with the infected vectors must be explained based on the population dynamics and ecology of these links and the disease. Nevertheless, the parasitological studies on reservoirs are supported in the search of natural infection only, without finding their role in the transmission cycle. Population ecology studies in mammals must be mandatory in leishmaniasis areas, in order to understand the epidemiological dynamic and especially to design more effectives multidisciplinary strategies for the disease management.

Scientific Electronic Library Online (Spanish)

43

Episodic meteorological and nutrient-load events as drivers of coastal planktonic ecosystem dynamics: a time-series analysis

Guadayol, Òscar; Peters, Francesc; Marrasé, Cèlia; Gasol, Josep M.; Roldán, Cristina; Berdalet, Elisa; Massana, Ramon; Sabata, Anna
2009-04-17

Digital.CSIC (Spain)

45

Enrichment of organochlorine contaminants in the sea surface microlayer: An organic carbon-driven process

García-Flor, Nuria; Guitart, Carlos; Ábalos, Manuela; Dachs, Jordi; Bayona Termens, Josep María; Albaigés Riera, Joan
2005-06-01

Digital.CSIC (Spain)

46

Effects of small-scale turbulence on the growth of two diatoms of different size in a phosphorus-limited medium

Peters, Francesc; Arin, Laura; Marrasé, Cèlia; Berdalet, Elisa; Sala, M. Montserrat
2006-03-03

Digital.CSIC (Spain)

47

Effects of Matrix Heterogeneity on Animal Dispersal: From Individual Behavior to Metapopulation-Level Parameters

Revilla, Eloy; Wiegand, Thorsten; Palomares, Francisco; Ferreras, Pablo; Delibes Mateos, Miguel
2004-09-22

Digital.CSIC (Spain)

49

Dynamics at an elongated, intermediate depth seamount in the North Atlantic (Sedlo Seamount, 40°20′N, 26°40′W)

Mohn, Christian; White, Martin; Bashmachnikov, Igor; Jose, Felix; Pelegrí, Josep Lluís
2009-12-01

Digital.CSIC (Spain)

53

Comparative study of mixing and biological activity of the Benguela and Canary upwelling systems

Rossi, Vincent; López, Cristóbal; Sudre, J.; Hernández-García, Emilio; Garçon, V.
2008-06-07

Digital.CSIC (Spain)

54

Colloquium on diatom-copepod interactions

Paffenhöfer, G. A.; Ianora, A.; Miralto, A.; Turner, J. T.; Kleppel, G. S.; Ribera d'Alcalà, M.; Casotti, R.; Caldwell, G. S.; Pohnert, G.; Fontana, A.; Müller-Navarra, D.; Jónasdóttir, S.; Armbrust, V.; Bamstedt, U.; Ban, S.; Bentley, M. G.; Boersma, M.; Bundy, M.; Buttino, I.; Calbet, Albert; Carlotti, F.; Carotenuto, Y.; d'Ippolito, G.; Frost, B.; Guisande, C.; Lampert, W.; Lee, R. F.; Mazza, S.; Mazzocchi, M. G.; Nejstgaard, J. C.; Poulet, S. A.; Romano, G.; Smetacek, V.; Uye, S.; Wakeham, S.; Watson, S.; Wichard, T.
2005-02-02

Digital.CSIC (Spain)

55

Children's Gestures from 18 to 30 months

Andrén, Mats

This thesis concerns the nature of the gestures performed by five Swedish children. The children are followed from 18 to 30 months of age: an age range which is characterized by a rapid succession of developmental changes in children's abilities to communicate by means of both spoken language and ge...

DRIVER (Spanish)

56

Buying Years to Extinction: Is Compensatory Mitigation for Marine Bycatch a Sufficient Conservation Measure for Long-Lived Seabirds?

Igual, José Manuel; Tavecchia, Giacomo; Jenouvrier, Stephanie; Forero, Manuela G.; Oro, Daniel
2009-03-12

Digital.CSIC (Spain)

57

Butt coupled microcantilever in sensing applications

Zinoviev, Kirill; Plaza, José Antonio; Cadarso Busto, Víctor Javier; Lechuga, Laura M.; Domínguez, Carlos
2006-04-21

Digital.CSIC (Spain)

58

Birth, death and diffusion of interacting particles

Hernández-García, Emilio; López, Cristóbal
2005-11-25

Digital.CSIC (Spain)

59

Biology of the planktonic stages of benthic octopuses

Villanueva, Roger; Norman, Mark D.
2008-01-01

Digital.CSIC (Spain)

60

Biological control of harmful algal blooms: A modelling study

Solé, Jordi; Estrada, Marta; Garcia-Ladona, Emilio
2006-07-01

Digital.CSIC (Spain)

61

Biological activity in the wake of an island close to a coastal upwelling

Sandulescu, Mathias; López, Cristóbal; Hernández-García, Emilio; Feudel, Ulrike
2008-09-01

Digital.CSIC (Spain)

62

Análisis de fuentes y toxicidad equivalente de sedimentos contaminados con PAHs en el estuario de Bahía Blanca, Argentina/ Sources analysis and equivalent toxicity assessment of PAHs impacted sediments in Bahia Blanca Estuary, Argentina

Arias, Andrés H.; Marcovecchio, Jorge E.; Freije, Rubén H.; Ponce-Velez, Guadalupe; Vázquez Botello, Alfonso
2010-04-01

Resumen en español Se presenta un estudio exhaustivo de sedimentos del estuario de Bahía Blanca (Argentina) para determinar su impacto por Hidrocarburos Aromáticos Policíclicos (PAHs). Los sedimentos fueron procesados siguiendo protocolos de la Environmental Protection Agency (EPA, USA) y analizados por Cromatografía Gaseosa-Espectrometría de Masas, hallándose un rango de concentraciones total, desde 103 a más de 2,000 ng.g-1 p.s. (p.s.= peso seco; Total PAHs = sumatoria de 17 PAHs), (mas) una concentración media de 527 ± 114 ng.g-1 y una mediana de 507 ng.g-1. Se demostró la existencia de un nivel dinámico de contaminación por PAHs, definido por valores bajos a moderados que incluyeron zonas puntuales con altos niveles. El análisis de origen mediante el uso de índices moleculares determinó un predominio de deposiciones pirolíticas sobre las de origen petrogénico, siendo dominantes las emisiones provenientes de la quema de biomasa durante los meses más cálidos. La calidad ecotoxicológica de los sedimentos se abordó utilizando el enfoque de niveles guía, hallándose para la mayoría de los sitios muestreados una predicción de efectos adversos infrecuentes sobre la biota adyacente, con sitios puntuales para los cuales se predijo la aparición frecuente de efectos. Utilizando el concepto de equivalentes de Benzo-a-pireno se calculó su carga total, la cual se halló en ocasiones por sobre los valores indicados en diversas regulaciones internacionales. Finalmente se evaluó la dosis carcinogénica aportada por los 7 PAHs carcinogénicos y su perfil de concentraciones se contrastó estadísticamente con otros sitios costeros del mundo utilizando análisis de grupos jerarquizados. Resumen en inglés This paper presents a comprehensive survey of PAHs in coastal sediments of Bahia Blanca, Argentina and provides useful information of their levels of concentration, sources, ecotoxicological assessment and carcinogenic PAHs profile of local emissions. Sediments were analyzed following Environmental Protection Agency (EPA, USA) protocols by means of Gas Chromatography-Mass Spectrometry, showing total concentrations of PAHs in a range from 103 to more than 2,000 ng.g-1 (mea (mas) n: 527 ± 114 ng.g-1; median: 507 ng.g-1). A dynamic state of PAHs pollution was demonstrated for the area which was defined by widespread low to moderate levels, but including punctual zones with high pollution processes. Molecular ratios calculations determined a generalized overimposition of pyrolitic PAHs over the petrogenic input. The pyrolitic pattern moved to a biomass burning origin during summer, the period of highest recorded fires. In addition, the ecotoxicological guidelines approach for PAHs chemical concentrations in sediment defined a rare occurrence of biological effects for the majority of sampled sites; however, frequent effects were expected for punctual locations. Further, Total Benzo-a-pyrene equivalents from several sampling stations were found to be above international regulations. Finally, the PAHs carcinogenic dose was calculated using the BaP equivalent factors approach and compared with other worldwide coastal studies by means of Hierarchical Cluster Analysis.

Scientific Electronic Library Online (Spanish)

65

Alternative food improves the combined effect of an omnivore and a predator on biological pest control. A case study in avocado orchards

González-Fernández, J.J.; Peña, F. de la; Hormaza, José Ignacio; Boyero, J.R.; Vela, J.M.; Wong, E.; Trigo, M.M.; Montserrat, Marta
2009-10-01

Digital.CSIC (Spain)

66

Alteration of bottom roughness by benthic organisms in a sandy coastal environment.

Guillén, Jorge; Soriano, J. S.; Demestre, Montserrat; Falqués, A.; Palanques, Albert; Puig, Pere
2008-10-15

Digital.CSIC (Spain)

67

Adiponectina: una adipocitoquina con múltiples funciones protectoras/ Adiponectin: an adipocytokine with multiple protective functions

Elissondo, Natalia; Gómez Rosso, Leonardo; Maidana, Patricia; Brites, Fernando
2008-03-01

Resumen en español Actualmente, se considera que el tejido adiposo es un órgano dinámico involucrado en muchos procesos fisiológicos y metabólicos. Expresa y secreta una gran variedad de péptidos activos conocidos como adipocitoquinas que actúan en forma local y sistémica. Además, expresa numerosos receptores que le permiten responder a señales aferentes de diferentes órganos endocrinos y del sistema nervioso central. La adiponectina es una hormona de 30 kDa producida exclusivamen (mas) te por el tejido adiposo. A diferencia de las demás adipocitoquinas conocidas, sus niveles se encuentran disminuídos en estados asociados con resistencia insulínica, tal como obesidad, diabetes tipo 2 y síndrome metabólico. A esta proteína se le ha atribuído un rol antidiabético, antiinflamatorio y antiaterogénico. El objetivo de este trabajo es realizar una revisión acerca de la estructura, las funciones biológicas, el o los posibles mecanismos de acción, las implicancias fisiopatológicas y las posibles aplicaciones de la evaluación de los niveles de esta adipocitoquina a nivel clínico. Resumen en inglés The adipose tissue is considered a dynamic organ, which is involved in a wide range of physiological and metabolic processes. This tissue expresses and secretes a variety of bioactive peptides, known as adipocytokines, which act both at the local and at the systemic levels. The adipose tissue also expresses several receptors that allow it to respond to afferent signals from different endocrine organs, as well as form the central nervous system. Adiponectin is a 30 kDa hor (mas) mone exclusively secreted by adipocytes. Unlike the other known adipocytokines, its concentration is reduced in conditions associated to insulin resistance, like obesity, type2 diabetes and metabolic syndrome. Several studies suggest that adiponectin has antidiabetic, antiinflammatory and antiatherogenic actions. The aim of this work is to review the new advances in structure, biological functions, mechanisms of action and potential clinical applications of adiponectin evaluation.

Scientific Electronic Library Online (Spanish)

68

A path planning approach for computing large-amplitude motions of flexible molecules

Cortés, Juan; Simeon, Thierry; Ruíz de Angulo García, Vicente; Guieysse, David; Remaud-Simeon, Magalli
2005-01-01

Digital.CSIC (Spain)

69

Estudio de la distribución y dinámica de los micronutrientes Cu y Zn en andosoles de las Islas Canarias. III

Borges Pérez, A.; Trujillo Jacinto del Castillo, I.; Gutierrez Jerez, F.; Pérez Méndez, J. A.
1980-01-01

Digital.CSIC (Spain)