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Search Results: 1 - 10 of 461905 matches for " A. Crespi "
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N-methyl-D-aspartate (NMDA) mediates vascular relaxation via nitric oxide (NO) in rats but not in mice  [PDF]
Francesco Crespi
Advances in Bioscience and Biotechnology (ABB) , 2010, DOI: 10.4236/abb.2010.14045
Abstract: Amperometric studies have indicated that substance P as well as NMDA stimulates release of NO in rat aortic rings. These data have been confirmed by functional observations of vaso-relaxant action of NMDA within noradrenaline pre-contracted aortic rings, supporting the presence of NMDA receptor in rat aortic rings. It is known that the enzyme endothelial NO synthase (eNOS) mediates vasodilatation not only in rats, but also in C57BL6 mice aortic ring, indicating that in this blood vessel NO is the endogenous endothelium-derived vasodilator. In this work, amperometry together with specifically nitrites insensitive micro-biosensors have been applied to examine the effect of NMDA and substance P upon NO release in rat and in two strains of mice aortic rings. The electrochemical data monitored demonstrate that NMDA mediates vascular relaxation via NO in rats but not in mice. These results are supported by functional data, therefore they suggest that NMDA receptors are “not responding” within these experimental conditions in mice aortic rings.
Is a Divergent Central Serotonergic Activity Responsible for Either Despair or Learning Behavior in Intact Wistar or Sprague-Dawley CD Rats, Respectively? A Concomitant Behavioral and Electrochemical Analysis  [PDF]
Francesco Crespi
Psychology (PSYCH) , 2010, DOI: 10.4236/psych.2010.13028
Abstract: Behavioral observations combined with electrochemical analysis have been performed in Wistar or Sprague-Dawley CD rats in the attempt to clarify earlier controversial behavioral reports. In particular, these rats were submitted to FST and to repeated Forced Swimming (rFS, during 4 days). In parallel, voltammetric in vivo analysis of serotonin (5-HT) levels in platelet-rich plasma (PRP) collected daily from these animals was also performed as it is known that peripheral 5-HT levels monitored in rat PRP mirror cerebral 5-HT contents. Thus, combined behavioral-voltammetric studies allow deducing changes of central 5-HT levels that could be correlated to FST or rFS, with the advantage of non invasive analysis of central neurotransmitter activities in intact behaving animals. In particular, combined beha-vioral-voltammetric results suggest that “behavioral despair” is the process interesting Wistar rats when submitted to FST or rFS while “learning to be immobile” is the process involving Sprague-Dawley CD rats.
Contexto carcelario: un estudio de los estresores y las respuestas de afrontamiento en detenidos primarios y reincidentes
Mikulic,Isabel María; Crespi,Melina Claudia;
Anuario de investigaciones , 2005,
Abstract: this study shows preliminary results obtained in actual research on primary offenders and repeat offenders. its objective has been to assess offenders coping responses when perceiving stressing events. coping responses have been analyzed from a risk perception and protective factors approach, specially taking into consideration context characteristics in prison environment. an exploratory-descriptive field study allowed us to compare two intentional samples, 35 primary offenders and 35 repeat offenders. results show avoidance predominance within coping strategies both in primary offenders and repeat offenders responses. main reported stressing events were: lack of freedom, family distance and spouse separation. avoidance responses are associated with a state of helplessness which weakens offenders posibilities of well-being and own life control, making it difficult to promote and develop resilient characteristics in this population.
Adaptación y validación del inventario de respuestas de afrontamiento de moos (CRI-A) para adultos
Mikulic,Isabel María; Crespi,Melina Claudia;
Anuario de investigaciones , 2008,
Abstract: present study introduces adapted version of coping responses inventory (cri-a, moos, 1993; adapted version mikulic, 1998) and results obtained after analyzing psychometric properties. it was administered to a sample of 805 participants residing in buenos aires, ages between 20 and 50 years old, (m=30,5 ; sd= 8,7) 53,5% women and 46,5% men. alpha found shows high internal consistency (.85) and specific subscales present acceptable coefficients factorial analysis allowed us to identify two main components: approach and avoidance, and subscales grouping as proposed by moos theoretical approach. only one difference arose, seeking alternative rewards loaded on the opposite factor: these findings confirmed this adapted version psychometric properties make it a valid instrument to assess coping in our context.
Reinserción social de liberados condicionales: análisis de la dimensión relacional desde el enfoque de redes de apoyo social
Crespi,Melina Claudia; Mikulic,Isabel María;
Anuario de investigaciones , 2009,
Abstract: this work aims to incorporate the relational dimension in understanding the process of social reintegration of those released, assessing the structural, functional and contextual social support networks of this population. an exploratory-descriptive study was performed with the participation of 85 subjects on conditional release. to analyze the structural and functional characteristics of the networks a community social support questionnaire (casc) has been designed and administered. contextual aspects of the networks were assessed through semi-structured interviews. data from these interviews has been analyzed using qualitative analysis strategies. the results show the presence of vulnerable networks characterized by their small size, high density, few connections to other subnets due to the lack of a joint which could be used as bridges to some heterogeneous networks and poor support functions especially in the social and community level. networks are also characterized by the existence of various breaks in the relationships that provide the contextual framework for understanding the vulnerability reported.
Los medios argentinos frente a la muerte de Diana de Gales. Análisis de la construcción sensacionalista de un mito de fin de siglo
Lic. María Verónica Crespi
Revista Latina de Comunicación Social , 2005,
Abstract: Tratamiento de la prensa argentina a la muerte de la princesa de Gales.
Crecimiento Personal, Necesidad de Trascendencia, Redes Sociales y Ambiente: análisis de la Calidad de Vida Percibida en diferentes sucesos estresantes desde un enfoque integrativo y ecológico
Mikulic,Isabel María; Mui?os,Roberto; Crespi,Melina;
Anuario de investigaciones , 2007,
Abstract: perceived quality of life assessment of persons undergoing stressful life events such as imprisonment, diseases, divorce, close relatives loss or forced migration, has received relatively little attention in the literature. athough there is no consensus on the definition of qol and its measurement, it is generally accepted that qol is a multidimiensional construct. in previous studies (mikulic, mui?os, 2004) it has been showed pqol inventory design and validation and 0sem applied to verify factorial structure. the second- order cfa suggested that qol may be measured by five underlying factors: environment, social networks, personal growth and transcedence needs. the aim of this study is to estimate the existence and magnitude of the latent identified factors in the quality of life perceived by participants undergoing different stressful life events.
Evaluación de la Inteligencia Emocional, la Satisfacción Vital y el Potencial Resiliente en una muestra de estudiantes de psicología
Mikulic,Isabel María; Crespi,Melina Claudia; Cassullo,Gabriela Livia;
Anuario de investigaciones , 2010,
Abstract: in the last decades the interest to study the influence that the emotional intelligence has towards vital satisfaction and welfare specifically among students has led to several theoretical and research developments. considering that emotional intelligence involves the abilities to perceive, understand and manage the emotions in a proper way, its study has had a strong impact on the educational field. the objetive of the present study is to assess the relationship between emotional intelligence, vital satisfaction and resilient potential as well as to study the role that emotional intelligence plays as predictor of vital satisfaction and resilient potential in a sample of university students of psychology. a correlational study was developed with intentional sample formed consisting in 96 participants of the school of psychology in the most important public university of buenos aires. results show the presence of significant positive relationships among emotional intelligence, vital satisfaction and well-being. participants with high emotional intelligence show higher vital satisfaction as well as higher personal and family protective factors and resilient sources. psychological well-being of emotional intelligence subscales proved to be the best predictor of satisfaction with life and personal protective factors.
Study of the γ decay of high-lying states in 208Pb via inelastic scattering of 17O ions
Bracco A.,Crespi F.C.L.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20123803001
Abstract: High-lying states in 208Pb nucleus were populated via inelastic scattering of a 17O beam at bombarding energy of 20 MeV/u. Their subsequent gamma decay was measured with the detector system AGATA Demonstrator based on HPGe detectors, coupled to an array of large volume LaBr3:Ce scintillators. Preliminary results in comparison with (γ,γ′) data, for states in the 5–8 MeV energy interval, seem to indicate that in that region the states belong to two different groups one with a isoscalar character and the other with a isovector nature. This is similar to what was observed in other stable nuclei with (α,α′γ) experiments. The multipolarity of the observed gamma transitions is determined with remarkable sensitivity thanks to angular distribution measurements. Data aiming at studying the neutron decay of the Giant Quadrupole Resonance in the 208Pb by the high resolution measurement of the following gamma decay are also presented in their preliminary form.
Crystal chemistry of three-component white dwarfs and neutron star crusts: phase stability, phase stratification, and physical properties
T. A. Engstrom,N. C. Yoder,V. H. Crespi
Physics , 2015,
Abstract: A systematic search for multicomponent crystal structures is carried out for five different ternary systems of nuclei in a polarizable background of electrons, representative of accreted neutron star crusts and some white dwarfs. Candidate structures are "bred" by a genetic algorithm, and optimized at constant pressure under the assumption of linear response (Thomas-Fermi) charge screening. Subsequent phase equilibria calculations reveal eight distinct crystal structures in the $T=0$ bulk phase diagrams, five of which are complicated multinary structures not before predicted in the context of compact object astrophysics. Frequent instances of geometrically similar but compositionally distinct phases give insight into structural preferences of systems with pairwise Yukawa interactions, including and extending to the regime of low density colloidal suspensions made in a laboratory. As an application of these main results, we self-consistently couple the phase stability problem to the equations for a self-gravitating, hydrostatically stable white dwarf, with fixed overall composition. To our knowledge, this is the first attempt to incorporate complex multinary phases into the equilibrium phase layering diagram and mass-radius-composition dependence, both of which are reported for He-C-O and C-O-Ne white dwarfs. Finite thickness interfacial phases ("interphases") show up at the boundaries between single-component bcc crystalline regions, some of which have lower lattice symmetry than cubic. A second application -- quasi-static settling of heavy nuclei in white dwarfs -- builds on our equilibrium phase layering method. Tests of this nonequilibrium method reveal extra phases which play the role of transient host phases for the settling species.
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