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Search Results: 1 - 10 of 2013 matches for " Norma Osnaya Brizuela "
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Effect of Nicotine on Dopamine and Glutathione Levels in Presence of Oligoelements in Brain Regions of Young Rats——Effect of Nicotine on Brain Regions of Rat  [PDF]
David Calderón Guzmán, Ernestina Hernández García, Francisca Trujillo Jiménez, Gerardo Barragán Mejía, Hugo Juárez Olguín, José A. Saldivar González, Daniel Santamaria del Angel, Norma Osnaya Brizuela
Neuroscience & Medicine (NM) , 2012, DOI: 10.4236/nm.2012.33032
Abstract: Aim: The purpose of this study was to understand the mechanism of nicotine mediated addiction and the role of oligoelements in reducing its effect. Methods: Male Wistar rats (weight 80 g) were treated with single and repeated doses of nicotine and/or oligoelements as follows: group 1 (control) NaCl 0.9%; group 2, nicotine (1 mg/kg); group 3, oligoelements (50 μl/rat); and group 4, nicotine (1 mg/kg) + oligoelements (50 μl/rat). All drugs were intraperitoneally administered for 4 days. Blood for the measurement of glucose was obtained from all the animals. Samples of the brain regions (cortex, hemispheres and cerebellum + medulla oblongata) of each rat were obtained and used to measure the concentrations of dopamine, GSH levels, and lipid peroxidation (TBARS) using fluorescence and spectrophotometric methods. Results: Glucose level increased in rats treated with nicotine and oligoelements (p < 0.05), while GSH level decreased in cerebellum/medulla oblongata and hemispheres (p < 0.05) of the same animals. TBARS levels increased in cerebellum/medulla oblongata and hemispheres of animals treated with nicotine and oligoelements, but decreased in the same regions (p < 0.05) in rats treated only with oligoelements. The levels of dopamine decreased in cortex and hemispheres, but increased in cerebellum/medulla and oblongata regions of rats treated with both compounds (p < 0.05). Conclusions: Nicotine and oligoelements are associated with increase in the level of glucose, an effect that was more pronounced in the group treated with both drugs. Reduction of oxidative stress and dopamine metabolism may be involved in this effect.
Effect of Cardioxane and Selenium on Lipoperoxidation and Levels of Dopamine in Rat Brain and Heart  [PDF]
David Calderón Guzmán, Norma Osnaya Brizuela, Gerardo Barragán Mejía, Hugo Juárez Olguín, Lulú Sánchez Reyes, Armando Valenzuela Pereza, Norma Labra Ruiz, Daniel Santamaría del Angel
Neuroscience & Medicine (NM) , 2019, DOI: 10.4236/nm.2019.104026
Abstract: Background: Cardioxane has been probed in patients with advanced malignancies to protect the heart. Selenium, an essential micronutrient exerts varieties of functions such as antioxidant. The aim of this study was to test if cardioxane (CDX) and selenium (Se) have additive antioxidant protective effect on brain and heart, and their relation with dopamine levels. Methods: Thirty-six male Wistar rats divided in groups of 6 animals each, were treated as follows: G1, saline solution 0.9% (control); G2, 100 mg/kg of CDX; G3, 60 μg/kg of Se; G4, 20 mg/kg of 3-nitropropionic acid (3NP); G5, 3NP + CDX and G6, 3NP + Se. 3NP was used as an oxidative stress inducer. Drugs were administered intraperitoneally for 5 days. The animals were sacrificed on the last day of treatment and the brain and heart were extracted and used to measure lipid peroxidation, dopamine, glutathione (GSH), ATPase, calcium, and H2O2. Results: In G2 and G5, dopamine decreased in cortex and striatum while GSH increased in heart, cortex and cerebellum/medulla oblongata. ATPase activity increased in heart and cortex of groups 2, 3, 5 and 6. Lipoperoxidation and H2O2 increased in cortex of animals treated with 3NP. Conclusion: These results suggest that CDX increases antioxidant capacity in the brain and heart while selenium promotes alteration in dopamine metabolism in view of the capacity of 3NP to generate free radicals.
Consistencia interna y estructura factorial de la Escala de Desesperanza de Beck en estudiantes mexicanos
Martha Córdova Osnaya
Revista de Psicología , 2011,
Abstract: Internal consistency and factorial structure of the Beck Hopelessness Scale among Mexican students The Beck Hopelessness Scale was applied in a sample of 971 male and female students, chosen at random sampling from Mexico City, with an average age of 16.75 years. Results were compared to those reported by Beck, Weissman, Lester and Trexler (1974). Results showed adequate reliability (≥ 0.70) in the total sample by gender. Factorial structure matched only in the Affective factor as reported by Beck et al. (1974) with respect to the total sample. Differences in saturation and factorial structure in both sexes were observed. It was concluded that the factor structure of Beck Hopelessness Scale registers different factor structure in the total sample, according to sex. En una muestra de 971 estudiantes de ambos sexos elegidos en forma aleatoria de la ciudad de México con un promedio de edad de 16.75 anos, se aplicó la Escala de Desesperanza de Beck. Se calculo la consistencia interna y la estructura factorial con el procedimiento reportado por Beck, Weissman, Lester y Trexler (1974) en muestra total y por sexo. Los resultados indicaron confiabilidad adecuada (≥ .70) en la muestra total y por sexo, estructura factorial coincidente solo en el factor Afectivo en la muestra total, y diferencias de saturación y de estructura factorial en ambos sexos. Se concluyo que la Escala de Desesperanza de Beck registra diferente estructura factorial en muestra total y de acuerdo con el sexo.
Statistical moments for classical and quantum dynamics: formalism and generalized uncertainty relations
David Brizuela
Physics , 2014, DOI: 10.1103/PhysRevD.90.085027
Abstract: The classical and quantum evolution of a generic probability distribution is analyzed. To that end, a formalism based on the decomposition of the distribution in terms of its statistical moments is used, which makes explicit the differences between the classical and quantum dynamics. In particular, there are two different sources of quantum effects. Distributional effects, which are also present in the classical evolution of an extended distribution, are due to the fact that all moments can not be vanishing because of the Heisenberg uncertainty principle. In addition, the non-commutativity of the basic quantum operators add some terms to the quantum equations of motion that explicitly depend on the Planck constant and are not present in the classical setting. These are thus purely-quantum effects. Some particular Hamiltonians are analyzed that have very special properties regarding the evolution they generate in the classical and quantum sector. In addition, a large class of inequalities obeyed by high-order statistical moments, and in particular uncertainty relations that bound the information that is possible to obtain from a quantum system, are derived.
Classical versus quantum evolution for a universe with a positive cosmological constant
David Brizuela
Physics , 2015, DOI: 10.1103/PhysRevD.91.085003
Abstract: A homogeneous and isotropic cosmological model with a positive cosmological constant is considered. The matter sector is given by a massless scalar field, which can be used as an internal time to deparametrize the theory. The idea is to study and compare the evolutions of a quantum and a classical probability distribution by performing a decomposition of both distributions in their corresponding moments. For the numerical analysis an initial peaked Gaussian state in the volume will be chosen. Furthermore, in order to check the robustness of certain results, as initial state both a slightly deformed Gaussian, as well as another completely different state, will also be studied. Differences and similarities between classical and quantum moments are pointed out. In particular, for a subset of moments classical and quantum evolutions are quite similar, but certain variables show remarkable differences.
Classical and quantum behavior of the harmonic and the quartic oscillators
David Brizuela
Physics , 2014, DOI: 10.1103/PhysRevD.90.125018
Abstract: In a previous paper a formalism to analyze the dynamical evolution of classical and quantum probability distributions in terms of their moments was presented. Here the application of this formalism to the system of a particle moving on a potential is considered in order to derive physical implications about the classical limit of a quantum system. The complete set of harmonic potentials is considered, which includes the particle under a uniform force, as well as the harmonic and the inverse harmonic oscillators. In addition, as an example of anharmonic system, the pure quartic oscillator is analyzed. Classical and quantum moments corresponding to stationary states of these systems are analytically obtained without solving any differential equation. Finally, dynamical states are also considered in order to study the differences between their classical and quantum evolution.
Quantum back-reaction in a universe with positive cosmological constant
David Brizuela
Physics , 2011, DOI: 10.1088/1742-6596/360/1/012026
Abstract: Semiclassical techniques have proven to be a very powerful method to extract physical effects from different quantum theories. Therefore, it is expected that in the near future they will play a very prominent role in the context of quantum gravity. In this work we develop systematic tools to derive semiclassical approximations for any quantum theory with one degree of freedom. In our approach, the wave function is decomposed in terms of an infinite set of moments, which encode the complete quantum information of the system. Semiclassical regimes can then be properly described by truncation of this infinite system. The use of efficient computer algebra tools allows us to compute the equations of motion up to a very high order. In this way, we can study very precisely the quantum back reaction of the system as well as the convergence of the method with the considered order. Finally, these tools are applied to the particular case of a homogeneous universe filled with a massless scalar field and positive cosmological constant, which provide interesting physical results.
The Relationship between the Leadership Styles of Lebanese Public School Principals and Their Attitudes towards ICT versus the Level of ICT Use by Their Teachers  [PDF]
Norma Ghamrawi
Open Journal of Leadership (OJL) , 2013, DOI: 10.4236/ojl.2013.21002
Abstract: This study investigates the relationship between the leadership styles exhibited by almost 50% of the total population of public school principals (N= 651) in Lebanonand their attitudes and the level of use of technology for educational purposes in their schools. Datawerecollected by surveying school principals via two questionnaires. Moreover, one teacher from each participant public school (N=651) completed a questionnaire pertaining to the level of use of technology in the school. Findings suggest the existence of positive correlation between the autocratic leadership styles of school principals and their negative attitudes towards the use of ICT for educational purposes. In addition, the results of the study accentuate another positive correlation existing between principals’ attitudes towards the use of ICT for educational purposes and the level of its use by their teachers in schools. Recommendations for further research and implications for school leadership and training programs are provided.
Presencia de Equus (Amerhippus) neogeus Lund en el yacimiento paleontológico de Pehuen Có (Pleistoceno tardío de la provincia de Buenos Aires) y su significado bioestratigráfico Occurrence of Equus (Amerhippus) neogeus Lund in the paleontological site of Pehuen Có (Late Pleistocene of the Province of Buenos Aires) and its biostratigraphic implications
R. Rodríguez Brizuela
Revista de la Asociación Geológica Argentina , 2005,
Abstract: Se comunica el hallazgo de material paleontológico asignado a Equus (Amerhippus) neogeus Lund en la localidad de Pehuen Có, provincia de Buenos Aires. La importancia del registro radica en que se trata del primer équido descripto en esta localidad, verificándose la edad pleistocena tardía (Lujanense) de los sedimentos portadores, anteriormente obtenida mediante métodos radimétricos. The record of fossil material assigned to Equus (Amerhippus) neogeus in Pehuen Có, Buenos Aires province, is presented. This record is important because it represents the first equid described from the locality, and verifies the Late Pleistocene age of the sediments (Lujanean), obtained earlier by radiometric methods.
The Past Never Stays Behind: Biographical Narrative and African Colonial History
Esperanza Brizuela-Garcia
Journal of Historical Biography , 2007,
Abstract:
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