C Gómez

Publications (3)2.53 Total impact

• Article: Effect of electrical stimulation of the baso-lateral amygdala nucleus on defensive burying shock probe test and elevated plus maze in rats.

  J A Saldívar-González, A Posadas-Andrews, R Rodríguez, C Gómez, M E Hernández-Manjarrez, S Ortiz-León, A Martínez-Pineda, D Gómez-Laguna, V Salgado, J Manjarrez, R Alvarado
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  ABSTRACT: In the present report, the putative effect of a single electrical stimulation (75, 150 or 300 microA) to the baso-lateral amygdala (BLA) nucleus was assessed in shock probe defensive burying behavior test (DB) and elevated plus maze (EPM). These models have been used for measuring anxiety levels and screening putative anxiolytic compounds. A group of 28 rats were randomly divided for the following experimental conditions: Control-control, sham-operated, BLA stimulated groups: 75, 150 and 300 microA tested for DB. The cumulative defensive burying in a 15 min-test, the latency of burying, the number of shock received and the height of the bedding material in the probe were recorded. Another group of 28 individuals was also randomly distributed for the following experimental conditions: Control-control, sham-operated, BLA stimulated animals: 75, 150, 300 microA and tested in the EPM. The time the subjects spent in the open arms, the crosses and the faeces number excreted during the test were recorded. Decreased levels of defensive burying were observed in 75, 150 and 300 microA stimulated groups. The 150 and 300 microA groups reached statistical significance. The fact that 300 microA stimulated group showed statistically significant increase in the latency of defensive burying, in the number of shock received and decreased amount in bedding material suggests a sedative action of electrical stimulation. Increased time in the open arms and augmented number of crossings in 150 microA group was observed. No changes in the number of faeces were observed in any group. The evidence supported the notion of an inhibitory amygdaline mechanism triggered by sub-threshold electrical stimulation.
  Life Sciences 02/2003; 72(7):819-29. · 2.53 Impact Factor
• Source

  Available from: Jose M Taboada

  Article: Supercomputing aware electromagnetics

  J M Taboada, L Landesa, J Rivero, G Gajardo-Silva, M Amaya, F Obelleiro, J L Rodríguez, M G Araújo, J M Bértolo, J C Mouriño, A Gómez, C Gómez, J L González-Sánchez
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  ABSTRACT: The Fast Fourier Transform (FFT) extension of the conventional Fast Multipole Method (FMM) has demonstrated that it reduces the matrix vector product (MVP) complexity while preserving the propensity for parallel scaling of the single level FMM. An efficient hybrid MPI/OpenMP parallel implementation of the FMM-FFT and, subsequently, an improved nested scheme of the algorithm, and a combination with MLMFMA have been employed successfully for the solution of challenging problems with hundreds of millions of unknowns.
• Source

  Available from: psu.edu

  Article: A dynamic and compact fault-tolerant strategy for fat-tree

  C Gómez, M E Gómez, P López, J Duato
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  ABSTRACT: High-performance interconnection networks are used to achieve the maximum performance in clusters of PCs. The fat-tree topology has raised in popularity in the last few years. Routing and fault-tolerance are two important design issues of these networks. This paper presents a dynamic fault-tolerant routing strategy for fat-trees without additional hardware, supporting a reasonable number of faults. After a fault, an algorithm dynamically spreads the routing information, with a small impact on global system throughput. The proposal is based on enhancing the Interval Routing scheme with exclusion intervals to indicate the nodes that become unreachable after a fault appears.