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Search Results: 1 - 10 of 9601 matches for " Jaime Fernandez "
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Myopericarditis: Physiopathological Consideration and Image Diagnosis—A Case Report  [PDF]
Santiago de Dios, Alfonso Jurado, Jaime Fernandez
World Journal of Cardiovascular Diseases (WJCD) , 2014, DOI: 10.4236/wjcd.2014.410061
Abstract: Myocarditis is a disease whose diagnosis is based on the detection of inflammation. It is usually made by the finding of myocardium damage markers (usually troponin and CPK). Inflammation can also be detected in image tests. However, the low sensitivity and specificity of echocardiogram (which can be performed as a routine) make it less useful. We present a case in which the diagnosis was made by image (Cardiac Magnetic Resonance) which helped to clarify the evolution and the prognosis. The aim of this case is to show the importance of image technics in the diagnosis of myocarditis, while biomarkers alone can underestimate the inflammation and therefore the risk.
Unconventional magnetism in small gold organic molecules
Diego Carrascal,Lucas Fernandez-Seivane,Jaime Ferrer
Physics , 2009, DOI: 10.1103/PhysRevB.80.184415
Abstract: We present a theoretical study of the magnetic properties of dicyclopentadienyl metallocene and phthalocyanine molecules, that contain the transition metal atoms M = Fe, Co, Ni, Cu, Zn, Ir, Pt and Au. Our most important prediction is that gold and copper molecules are magnetic. We find that the magnetism of these molecules is fairly unconventional: the gold atom itself is weakly magnetic or even non-magnetic. Its role is rather to induce magnetism in the surrounding carbon and nitrogen atoms, producing a sort of spin density wave.
PHYSIOLOGICAL RESPONSES TO ON-COURT VS RUNNING INTERVAL TRAINING IN COMPETITIVE TENNIS PLAYERS
Jaime Fernandez -Fernandez,David Sanz-Rivas,Cristobal Sanchez-Mu?oz,Jose Gonzalez de la Aleja Tellez
Journal of Sports Science and Medicine , 2011,
Abstract: The aim of this study was to compare heart rate (HR), blood lactate (LA) and rate of perceived exertion (RPE) responses to a tennis-specific interval training (i.e., on-court) session with that of a matched-on-time running interval training (i.e., off-court). Eight well-trained, male (n = 4) and female (n = 4) tennis players (mean ± SD; age: 16.4 ± 1.8 years) underwent an incremental test where peak treadmill speed, maximum HR (HRmax) and maximum oxygen uptake (VO2max) were determined. The two interval training protocols (i.e., off- court and on-court) consisted of 4 sets of 120 s of work, interspersed with 90 s rest. Percentage of HRmax (95.9 ± 2.4 vs. 96.1 ± 2.2%; p = 0.79), LA (6.9 ± 2.5 vs. 6.2 ± 2.4 mmol·L-1; p = 0.14) and RPE (16.7 ± 2.1 vs. 16.3 ± 1.8; p = 0.50) responses were similar for off-court and on-court, respectively. The two interval training protocols used in the present study have equivalent physiological responses. Longitudinal studies are still warranted but tennis-specific interval training sessions could represent a time-efficient alternative to off-court (running) interval training for the optimization of the specific cardiorespiratory fitness in tennis players
ANTI-TICK EFFECT OBSERVED IN MATURE PLANTS O TROPICAL LEGUMES Stylosanthes humilis and Stylosanthes hamata
CRUZ-VAZQUEZ,CARLOS; FERNANDEZ-RUVALCABA,MANUEL; SOLANO-VERGARA,JAIME; GARCIA-VAZQUEZ,ZEFERINO;
Parasitología al día , 1999, DOI: 10.4067/S0716-07201999000100003
Abstract: abstract the anti-tick effect of stylosanthes humilis and stylosanthes hamata was evaluated for mature plants on plots experimentally infested with larvae of the cattle tick boophilus microplus. cenchurus ciliaris was used as control grass. the effect was evaluated counting the total number of live tick larvae recovered by the double flannel flag technique from the experimental plots during a four week period. the effect observed in both stylosanthes species did not show significant differences (p > 0.05) between them and the larval survival percentage was 5.1 % for s. humilis and 7.5 % for s. hamata. in the first specie the anti-tick effect was lower than the one reported for young plants, but in s. hamata this effect was similar in young and mature plants. further studies are necessary to complement the knowledge about this plant and to establish their use in field conditions..
ANTI-TICK EFFECT OBSERVED IN MATURE PLANTS O TROPICAL LEGUMES Stylosanthes humilis and Stylosanthes hamata
CARLOS CRUZ-VAZQUEZ,MANUEL FERNANDEZ-RUVALCABA,JAIME SOLANO-VERGARA,ZEFERINO GARCIA-VAZQUEZ
Parasitología al día , 1999,
Abstract: ABSTRACT The anti-tick effect of Stylosanthes humilis and Stylosanthes hamata was evaluated for mature plants on plots experimentally infested with larvae of the cattle tick Boophilus microplus. Cenchurus ciliaris was used as control grass. The effect was evaluated counting the total number of live tick larvae recovered by the double flannel flag technique from the experimental plots during a four week period. The effect observed in both Stylosanthes species did not show significant differences (p > 0.05) between them and the larval survival percentage was 5.1 % for S. humilis and 7.5 % for S. hamata. In the first specie the anti-tick effect was lower than the one reported for young plants, but in S. hamata this effect was similar in young and mature plants. Further studies are necessary to complement the knowledge about this plant and to establish their use in field conditions.. RESUMEN El efecto anti-garrapata de plantas maduras de las leguminosas tropicales Stylosanthes humilis y Stylosanthes hamata , fue evaluado en parcelas experimentalmente infestadas con larvas de garrapata Boophilus microplus, utilizando al pasto Cenchurus ciliaris como tratamiento testigo. El efecto fue evaluado contando el número total de larvas vivas recuperadas de las parcelas experimentales por la técnica de bandera de doble recorrido durante un periodo de cuatro semanas. El efecto anti-garrapata observado en ambas especies de Stylosanthes no mostró diferencias entre ellas (p<0.05), el porcentaje de sobrevivencia de larvas fue del 5.1% para S. humilis y 7.5% para S. hamata. En la primera especie el efecto anti-garrapata fue menor que el reportado en plantas jóvenes, pero en S. hamata este efecto fue similar en plantas maduras y jóvenes. Es necesario realizar más estudios para complementar el conocimiento que se tiene acerca de estas plantas y establecer su uso en condiciones de campo
Predictions for the formation of new atomic chains in Mechanically Controllable Break Junction experiments
Lucas Fernandez-Seivane,Victor M. Garcia-Suarez,Jaime Ferrer
Physics , 2006, DOI: 10.1103/PhysRevB.75.075415
Abstract: We analyze the stability and magnetic properties of infinite zigzag atomic chains of a large number of late third, fourth and fifth-row transition metal atoms, as well as of the Group IV elements Si, Ge, Sn and Pb. We find that zigzag chains of third- and fourth-row elements are not stable, while those made of Si, Ge, Sn, Pb, W, Os, Ir, Pt and Au are. These results correlate well with known data in Mechanically Controllable Break Junction experiemnts (MCBJE). We therefore conjecture that the stability of an infinite chain is at least a necessary condition for the formation of a finite sized one in MCBJE. We therefore predict that Sn and Os, and possibly W and Pb chains may be found in those experiments. We also find that the bonds in Hg chains are extremely soft. We finally show that the magnetic moments and anisotropies of Ir and Pt chains show a non-trivial behavior.
The magnetic and crystal structures of Sr2IrO4: A neutron diffraction study
Feng Ye,Songxue Chi,Bryan C. Chakoumakos,Jaime A. Fernandez-Baca,Tongfei Qi,G. Cao
Physics , 2013, DOI: 10.1103/PhysRevB.87.140406
Abstract: We report a single-crystal neutron diffraction study of the layered $\rm Sr_2IrO_4$. This work unambiguously determines the magnetic structure of the system and reveals that the spin orientation rigidly tracks the staggered rotation of the $\rm IrO_6$ octahedra in $\rm Sr_2IrO_4$. The long-range antiferromagnetic order has a canted spin configuration with an ordered moment of 0.208(3) $\mu_B$/Ir site within the basal plane; a detailed examination of the spin canting yields 0.202(3) and 0.049(2) $\mu_B$/site for the a axis and the b axis, respectively. It is intriguing that forbidden nuclear reflections of space group $I4_1/acd$ are also observed in a wide temperature range from 4 K to 600 K, which suggests a reduced crystal structure symmetry. This neutron-scattering work provides a direct, well-refined experimental characterization of the magnetic and crystal structures that are crucial to the understanding of the unconventional magnetism exhibited in this unusual magnetic insulator.
On-site approximation for spin-orbit coupling in LCAO density functional methods
Lucas Fernandez-Seivane,Miguel A. Oliveira,Stefano Sanvito,Jaime Ferrer
Physics , 2006, DOI: 10.1088/0953-8984/19/48/489001
Abstract: We propose a computational method that simplifies drastically the inclusion of spin-orbit interaction in density functional theory implemented on localised atomic orbital basis sets. Our method is based on a well-known procedure for obtaining pseudopotentials from atomic relativistic 'ab initio' calculations and on an on-site approximation for the spin-orbit matrix elements. We have implemented the technique in the SIESTA code, and we show that it provides accurate results for the overall band structure and splittings of group IV and III-IV semiconductors as well as for 5d metals.
Early Feeding vs 5-Day Fasting after Distal Elective Bowel Anastomoses in Children. A Randomized Controlled Trial  [PDF]
Roberto Davila-Perez, Eduardo Bracho-Blanchet, Francisco Galindo-Rocha, Jose Tovilla-Mercado, Gustavo Varela-Fascinetto, Emilio Fernandez-Portilla, Pablo Lezama-del-Valle, Jaime Nieto-Zerme?o
Surgical Science (SS) , 2013, DOI: 10.4236/ss.2013.41008
Abstract:

Purpose: Determine the safety and efficacy of early enteral feeding after distal elective bowel anastomoses (DEBA) in children. Methods: Controlled randomized trial including pediatric patients with DEBA, excluding non-elective and high risk patients. Variables: Demographics, operative time, anastomosis placement, beginning peristalsis and bowel movement, time to full diet intake, post-operative stay, persisting vomiting and abdominal distention, wound infection or dehiscence, anastomotic leak, reoperation, death. Randomization into: 1) Experimental group (EG): early feeding group, after a minimum 24 hours fasting period, oral fluids and diet was started; 2) Control group (CG): obligatory 5-day fasting. Descriptive Statistics: Students t test for quantitative and Chi square for qualitative variables, a p-value < 0.05 was considered significant. Results: 60 patients were included since June 2003 to May 2004, 30 ineach group. Mean age 2 years, weight16 kg, malnutrition 33%. Stomal Ethiology: Anorectal-malformation 46%, Hirschsprung 13%, inflammatory 35%, tumoral 5%. Mostly in colon 71%. Mean surgical time 142 min. None developed vomiting or required nasogastric-tube. Mild abdominal distension 13%, mild fever 16.5% and wound complications 18%. Anastomosis leakage 6.5%, none required reoperations. Demographic variables showed no statistical differences. Full oral intake was in the 2nd postoperative day in the EG vs CG (p = 0.001). Postoperative hospital stay was 6.0 ± 3 in the EG vs 9.8 ± 4 days in the CG with clinical but not statistical significance. Peristalsis beginning, first flatus passage and bowel movements showed no statistical differences. The complication incidence was low and equally distributed. Conclusions: Early feeding after DEBA is safe and well tolerated in children.

Crystal Structure, SAXS and Kinetic Mechanism of Hyperthermophilic ADP-Dependent Glucokinase from Thermococcus litoralis Reveal a Conserved Mechanism for Catalysis
Jaime Andrés Rivas-Pardo, Alejandra Herrera-Morande, Victor Castro-Fernandez, Francisco J. Fernandez, M. Cristina Vega, Victoria Guixé
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0066687
Abstract: ADP-dependent glucokinases represent a unique family of kinases that belong to the ribokinase superfamily, being present mainly in hyperthermophilic archaea. For these enzymes there is no agreement about the magnitude of the structural transitions associated with ligand binding and whether they are meaningful to the function of the enzyme. We used the ADP-dependent glucokinase from Termococcus litoralis as a model to investigate the conformational changes observed in X-ray crystallographic structures upon substrate binding and to compare them with those determined in solution in order to understand their interplay with the glucokinase function. Initial velocity studies indicate that catalysis follows a sequential ordered mechanism that correlates with the structural transitions experienced by the enzyme in solution and in the crystal state. The combined data allowed us to resolve the open-closed conformational transition that accounts for the complete reaction cycle and to identify the corresponding clusters of aminoacids residues responsible for it. These results provide molecular bases for a general mechanism conserved across the ADP-dependent kinase family.
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