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Search Results: 1 - 10 of 221466 matches for " Loreto; Salgado C "
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Timpanoplastías en pacientes mayores de 50 a?os: Experiencia en el Hospital San Juan de Dios
Nickias D,Loreto; Salgado C,Saúl; Arancibia S,Margarita; Orellana C,Juan José;
Revista de otorrinolaringología y cirugía de cabeza y cuello , 2007, DOI: 10.4067/S0718-48162007000100005
Abstract: background: it has been published that the result of tympanic membrane surgery is conditioned by the patient's age, being of worse prognosis in elder patients. according to recent studies, this tendency is decreasing. aim: to assess the anatomical and auditory results of tympanoplasty performed in our department on patients older than 50 years old, in a 4-year period, analyzing other variables as well. methods: study of 23 patients. results: the surgery was anatomically succesful in 82,6% of cases after a first surgery. in 52% of patients there was an auditory improvement of at least 10 db of the aerial pure tone average. conclusions: there were no significant anatomical or auditory differences in this age group compared with the general population, nor in the subgroup of older age. moreover, there were no significant differences related to the type of graft, its position or surgical technique used, nor related to surgical variables such as use of postoperative antibiotic, presence of myringosclerosis, use ofgelfoam or status of the contralateral ear
Timpanoplastías en pacientes mayores de 50 a os: Experiencia en el Hospital San Juan de Dios Tympanoplasty in patients older than 50 years old: San Juan de Dios Hospital experience
Loreto Nickias D,Saúl Salgado C,Margarita Arancibia S,Juan José Orellana C
Revista de Otorrinolaringología y Cirugía de Cabeza y Cuello , 2007,
Abstract: Introducción: Se ha descrito que el resultado de las cirugías de la membrana timpánica está condicionado por la edad del paciente, siendo peor en los casos de edades extremas. Según las últimas publicaciones esta tendencia se ha demostrado en disminución. Objetivo: Evaluar los resultados anatómicos y auditivos de las timpanoplastías de nuestro servicio en pacientes mayores de 50 a os, en un periodo de 4 a os, analizando además otras variables relativas a la cirugía. Material y método: Revisión de 23 oídos. Resultados: éxito anatómico en el 82,6% de los casos con una primera cirugía. En el 52% se obtuvo mejoría auditiva en al menos 10 dB del promedio tonal puro aéreo. Conclusión: No hay diferencias significativas anatómicas y auditivas en este grupo de edad con respecto al resto de la población general ni tampoco en subgrupos de edades más extremas. Tampoco se encontraron diferencias significativas en relación al tipo de injerto, posición de éste y vía de abordaje utilizada, ni en relación a variables quirúrgicas como son: uso de antibiótico posoperatorio, presencia de miringoesclerosis, uso de gelfoam en la caja y estado del oído contralateral Background: It has been published that the result of tympanic membrane surgery is conditioned by the patient's age, being of worse prognosis in elder patients. According to recent studies, this tendency is decreasing. Aim: To assess the anatomical and auditory results of tympanoplasty performed in our department on patients older than 50 years old, in a 4-year period, analyzing other variables as well. Methods: Study of 23 patients. Results: The surgery was anatomically succesful in 82,6% of cases after a first surgery. In 52% of patients there was an auditory improvement of at least 10 dB of the aerial pure tone average. Conclusions: There were no significant anatomical or auditory differences in this age group compared with the general population, nor in the subgroup of older age. Moreover, there were no significant differences related to the type of graft, its position or surgical technique used, nor related to surgical variables such as use of postoperative antibiotic, presence of myringosclerosis, use ofgelfoam or status of the contralateral ear
x_F-dependence of J/Psi suppression in pA collisions
C. A. Salgado
Physics , 2001, DOI: 10.1016/S0370-2693(01)01162-5
Abstract: Coherence effects are important in the description of collisions with extended objects as nuclei. At fixed target energies and small x_F, the coherence length of the fluctuation containing the $c\bar c$ is small and the usual nuclear absorption model is valid. However, at higher energies and/or x_F the nucleus is seen as a whole by the fluctuation. In this case, the total, not the absorptive, $c\bar c-N$ cross section controls the suppression and also shadowing of gluons appears. We propose that the growth of the coherence length can explain the x_F-dependence of present experimental data. For this, we need a ratio of absorptive over total $c\bar c-N$ cross section of 0.2.
Spectrophotometric Determination of the pKa, Isosbestic Point and Equation of Absorbance vs. pH for a Universal pH Indicator  [PDF]
L. E. Vidal Salgado, C. Vargas-Hernández
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.517135
Abstract: The pKa and the isosbestic point of the universal pH indicator Carlo Ebra 1-11 (catalog number 45712) were determined using UV-Vis spectrophotometry. Aqueous buffer solutions with pHs ranging from 3.83 to 10.85 were mixed. Four methods—two graphical and two mathematical— were used to estimate the acid dissociation constant (pKa) and isosbestic point using absorbance measurements. The equation for the dependence of the absorbance on pH at λ = 600 nm was obtained using calibration curves. The resulting average pKa of the four methods was 8.277 with a standard deviation of 0.1728. The results obtained using the mathematical methods were very similar, with a deviation of 0.0014; the average pKa determined using these methods was 8.263 ± 0.001. The literature contains no previous reports of the pKa of this indicator. The isosbestic point occurs at a wavelength of 494 nm, with an absorbance of 0.46.
SYNTHESIS AND CHARACTERIZATION OF BIMETALLIC AuAg COLLOIDS AND FILMS
CáRDENAS,GALO; SALGADO,ELIZABETH;
Journal of the Chilean Chemical Society , 2006, DOI: 10.4067/S0717-97072006000400009
Abstract: bimetallic colloids of auag were prepared by simultaneous cocondensation of the metals with organic solvents at 77k. the metals are evaporated to yield atoms at 77k, which produced the alloy and upon warming, relatively stable liquid colloids are formed with a narrow and nanometric particle size depending on the solvent. the bimetallic colloids were characterized by several studies, including the stability at room, temperature, particle size, transmission electron microscopy (tem) with energy dispersive x-ray (edax). the solvents under study were: acetone, 2-butanone, 2-methoxyethanol, 2-ethoxyethanol, 2-propanol and thf. the colloids are negatively charged. the particle size growth was slow and sizes from 100 to 220 nm were obtained. the ft-ir studies of the films prepared by evaporation of the solvents showed the incorporation of the solvents. the edax studies showed the presence of au and ag metals. the thermogravimetric studies of the auag films showed a low stability inacetone but an increase inthf and 2-propanol with td = 475°c and 400 °c, respectively
SYNTHESIS AND CHARACTERIZATION OF BIMETALLIC AuAg COLLOIDS AND FILMS
GALO CáRDENAS,ELIZABETH SALGADO
Journal of the Chilean Chemical Society , 2006,
Abstract: Bimetallic colloids of AuAg were prepared by simultaneous cocondensation of the metals with organic solvents at 77K. The metals are evaporated to yield atoms at 77K, which produced the alloy and upon warming, relatively stable liquid colloids are formed with a narrow and nanometric particle size depending on the solvent. The bimetallic colloids were characterized by several studies, including the stability at room, temperature, particle size, transmission electron microscopy (TEM) with energy dispersive X-ray (EDAX). The solvents under study were: acetone, 2-butanone, 2-methoxyethanol, 2-ethoxyethanol, 2-propanol and THF. The colloids are negatively charged. The particle size growth was slow and sizes from 100 to 220 nm were obtained. The FT-IR studies of the films prepared by evaporation of the solvents showed the incorporation of the solvents. The EDAX studies showed the presence of Au and Ag metals. The thermogravimetric studies of the AuAg films showed a low stability inacetone but an increase inTHF and 2-propanol with T D = 475°C and 400 °C, respectively
A geometrical estimation of saturation of partonic densities
N. Armesto,C. A. Salgado
Physics , 2000, DOI: 10.1016/S0370-2693(01)01153-4
Abstract: We propose a new criterium for saturation of the density of partons both in nucleons and nuclei. It is applicable to any multiple scattering model which would be used to compute the number of strings exchanged in $ep$ and $eA$ collisions. The criterium is based on percolation of strings, and the onset of percolation is estimated from expectations coming from the study of heavy ion collisions at high energies. We interpret this onset as an indication of saturation of the density of partons in the wave function of the hadron. In order to produce quantitative results, a particular model fitted to describe present HERA data and generalized to the nuclear case is used. Nevertheless, with the number of scatterings controlled by the relation between inclusive and diffractive processes, conclusions are weakly model-dependent as long as different models are tuned to describe the experimental data. This constitutes a new approach, based on the eikonal description of soft hadronic collisions, and different from others which employ either perturbative QCD ideas or semiclassical methods. It offers an alternative picture for saturation in the small $Q^2$ region.
Hyperon Enhancement in the Dual Parton Model
A. Capella,C. A. Salgado
Physics , 2000, DOI: 10.1088/1367-2630/2/1/330
Abstract: We review the two sources of hyperon enhancement in the dual parton model: strings originating from diquark-antidiquark pairs in the nucleon sea and net baryons containing two or three sea quarks with a yield controlled by the observed stopping. We show that adding final state interactions (including strangeness exchange reactions as well as the inverse reactions required by detailed balance) with a single averaged cross-section $\sigma=0.2$ mb, we can explain the observed hyperon enhancement in PbPb collisions at CERN SPS.
Baryon stopping and hyperon enhancement in the improved dual parton model
A. Capella,C. A. Salgado
Physics , 1999, DOI: 10.1103/PhysRevC.60.054906
Abstract: We present an improved version of the dual parton model which contains a new realization of the diquark breaking mechanism of baryon stopping. We reproduce in this way the net baryon yield in nuclear collisions. The model, which also considers strings originating from diquark-antidiquark pairs in the nucleon sea, reproduces the observed yields of p and Lambda and their antiparticles and underestimates cascades by less than 50 %. However, Omega's are underestimated by a factor five. Agreement with data is restored by final state interaction, with an averaged cross-section as small as 0.14 mb. Hyperon yields increase significantly faster than antihyperons, in agreement with experiment.
Apoptosis in TMJ Disc Diseases  [PDF]
Giuseppe Musumeci, Carla Loreto
Open Journal of Apoptosis (OJApo) , 2013, DOI: 10.4236/ojapo.2013.24007
Abstract: Apoptosis in TMJ Disc Diseases
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