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Search Results: 1 - 10 of 542539 matches for " C. M. Mateo "
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Effect of temperature and storage time of wheat germ on the oil tocopherol concentration
Capitani, M.;Mateo, C. M.;Nolasco, S. M.;
Brazilian Journal of Chemical Engineering , 2011, DOI: 10.1590/S0104-66322011000200008
Abstract: wheat germ represents approximately 3% of the grain and it contains 8-14% oil, which is a rich source of tocopherols (vitamin e) and polyunsaturated fatty acids, mainly linoleic acid. the present work shows the influence of temperature (27oc and 45oc) and storage time (maximum 35 days) of the wheat germ on the concentration of tocopherol in the oil. their effect on other quality parameters was also investigated. results indicated that oil oxidation and free fatty acid formation increased markedly with temperature and storage time. the initial sample contained 3134 μg/g total tocopherol, of which 67% was α-tocopherol and, in a lower proportions, β-tocopherol and γ-tocopherol (30.5% and 2.4%, respectively). in the temperature range studied, tocopherols decreased as a function of storage time following first-order kinetics. the rate constant k for β-tocopherol increased with temperature. the fatty acid composition was not affected by the storage conditions applied.
Thermal Decomposition Reaction of Acetophenone Cyclic Diperoxide in Solvents of Different Physicochemical Properties
C. M. Mateo,A. I. Ca?izo,G. N. Eyler
Molecules , 2000, DOI: 10.3390/50300365
Abstract: The thermal decomposition reaction of acetophenone cyclic diperoxide (trans-3,6-dimethyl-3,6-diphenyl-1,2,4,5-tetroxane; APDP) at the initial concentration of c.a. 0.01 mol kg-1 and temperature ranges of 135.5 to 185.0° C has been investigated in dioxane and acetonitrile solutions, and in an 2-propanol/benzene mixture.
QUIMIOTERAPIA COMBINADA NEOADYUVANTE SEGUIDA DE RADIOTERAPIA EXTERNA EN EL TRATAMIENTO DE DOS CASOS DE LINFOMA PRIMARIO DEL CUELLO UTERINO
Bravo S.,Marco; Heredia M.,Fernando; Pierotic C.,Mateo;
Revista chilena de obstetricia y ginecología , 2005, DOI: 10.4067/S0717-75262005000200006
Abstract: background: primary extranodal lymphomas of the genital tract are rare. cases: as there is no current consensus in its management, we present two further cases and their treatment with neoadyuvant chemotherapy, followed by radiation therapy. a radical hysterectomy with bilateral pelvic lymphadenectomy was performed after primary treatment in one case. clinical response was complete in both cases and pathological response was documented in one. conclusions: complete response of these lymphoid neoplasms can be achieved by neoadyuvant chemotherapy followed by external irradiation
QUIMIOTERAPIA COMBINADA NEOADYUVANTE SEGUIDA DE RADIOTERAPIA EXTERNA EN EL TRATAMIENTO DE DOS CASOS DE LINFOMA PRIMARIO DEL CUELLO UTERINO
Marco Bravo S.,Fernando Heredia M.,Mateo Pierotic C.
Revista Chilena de Obstetricia y Ginecología , 2005,
Abstract: Los linfomas primarios del cuello uterino son poco frecuentes. Dado que no hay esquemas de manejo definido, presentamos 2 nuevos casos tratados y controlados desde 1999 a la fecha en la Fundación Arturo López Pérez. El tratamiento consistió en quimioterapia combinada neoadyuvante seguida de radioterapia externa. Se verificó respuesta clínica y radiológica completa en ambos casos. Conclusión: Se puede lograr respuesta completa de estas neoplasias linfoides con esta modalidad de tratamiento Background: Primary extranodal lymphomas of the genital tract are rare. Cases: As there is no current consensus in its management, we present two further cases and their treatment with neoadyuvant chemotherapy, followed by radiation therapy. A radical hysterectomy with bilateral pelvic lymphadenectomy was performed after primary treatment in one case. Clinical response was complete in both cases and pathological response was documented in one. Conclusions: Complete response of these lymphoid neoplasms can be achieved by neoadyuvant chemotherapy followed by external irradiation
Dynamics of the Globular Cluster NGC 362
P. Fischer,D. L. Welch,M. Mateo,P. C?té
Physics , 1993, DOI: 10.1086/116743
Abstract: In this paper we have examined the internal dynamics of the globular cluster NGC 362. A V band surface brightness profile (SBP) was constructed from CCD images, and, after it was determined that the cluster is not post core-collapse, fit with single- and multi-mass King-Michie (KM) models. The total cluster luminosity is 1.70 $\pm 0.1 \times 10^5$ L$_V$\sol. A total of 285 stellar spectra were obtained of 215 stars for radial velocity determinations. Four stars showed strong evidence for radial velocity variations and are probably members of binary systems. The true cluster binary fraction was determined from simulations to be 0.15 for circular orbits or 0.27 for orbits with a distribution function $f(e) = e$ ($e$ is eccentricity). This relatively high binary detection frequency may indicate that NGC 362 is overabundant in binaries compared to other clusters. The 208 remaining stars showed no sign of rotation. The best agreement with both the kinematic data and the SBP were for shallow mass functions $x = 0.0 - 0.5$ and intermediate amounts of anisotropy in the velocity dispersion tensor. The cluster mass is M = $2.5 - 3.5 \times 10^5$ M\sol\ for a global mass-to-light ratio of M/L$_V$ = 1.5 - 2.0 M\sol/L$_V$\sol. This low value for $x$ is in disagreement with the correlation between $x$ and the height above the Galactic disk seen for a sample of other clusters. The results are also different from the sharp turn-up in the low mass end of mass functions derived from some deep luminosity functions of three other globular clusters.
Efectos del sistema de pedaleo no circular Q-Ring sobre el rendimiento en el sprint de la disciplina ciclista BMX Effects of the Q-Ring non-circular pedaling system on sprint performance in the BMX cycling discipline
M. Mateo,C. Blasco-Lafarga,E. Fernández-Pe?a,M Zabala
Motricidad : European Journal of Human Movement , 2010,
Abstract: El objetivo de este estudio ha sido evaluar los efectos de un sistema de plato no circular de desarrollo variable Q-Ring (Q) frente a uno convencional (NQ) sobre el rendimiento en el sprint ciclista de Bicicleta de Moto Cross (BMX). Catorce deportistas pertenecientes a la Selección Nacional Espa ola han realizado un test de sprint, desde la rampa de salida, en una pista de BMX (3.95 s de duración; orden randomizado y contrabalanceado). El análisis de contraste prueba T para muestras relacionadas no muestra diferencias estadísticamente significativas para las variables Velocidad media (Vmedia) y Tiempo en 31m (T31m) entre Q y NQ cuando considera al grupo en su conjunto. Sin embargo, al dividir la muestra entre deportistas Expertos y Noveles, encontramos diferencias a favor de Q respecto de NQ entre los Expertos (Vmedia: 5.91±0.03 vs 5.81±0.05 m/s; T31m: 3.21±0.02 vs 3.23±0.02 s; P < 0.05), diferencias que se traducen hasta en 40 cm de ganancia en los 3.95 primeros segundos de carrera. Estos resultados sugieren que el sistema Q mejora el rendimiento en el sprint de la especialidad ciclista BMX siempre que el deportista posea la capacidad de mover adecuadamente su desarrollo. Palabras clave: Eficiencia mecánica, plato no circular, pedaleo, rendimiento, sprint, BMX The aim of this study was to evaluate the possible benefits of using a non-circular chain-wheel system Q-Ring (Q) versus a conventional one (NQ) on the performance in the Bicycle Moto Cross (BMX) sprint cycling discipline. Fourteen riders belonging to the Spanish National Team performed a sprint test (3.95 s of duration, randomized and counterbalanced), from the starting gate ramp in a BMX track. The T-Test contrast analysis for related samples showed no statistically significant differences for the variables Average Speed (Vmean) and Time in 31m (T31m) between Q and NQ, when considering the group as a whole. However, when the analysis considered two groups separately: Experts vs Novice, we found significant differences for Q vs NQ within the Experts (Vmean: 5.91±0.03 vs.5.81±0.05 m/s; T31m: 3.21±0.02 vs 3.23 ± 0.02 s; P <0.05); what meant an improvement up to 40 cm in the distance covered within this first 3.95 seconds. Hence, our results suggest that the non-circular chain-wheel system Q-Ring improves sprint performance in BMX, provided the riders have a conditional level enough to ensure the capacity to develop the pedaling properly, despite of the strength needed. Key Words: Mechanical efficiency, non-circular, pedaling, performance, sprint, BMX
Effect of Substituents on the O-O Bond Rupture of Different Organic Peroxides in Toluene Solution
G. N. Eyler,A. I. Ca?izo,C. M. Mateo,E. E. Alvarez,R. K. Nesprías
Molecules , 2000, DOI: 10.3390/50300360
Abstract: The thermal decomposition reaction of cyclic organic peroxides was studied in toluene solution in a wide temperature range. The kinetic data show an important substituent effect on the unimolecular homolysis of the O-O bond of these molecules.
UNA SALACUNA PARA LOS PECES ARRECIFALES DEL ARCHIPIéLAGO DE SAN BERNARDO, CARIBE COLOMBIANO
Báez,Diana P; Márquez,Juan C; López-Victoria,Mateo;
Boletín de Investigaciones Marinas y Costeras - INVEMAR , 2002,
Abstract: during six months visual censuses were carried out in two mangrove lagoons in tintipán island, colombian caribbean. twenty-six species of juvenile reef fishes were observed, some of them with economical importance in the region. the importance of the lagoons as nurseries for fishes is presented and one dynamite illegal fishing event is reported.
Efecto del vanadio en la forja en tibio de un acero con contenido medio de carbono
García-Mateo, C.,Romero, J. L.,Rodríguez-Ibabe, J. M.
Revista de Metalurgia , 1998,
Abstract: In the present work the influence of vanadium on the microstructure and mechanical properties of a medium carbon steel forged below 900°C is analysed. Undisolved V(CN) refines the microstructure and together with reprecipitated particles during cooling contribute to strengthening. Both effects maintain mechanical strength levels without decreasing toughness values. En el presente trabajo se analiza la influencia del vanadio en la microestructura y en la resistencia mecánica de un acero con contenido medio de carbono, tras ser deformado por compresión plana a temperaturas inferiores a 900°C. Los carbonitruros de vanadio no disueltos afinan la microestructura y junto a los reprecipitados durante el enfriamiento contribuyen al endurecimiento por precipitación, manteniendo la resistencia mecánica y logrando una tenacidad aceptable al bajar la temperatura de deformación.
Tratamiento de los melanomas cutáneos de la cabeza y el cuello: Estado actual The current state of treatment for cutaneous melanoma of the head and neck
P.M. Villarreal Renedo,J. Mateo Arias,C. álvarez Cuesta,E. Rodríguez Díaz
Revista Espa?ola de Cirugía Oral y Maxilofacial , 2005,
Abstract: Objetivo. Demostrar nuestra experiencia en el tratamiento del melanoma cutáneo de cabeza y cuello, así como en el estadiaje ganglionar regional a través de la detección y biopsia de los ganglios centinelas cervicofaciales. Métodos. Analizamos los casos de melanoma de cabeza y cuello tratados a lo largo de los últimos 3 a os. Los pacientes que nos fueron enviados con metástasis cervicofaciales fueron tratados mediante linfadenectomías cervicales acompa adas de parotidectomías si existían ganglios peri o intraparotídeos afectos. En los pacientes enviados sin resecar el tumor primario, tras la biopsia preoperatoria y el estudio de extensión, se realizó la identificación y exéresis de los ganglios centinelas cervicofaciales, la resección del primario y la reconstrucción del defecto creado mediante colgajos locorregionales. Resultados. El melanoma se asocia con un excelente pronóstico a largo plazo si se detecta y trata en estadios precoces. La técnica de la identificación y exéresis de los ganglios centinelas cervicofaciales es factible en los melanomas de cabeza y cuello. Conclusión. La técnica de detección y biopsia de los ganglios centinelas regionales se considera el procedimiento de elección para realizar el estadiaje ganglionar regional en el melanoma de cabeza y cuello. Permite aumentar la eficacia y sensibilidad del estudio histopatológico, al seleccionar los ganglios linfáticos cervicofaciales con mayor probabilidad de encontrar focos metastásicos. Objective. To demonstrate our experience in the treatment of head and neck cutaneous melanoma and the regional lymph nodes staging, by the sentinel lymph nodes biopsy technique. Methods. We analyze the cases of head and neck cutaneous melanoma treated during the last 3 years. Patients with cervical and/or facial metastases were treated by neck dissection plus parotidectomy if peripheral or intra-parotid nodes were affected. In the patients with primary tumours, a preoperatory biopsy and a whole body extension study were performed. After that, the cervical and facial sentinel lymph nodes and the primary tumour were resected. The defects created were reconstructed by means of local or regional cutaneous flaps. Results. Cutaneous melanoma associates with an excellent long-term prognosis when is detected and treated in a precocious stage. The cervical and facial sentinel lymph nodes biopsy technique is feasible in head and neck cutaneous melanomas. Conclusion. Sentinel node biopsy technique is considered the elective procedure for head and neck cutaneous melanoma regional staging. It improves the effectivene
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