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Search Results: 1 - 10 of 7968 matches for " Claudio; Cisneros "
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Peculiaridades Anatómicas del Canal Semicircular Superior y su Posible Implicancia Clínica Anatomical Peculiarities of the Superior Semicircular Canals and its Possible Clinical Implication
Jaime Whyte,Claudio Martínez,Ana Cisneros,Ana Whyte
International Journal of Morphology , 2012,
Abstract: El objetivo fue estudiar las peculiaridades en la morfología apical del canal semicircular superior, a nivel de la eminencia arcuata con la finalidad de obtener conclusiones aplicativas. Se estudiaron 48 cabezas de cadáveres humanos (96 huesos temporales), con la intención de identificar la presencia de adelgazamiento o dehiscencia del canal semicircular superior, así como la existencia de surcos vasculares de la eminencia acuata que, discurriendo sobre el techo del canal, pudieran afectar a su integridad anatómica. El estudio incluye un análisis histológico (Tricrómico de Martins) y radiológico (Tomografía Computarizada) de los hallazgos positivos (dehiscencias y adelgazamientos), así como estudio tomográfico de los canales con surcos vasculares visibles. En un caso (1,04 %) hemos observado cómo el canal presentaba un defecto óseo completo (dehiscencia), en tres (3,12%) el canal presentaba una pared muy delgada cuyo grosor no excedía de 0,2 mm. En 12 casos (12,5%) la eminencia arcuata estaba recorrida por surcos por el que discurrían vasos colaterales meníngeos, que determinaron una concavidad entre 0,1 y 0,2 mm, mientras que el grosor medio de dicha pared en estos casos fue de 1,2 mm. De las tres peculiaridades estudiadas, la falta de cobertura ósea es la que produce el síndrome de dehiscencia del canal semicircular superior. Los canales que presentaban una cubierta adelgazada pueden estar predispuestos a una rotura y por lo tanto causar patología en el canal. En cambio la presencia de surcos vasculares que recorren la superficie apical del canal, no parece tener consecuencias al disminuir minimamente su grosor. The aim was to study the peculiarities in apical morphology of the superior semicircular canal are studied at level of the arcuate eminence to obtain application conclusions. We have studied 48 heads from human cadavers (96 temporal bones), with the intention of identifying the presence of thinning or dehiscence in the superior semicircular canal, as well as the existence of vascular sulci of the arcuate eminence, which, traveling along the roof of the canal, may affect its anatomical integrity. The study includes a histological (Martin's Trichome method) and a radiological analysis (Computerized Tomography) of the findings (dehiscences and thinnings), and as well as tomographic study of the canals with visible vascular sulci. In one case (1.04 %) we have observed how the canal presented a complete bone defect (dehiscence), in three (3.12%), presented a very thin wall, which did not exceed 0.2 mm thick. In 12 cases (12.5%) sulci covered the ar
Peculiaridades Anatómicas del Canal Semicircular Superior y su Posible Implicancia Clínica
Whyte,Jaime; Martínez,Claudio; Cisneros,Ana; Whyte,Ana; Crovetto,Miguel ángel;
International Journal of Morphology , 2012, DOI: 10.4067/S0717-95022012000300062
Abstract: the aim was to study the peculiarities in apical morphology of the superior semicircular canal are studied at level of the arcuate eminence to obtain application conclusions. we have studied 48 heads from human cadavers (96 temporal bones), with the intention of identifying the presence of thinning or dehiscence in the superior semicircular canal, as well as the existence of vascular sulci of the arcuate eminence, which, traveling along the roof of the canal, may affect its anatomical integrity. the study includes a histological (martin's trichome method) and a radiological analysis (computerized tomography) of the findings (dehiscences and thinnings), and as well as tomographic study of the canals with visible vascular sulci. in one case (1.04 %) we have observed how the canal presented a complete bone defect (dehiscence), in three (3.12%), presented a very thin wall, which did not exceed 0.2 mm thick. in 12 cases (12.5%) sulci covered the arcuate eminence through which meningeal collateral vessels ran, which determined a concavity of between 0.1 and 0.2 mm, whilst the average thickness of this wall in these cases was 1.2 mm. of the peculiarities studied, the lack of bone coverage is what produces the dehiscence syndrome of the superior semicircular canal. the canals that had a reduced coverage may be predisposed to breakage and therefore cause pathology in them. on the other hand, the presence of vascular sulci that ran along the apical surface of the canal seems to have no consequences to decrease their thickness.
Dehiscencia del canal semicircular superior: Estudio de la incidencia anatómica Dehiscence in the superior semicircular canal: Anatomic incidence study
Jaime Whyte O,Claudio Martínez M,Ana Cisneros G,Jesús Obón N
Revista de Otorrinolaringología y Cirugía de Cabeza y Cuello , 2011,
Abstract: Introducción: La presencia de dehiscencia de canal semicircular superior presenta una notable diferencia entre la incidencia radiológica (del 1% al 19%) y la anatómica (entre 0,4% y 0,6%). Objetivo: El objetivo del trabajo es determinar la incidencia anatómica de la dehiscencia del canal semicircular superior y compararla con la incidencia radiológica. Material y método: Se estudia la incidencia de dehiscencia de canal semicircular superior en 80 cráneos (160 temporales). Resultados: Hemos observado la presencia de una dehiscencia del canal semicircular superior en un cráneo de los 80 estudiados, lo que representó una incidencia del 0,6%. Se discute las posibles causas porque la prevalencia de los estudios radiológicos es marcadamente superior a la de los estudios anatómicos. Conclusión: Es evidente que se realiza un "sobrediagnóstico" de dehiscencias del canal semicircular superior ya que los hallazgos anatómicos están muy lejos de los resultados obtenidos con técnicas de imagen. Introduction: The presence of dehiscence in the superior semicircular canal shows a remarkable difference between radiological (from 1%% to 19%%) and anatomical incidence (between 0,4% and 0,6%) Aim: To determine the incidence anatomical superior semicircular canal dehiscence. Material and method: The incidence of dehiscence in superior semicircular canal in 80 skulls (160 temporal bones) is studied. Results: We have observed the presence of one dehiscence in the superior semicircular canal in one skull from the 80 studied, representing an incidence of 0.6%. The possible causes are discussed because of the prevalence of the radiological studies is highly superior to anatomical studies. Conclusion: It is obvious the over-diagnosis performed about the dehiscences in the superior semicircular canal since anatomical finds are quite different from the results obtained by means of image technics.
RENDIMIENTO POBLACIONAL DEL ROTíFERO NATIVO Brachionus sp. "Cayman", UTILIZANDO DIFERENTES ENRIQUECEDORES
Rosario Cisneros
Ecología Aplicada , 2011,
Abstract: Los rotíferos Brachionus spp. son cultivados y utilizados como alimento vivo para larvas de peces y crustáceos en todo el mundo. Con el objetivo de evaluar el rendimiento poblacional del rotífero nativo Brachionus sp."Cayman", cepa Chilca, Perú, se realizó una prueba de enriquecimiento largo, utilizando cuatro enriquecedores/suplementos alimenticios comerciales, Marol-E, Protein Hufa, Selcon e Easy Super Selco, así como la microalga Nannochloropsis oculata sin suplemento, como control. Cada tratamiento se realizó por triplicado en tanques de 180 litros. Se determinó la fecundidad (F), tasa de crecimiento poblacional (TC) y productividad (R) obtenida con cada tratamiento. El ANOVA mostró diferencias estadísticas entre los tratamientos, el enriquecedor Protein Hufa presento mejores resultados en cuanto a F (0.65±0.03 huevos.indiv- 1), densidad final (149±0.58 indiv.mL-1), TC (0.38±0.02 día-1) y R (29 250±0.66 rot.L-1.día-1).
Discurso en la ceremonia de entrega del Premio Iberoamericano de Letras "José Donoso", 2004: DISCURSO AL RECIBIR EL PREMIO "JOSé DONOSO" 2004
Antonio Cisneros
Universum : Revista de Humanidades y Ciencias Sociales , 2005,
Abstract:
Ramírez, R. (2010) Didácticas de la lengua y de la argumentación escrita
Mireya Cisneros
Revista Signos , 2012,
Abstract:
A FORTRAN coded regular expression Compiler for IBM 1130 Computing System
Gerardo Cisneros
Computer Science , 2009,
Abstract: REC (Regular Expression Compiler) is a concise programming language which allows students to write programs without knowledge of the complicated syntax of languages like FORTRAN and ALGOL. The language is recursive and contains only four elements for control. This paper describes an interpreter of REC written in FORTRAN.
Dehiscencia del canal semicircular superior: Estudio de la incidencia anatómica
Whyte O,Jaime; Martínez M,Claudio; Cisneros G,Ana; Obón N,Jesús; Gracia-Tello,Borja; Crovetto D,Miguel ángel;
Revista de otorrinolaringología y cirugía de cabeza y cuello , 2011, DOI: 10.4067/S0718-48162011000100006
Abstract: introduction: the presence of dehiscence in the superior semicircular canal shows a remarkable difference between radiological (from 1%% to 19%%) and anatomical incidence (between 0,4% and 0,6%) aim: to determine the incidence anatomical superior semicircular canal dehiscence. material and method: the incidence of dehiscence in superior semicircular canal in 80 skulls (160 temporal bones) is studied. results: we have observed the presence of one dehiscence in the superior semicircular canal in one skull from the 80 studied, representing an incidence of 0.6%. the possible causes are discussed because of the prevalence of the radiological studies is highly superior to anatomical studies. conclusion: it is obvious the over-diagnosis performed about the dehiscences in the superior semicircular canal since anatomical finds are quite different from the results obtained by means of image technics.
Paleoclimate reconstruction during MIS5a based on a speleothem from Nerja Cave, Málaga, South Spain  [PDF]
C. Jiménez de Cisneros, E. Caballero
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.55067
Abstract:

Speleothems from Nerja Cave in southern Spain provide a record during interglacial period MIS5a. Period of speleothem deposition occurred from 70,000 90,000 yr ago. Oxygen (δ18O) and hydrogen (δD) isotope ratios of speleothem and fluid inclusions enable the reconstruction of climatic variability in this region of southern Spain. Fluid inclusions trapped in speleothems represent samples of drip water from which the speleothems grew. The isotopic compositions of cave dripwaters approximate average annual δ18O and δD of precipitation, therefore δ18O can be calculated from D/H of inclusion water using the MWL relationship δD = 8δ18O + 10. The measurements of the δD values of fluid-inclusion water and δ18O values from speleothems have been applied to paleoclimate reconstruction in Southern Spain indicating a colder condition than at present.

Oxygen Isotopic Fractionation in the Kaolinite-Water System during the Synthetic Process  [PDF]
E. Caballero, C. Jiménez de Cisneros
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2018, DOI: 10.4236/jmmce.2018.64036
Abstract: Oxygen isotope fractionation is studied during the synthesis of kaolinite under controlled conditions of temperature and time. Equilibrium conditions have been established and its relationship with temperature has been studied. Kaolinite was hydrothermally precipitated starting from non-crystalline aluminosilicate gels. The amount of kaolinite obtained increases up to a limited constant value and in all cases coexists with the amorphous starting gels. It can be seen that the data obtained at 48 hours of synthesis can be considered as quasi-equilibrium, since the total isotopic equilibrium has not been reached, only the sample obtained at 24 hours should be discarded for studies in equilibrium. This would allow us, with the samples obtained at 720 hours, to try to establish a relationship between isotopic fractionation and temperature, provided that we know the water in equilibrium with the synthesized kaolinite. Two equations have been obtained that show correlation coefficients with a high statistical significance.
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