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Search Results: 1 - 10 of 34241 matches for " Gerardo Zú?iga "
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Educación para el amor: una necesidad impostergable
Gerardo Alonso Steele Zú?iga
Revista Electrónica Educare , 2001,
Abstract: Resumen. Este artículo reconoce los esfuerzos hechos en Costa Rica, concernientes a la Educación Sexual. Se ala, también, el bajo nivel de logro en este campo, debido a la falta de coordinación entre las instituciones y las personas preocupadas por la Educación Sexual. Y lo más, importante, propone trabajar fuertemente en Educación para el Amor, enfatizando en los principios éticos y filosóficos del Amor, como los fundamentos de la educación de la sexualidad y el sexo. Abstract. This article acknowledges the effort done in the field of sexual education by several public entities in Costa Rica. It points out that the accomplishments of the plan implemented so far have not been those expected due to the lack of coordination among the institutions and the people concerned about the importance of sexual education. The author proposes as an option to strongly work in the implementation of a love education strategy, which would have as the backbone of sexuality and sex education, the ethical and philosophical principles of love.
Preliminary evaluation of the effect of juvenile hormone III and methyl farnesoate on spermatophore quality of the white shrimp, Litopenaeus vannamei Boone, 1931 (Decapoda: Penaeidae)
Alfaro,Jorge; Zú?iga,Gerardo; García,Andrea; Rojas,Ericka;
Revista de biología marina y oceanografía , 2008, DOI: 10.4067/S0718-19572008000100018
Abstract: este estudio preliminar es un primer paso en la exploración del efecto de la hormona juvenil iii (hj iii) y el metil farnesoato (mf) sobre la calidad de espermatóforos de litopenaeus vannamei. la hj iii aplicada cinco veces a una dosis de 109 ng g-1 de peso corporal (p.c.) durante 58 días, no mejoró el conteo de espermatozoides en comparación con el grupo control (p>0,05). la anormalidad de espermatozoides disminuyó en las regeneraciones sucesivas de espermatóforos de manera similar en machos tratados con hj y machos control (p>0,05). por el contrario, un total de cinco aplicaciones semanales de mf a 120 ng g-1 p.c. causó un incremento significativo en número de espermatozoides y una disminución en anormalidad de espermatozoides (p<0,05). una dosis mayor de mf (1200 ng g-1 p.c.) no causó un efecto significativo sobre la calidad de los espermatóforos (p>0,05)
Coexistencia de Dendroctonus frontalis Zimmerman y D. mexicanus Hopkins (Coleoptera: Scolytidae) sobre un mismo hospedero.
Gerardo Zú?iga,Ramón Cisneros,Yolanda Salinas
Acta zoológica mexicana , 1995,
Abstract:
Zonas de sobreposición en las áreas de distribución geográfica de las especies mexicanas de Dendroctonus Erichsson (Coleoptera: Scolytidae) y sus implicaciones ecológico-evolutivas
Gerardo Zú?iga,Guadalupe Mendoza,Ramón Cisneros,Yolanda Salinas
Acta zoológica mexicana , 1999,
Abstract:
Caracterización y clasificación de suelos con fines productivos en Córdoba, Veracruz, México
Francisco Bautista Zú?iga,Hilda Rivas Solórzano,Carmen Durán de Bazúa,Gerardo Palacio
Investigaciones geográficas , 1998,
Abstract:
Deep Near-Infrared Survey of the Pipe Nebula II: Data, Methods, and Dust Extinction Maps
Carlos Gerardo Román-Zú?iga,Jo?o F. Alves,Charles J. Lada,Marco Lombardi
Physics , 2010, DOI: 10.1088/0004-637X/725/2/2232
Abstract: We present a new set of high resolution dust extinction maps of the nearby and essentially starless Pipe Nebula molecular cloud. The maps were constructed from a concerted deep near-infrared imaging survey with the ESO-VLT, ESO-NTT, CAHA 3.5m telescopes, and 2MASS data. The new maps have a resolution three times higher than the previous extinction map of this cloud by Lombardi et al. (2006) and are able to resolve structure down to 2600 AU. We detect 244 significant extinction peaks across the cloud. These peaks have masses between 0.1 and 18.4 M_sun, diameters between 1.2 and 5.7e4 AU (0.06 and 0.28 pc), and mean densities of about 1e4 cm${^-3}$, all in good agreement with previous results. From the analysis of the Mean Surface Density of Companions we find a well defined scale near 1.4e4 AU below which we detect a significant decrease in structure of the cloud. This scale is smaller than the Jeans Length calculated from the mean density of the peaks. The surface density of peaks is not uniform but instead it displays clustering. Extinction peaks in the Pipe Nebula appear to have a spatial distribution similar to the stars in Taurus, suggesting that the spatial distribution of stars evolves directly from the primordial spatial distribution of high density material.
Lesión nodular de mama de crecimiento rápido
Sáenz-Batalla,Gerardo; Bogantes-Ledesma,Pilar; Lazo-Valladares,ángel; Zú?iga-Bastos,Alejandra;
Acta Médica Costarricense , 2008,
Abstract: pseudoangiomatous stromal hyperplasia of the breast is a rare benign disease, which was described by vuitch in 1986. the etiology is not clear, but an hormonal influence has been demonstrated. to confirm the diagnosis, a biopsy is required primarily to distinguish a malignant disease like low grade angyosarcoma, a fibroadenoma or a philloides tumor; these entities are similar in their clinical and imaging features. we present herein the case of a 40 year old female that presented with a fast growing, painful, recurrent breast mass, initially treated as fibrocystic breast disease but the histopathology later demonstrated the lesion to be a pseudoangiomatous stromal hyperplasia, which is very infrequent. finally she underwent a sucutaneuos mastectomy, and the diagnosis was again confirmed. an extensive review of current literature confirmed that mastectomy is better, especially in cases with diffuse and recurrent tumors.
Una aproximación a la regionalización sísmica del estado de Nuevo León, basada en velocidades de propagación de ondas de corte y evidencias geología
Montalvo Arrieta, Juan Carlos;Ramos Zú?iga, Luis Gerardo;Navarro de León, Ignacio;Ramírez Fernández, Juan Alonso;
Boletín de la Sociedad Geológica Mexicana , 2011,
Abstract: this paper presents the first seismic regionalization map for nuevo leon state, at a scale of 1:250 000. it was made using geological information and p and s wave propagation velocity data. seismic refraction methodology was used to obtain the wave velocity propagation. a total of 708 profiles were made on different geologic units that are included in the nuevo leon state type-lithological column. outcrops on which the profiles were carried out include sedimentary, igneous, and metamorphic rocks, and quaternary deposits. the generation of the seismic site conditions map is based on site effect codes, as proposed by the national earthquake hazards reduction program (nehrp, u.s.a.), from vs30 determination and its correlation with lithological information. the regionalization map using vs30, has revealed that a (vs30 > 1500 m/s), b (760 < vs30 ≤ 1500), and c (360 < vs30 ≤ 760) class sites predominate in the study area. areas characterized by alluvial material show lower values of vs30 (560 m/sec), whereas consolidated rocks, for example, those that constitute the mesozoic sequences, display high seismic wave velocity propagation values (vs30 = 1200 - 3500 m/s). the results obtained in this work provide a first approximation of the seismic response of shallow materials in the state, whose use is important in the land use planning, urban development and for the calculation of seismic risk and other geological perils, particularly for areas with historical evidence of seismic activity, but with little or no seismic instrumentation.
Lesión nodular de mama de crecimiento rápido A Nodular and Fast Growing Breast Mass
Gerardo Sáenz-Batalla,Pilar Bogantes-Ledesma,ángel Lazo-Valladares,Alejandra Zú?iga-Bastos
Acta Médica Costarricense , 2008,
Abstract: La hiperplasia estromal seudoangiomatosa es un hallazgo histológico benigno, relativamente infrecuente, caracterizada por aumento de la densidad mamaria, proliferación de fibras colágeno y del estroma que forma pseudoespacios capilares vacíos anastomosados entre sí. La etiología no es clara, pero tiene una marcada influencia hormonal. Tanto clínica como radiológicamente puede semejar lesiones benignas y malignas. La histología es fundamental para hacer el diagnóstico definitivo. Se reporta el caso clínico de una mujer herediana de 40 a os con una masa mamaria derecha, deformante, asimétrica, de crecimiento rápido, dolorosa y multirecidivante, que finalmente resolvió con una mastectomía subcutánea. Pseudoangiomatous stromal hyperplasia of the breast is a rare benign disease, which was described by Vuitch in 1986. The etiology is not clear, but an hormonal influence has been demonstrated. To confirm the diagnosis, a biopsy is required primarily to distinguish a malignant disease like low grade angyosarcoma, a fibroadenoma or a Philloides tumor; these entities are similar in their clinical and imaging features. We present herein the case of a 40 year old female that presented with a fast growing, painful, recurrent breast mass, initially treated as fibrocystic breast disease but the histopathology later demonstrated the lesion to be a pseudoangiomatous stromal hyperplasia, which is very infrequent. Finally she underwent a sucutaneuos mastectomy, and the diagnosis was again confirmed. An extensive review of current literature confirmed that mastectomy is better, especially in cases with diffuse and recurrent tumors.
Estudio de la anatomía e histología del tubo digestivo de Dendroctonus adjunctus Blandford (Coleoptera: Scolytidae).
Gerardo Zú?iga Bermúdez,Maria González Herrera,Héctor Fernández Arias,Ramón Cisneros Barrios
Acta zoológica mexicana , 1994,
Abstract:
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