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Search Results: 1 - 10 of 2711 matches for " CA;Villavicencio-Garayzar "
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Shark breeding grounds and seasons in the Gulf of California: Fishery management and conservation strategy
Salomón-Aguilar, CA;Villavicencio-Garayzar, CJ;Reyes-Bonilla, H;
Ciencias marinas , 2009,
Abstract: sharks show high biological fragility and, given the intense fishing regimes to which they are exposed in the gulf of california, it is necessary to establish a conservation and management strategy providing for the protection of their nursery areas. we reviewed the literature concerning shark reproductive biology to determine priority management areas in the gulf of california by complementarity analysis and different selection criteria. four levels of management and conservation priority were determined for six quadrants: level 1 corresponded to the area off mazatlán (sinaloa) and the area of el sargento, la ventana, and punta arenas (baja california sur); level 2 to the areas of teacapán (sinaloa) and seri (sonora); level 3 to the areas of san francisquito-el barril (baja california) and kino bay (sonora); and level 4 to the area of la manga (sonora). analysis of space-time variables in a geographic information system indicated that 71% of the commercially important shark species concentrate in coastal zones, mainly in bays, coastal lagoons, estuaries, and wetlands (central and southern gulf of california) during spring and summer (may-august), except for prionace glauca, isurus oxyrinchus, alopias pelagicus, and squatina californica that reproduce in winter and spring. the protection of recruitment areas (critical habitats) during peak breeding periods should be an essential part of any resource management plan.
Fetal mummification in silky shark (Carcharhinus falciformis) from the Gulf of California, Mexico
Sandoval-Castillo, Jonathan;Villavicencio-Garayzar, Carlos;
Brazilian Archives of Biology and Technology , 2008, DOI: 10.1590/S1516-89132008000300015
Abstract: the aim of this work was the description of fetal mummification in silky shark. during july of 2001 in santa maria fishing camp, gulf of california mexico, fourteen pregnant female of silky sharks were captured. in all of them the embryos were found to be dehydrated. however, total observations were possible in only two litters. six embryos in each analyzed litters were found. all the embryos were mummified, complete and without maceration. because the litters were totally mummificated in several females, it was suggested that fetal mummification was produced by the environmental condition.
Biología reproductiva de la cornuda común Sphyrna lewini Griffith & Smith (Sphyrnidae) en el Golfo de California
Torres-Huerta, Ana María;Villavicencio-Garayzar, Carlos;Corro-Espinosa, David;
Hidrobiológica , 2008,
Abstract: reproductive biology of scalloped hammerhead shark sphyrna lewini, was investigated in eight shark fishing camps in the gulf of california (mexico) from 1994 to 1996. a total of 1 693 specimens were determined total length (tl), total weight, sex and the gonadal maturity. the total length range was from 41 to 363 cm for females and from 43 to 290 cm for males. the sex proportion of embryos, neonates and juveniles in most of the cases was 1:1; however, this was not the case for adults, where the proportions varied at the sampling sites. sexual maturity was reached at 170 cm for males and 207 cm tl for females. the gestation period was 11 months and the highest fecundity was 32 embryos. the june births were between 41 and 53 cm tl. the presence of neonates, gravid females, and small juveniles in the east coast of the gulf of california and in la paz bay indicates that these areas are used as a nursery for s. lewini. in addition, the presence of male and female adults during the summer in the central and southeastern gulf of california suggests that these two places are important as mating areas.
Biología reproductiva de la cornuda común Sphyrna lewini Griffith & Smith (Sphyrnidae) en el Golfo de California Reproductive Biology of the Scalloped Hammerhead Shark Sphyrna lewini Griffith & Smith (Sphyrnidae) in the Gulf of California
Ana María Torres-Huerta,Carlos Villavicencio-Garayzar,David Corro-Espinosa
Hidrobiológica , 2008,
Abstract: Durante el período de 1994 a 1996 se obtuvieron datos de longitud total (LT), peso total, sexo y madurez gonádica de 1 693 individuos de Sphyrna lewini, capturados en ocho campos pesqueros de tiburón en el Golfo de California. En las hembras la longitud total tuvo un intervalo de 41 a 363 cm, mientras que en los machos fue de 43 a 290 cm. La proporción de sexos en embriones, neonatos y juveniles fue de 1:1, no así en adultos donde las proporciones variaron en las localidades de muestreo. Los machos y hembras alcanzaron la talla de primera madurez a los 170 y 207 cm de LT, respectivamente. El período de gestación tiene una duración aproximada de 11 meses y la fecundidad máxima fue de 32 embriones por hembra. El nacimiento de las crías ocurre en junio, con una talla entre 41 y 53 cm de LT. La presencia de neonatos y hembras grávidas durante el verano en la región central y sureste del Golfo de California sugiere que éstas son dos importantes áreas de nacimiento para la cornuda común en el Golfo de California. Mientras que, la costa este del Golfo de California y la Bahía de La Paz funcionan como área de crianza para los juveniles. Reproductive biology of scalloped hammerhead shark Sphyrna lewini, was investigated in eight shark fishing camps in the Gulf of California (Mexico) from 1994 to 1996. A total of 1 693 specimens were determined total length (TL), total weight, sex and the gonadal maturity. The total length range was from 41 to 363 cm for females and from 43 to 290 cm for males. The sex proportion of embryos, neonates and juveniles in most of the cases was 1:1; however, this was not the case for adults, where the proportions varied at the sampling sites. Sexual maturity was reached at 170 cm for males and 207 cm TL for females. The gestation period was 11 months and the highest fecundity was 32 embryos. The June births were between 41 and 53 cm TL. The presence of neonates, gravid females, and small juveniles in the east coast of the Gulf of California and in La Paz Bay indicates that these areas are used as a nursery for S. lewini. In addition, the presence of male and female adults during the summer in the central and southeastern Gulf of California suggests that these two places are important as mating areas.
Rabdomiosarcoma de oído en el ni o Rhabdomyosarcoma of the ear in a child
Esther Villavicencio Cordobés,Caridad Verdecia Ca?izares,Magda Alonso Pírez
Revista Cubana de Pediatr?-a , 2012,
Abstract: Los sarcomas de partes blandas son un grupo heterogéneo de tumores que se denominan así porque se originan en las estructuras que soportan el cuerpo o envuelven los órganos y tejidos. Dentro de los sarcomas de tejidos blandos, se encuentra el rabdomiosarcoma, que es la variedad más frecuente en Pediatría. A pesar de ser tumores raros, representan aproximadamente el 3 % de los tumores malignos pediátricos. Cuando se presentan, se localizan, en su mayoría, en la cabeza y el cuello, la vejiga, las vías biliares y la vagina. La localización en el oído medio es muy infrecuente. El objetivo de nuestro trabajo es presentar el caso de una paciente con esta localización del tumor, su evolución, y realizar una revisión del tema. Soft tissue sarcomas are a heterogeneous group of tumors that are so called because they occur in the structures supporting the body or lining the organs and tissues. Within this group, one may find the rhabdomyosarcoma that is the most frequent type in pediatrics. In spite of being rare tumors, they account for 3 % of pediatric malignant tumors. Most of them are located in the neck and the head, in the bladder, in the biliary ducts and in the vagina. Rhabdomyosarcoma of the middle ear is very uncommon. This paper was aimed at presenting a female patient with this type of tumor, her progression, and also a literature review on this topic.
Facts and Perceptions Regarding Software Measurement in Education and in Practice: Preliminary Results  [PDF]
Mónica Villavicencio, Alain Abran
Journal of Software Engineering and Applications (JSEA) , 2011, DOI: 10.4236/jsea.2011.44025
Abstract: How is software measurement addressed in undergraduate and graduate programs in universities? Do organizations consider that the graduating students they hire have an adequate knowledge of software measurement? To answer these and related questions, a survey was administered to participants who attended the IWSM-MENSURA 2010 conference in Stuttgart, Germany. Forty-seven of the 69 conference participants (including software development practitioners, software measurement consultants, university professors, and graduate students) took part in the survey. The results indicate that software measurement topics are: 1) covered mostly at the graduate level and not at the undergraduate level, and 2) not mandatory. Graduate students and professors consider that, of the measurement topics covered in university curricula, specific topics, such as measures for the requirements phase, and measurement techniques and tools, receive more attention in the academic context. A common observation of the practitioners who participated in the survey was that students hired as new employees bring limited software measurement-related knowledge to their organizations. Discussion of the findings and directions for future research are presented.
El gozo y la consagración del instante en El almuerzo del solitario de Efraín Jara Idrovo
VILLAVICENCIO,MANUEL;
Acta literaria , 2006, DOI: 10.4067/S0717-68482006000100006
Abstract: in el almuerzo del solitario, efraín jara idrovo (cuenca, 1926) conceives the everyday as something banal that impedes any attempt of a transcendance which is only possible to acheive by means of existencial intensification. it is a poem in which the poet tries to subject loneliness, time and death, consecrating their full acceptance by means of the enjoyment of simple pleasures and frugal gifts which induce the harmony of the subject withim himself and with the universe
República, nación y democracia ante el desafío de la diversidad
Villavicencio,Susana;
Estudios de filosof?-a pr??ctica e historia de las ideas , 2010,
Abstract: republic is not only the name of a nation and its regime. it is also a national model of integration based on a universalist conception of citizenship that sustains the abstract figure of the legal person, endowed with equal rights and obligations, and values of civism and civility, the foundation stones of a society that arises from a contract. this paper analyses how the emergency of the cultural diversity in argentina calls into question modern political concepts like republic, nation and democracy. it is also evaluated how the republic's inheritance, which supposes an homogenized sight of diversity, gives rise to an ambivalence among the adherence to universalist principles of the progress of humanity and the reality of an excluding democracy that gave value to one culture above others. the narratives of national identity are studied describing how the opposition between civilization and barbariy affects the way latin americans see the great challenges presented by the future of democracy, and by the recognition of the plurality of cultural allegiances.
LA CONCEPCIóN POLíTICA DE LA PERSONA Y LAS VISIONES CONSTITUTIVAS DEL BIEN
VILLAVICENCIO,LUIS;
Ideas y Valores , 2007,
Abstract: this article analyzes whether the strategy displayed by rawls starting with the dewey lectures makes it possible to overcome the comprehensive character that some critics attribute to his political conception of person. after describing said conception, the paper reviews the objection that it is incompatible with those conceptions of the good that attribute a constitutive character to attachments and ends. finally, it is concluded that although the distinction between political and comprehensive liberalism is unstable, it is compatible with constitutive conceptions of the good.
CIUDADANíA Y CIVILIDAD: acerca del derecho a tener derechos
Villavicencio,Susana;
Colombia Internacional , 2007,
Abstract: in a context of neoliberalism and deepening socioeconomic inequality in latin america, the author analyzes the concept of citizenship and its articulation with the concept of civility. citizenship has been defined as a status that guarantees rights and duties, liberties and restrictions, and powers and responsibilities to equal individuals. this is why the concept of citizenship occupies a central place in democratic politics. but exclusion, growing inequality and the absence of conditions for the exercise of rights shows that the concept of citizenship is insufficient and reveals a gap to fill.the need to link this concept to the expectations of recognition contained in the idea of civility leads the author to ask for the paradoxes of liberal democracy, and to question the existing gap between ideal rights and their actual exercise, which points to the extent of the task of developing a real democracy.
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