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Search Results: 1 - 10 of 199769 matches for " Domenico; Beltrán-Velarde "
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The contents of Cd, Cu, Pb and Zn of the white shrimp Litopenaeus vannamei (Boone, 1931) of six coastal lagoons of Sinaloa, NW Mexico
Frías-Espericueta,Martín G; Osuna-López,Isidro; Voltolina,Domenico; Beltrán-Velarde,Marco A; Izaguirre-Fierro,Gildardo; López-López,Gabriel; Muy-Rangel,Maria D; Rubio-Carrasco,Werner;
Revista de biología marina y oceanografía , 2009, DOI: 10.4067/S0718-19572009000100020
Abstract: abstract litopenaeus vannamei is the most important shrimp species in the traditional fishery of the coastal lagoons of the state of sinaloa (nw mexico), and most of the landings are consumed locally. since these lagoons receive important volumes of agricultural, industrial and urban effluents, consumption of this shrimp could pose risks to human health. the mean content of cd, cu, pb and zn determined in the hepatopancreas of shrimp from commercial landings from six lagoons of sinaloa were higher than those of the muscle. there was a weak correlation between the zn content of the two tissues (p≤0.05) and the correlations were not significant for cd, cu and pb (p>0.1). the concentrations found in the shrimp muscle were comparable or lower than those determined in commercial landings of different crustaceans from other geographic areas. according to our results the consumption of local shrimp poses no risks to human health.
Evolución de las ideas sobre la policitemia como mecanismo adaptativo a la altura
León-Velarde, Fabiola
Bulletin de l'Institut Francais d'études Andines , 1990,
Abstract: EVOLUTION DES IDEES SUR LA POLYCYTHEMIE EN TANT QUE MECANISME D ADAPTATION A L ALTITUDE. L auteur décrit, depuis la découverte il y a 100 ans de l augmentation des globules rouges en altitude, l évolution des idées sur les avantages adaptatifs de cet accroissement, et qui sont passées par plusieurs étapes d interprétation. Les premières recherches semblent indiquer que la diminution de l oxygène dans le sang due à la basse pression atmosphérique, pouvait être compensée par une augmentation des globules rouges. A cela, ont fait place des considérations sur les inconvénients de type physiologique que cette compensation pouvait entra ner. Enfin, il faut considérer le problème clinique qui élargit le concept de polycythémie excessive, du niveau de l individu à celui de la population qui conna t une adaptation incomplète à la vie en haute altitude. Se describe cómo en el curso de 100 a os desde el descubrimiento del aumento de glóbulos rojos en la altura, las ideas sobre las ventajas adaptativas de este incremento han pasado por varias etapas interpretativas. A la ventaja adaptativa que el sentido común parecía apoyar, basada en que la disminución del oxígeno en la sangre debido a la baja presión atmosférica, podía ser compensada por un aumento de glóbulos rojos, se sucedieron consideraciones sobre las desventajas de carácter fisiológico que esta compensación podría traer. A esto se agregó el problema clínico que extendió el concepto de policitemia excesiva de una entidad considerada del individuo a la reciente interpretación de la policitemia excesiva como una entidad de una población incompletamente adaptada a la vida en las grandes alturas. EVOLUTION OF IDEAS ON POLYCYTHEMIA AS AN ADAPTATIVE MECHANISM TO LIFE AT HIGH ALTITUDE. A description is made of the evolution of ideas on the interpretation of the adaptive value of an increase in red blood cells since this increase was discovered 100 years ago up to the present time. The first investigations carried out seemed to indicate that the reduction of the oxygen pressure in the blood due to the drop in barometric pressure with altitude could be compensated by an increase in the concentration of the red blood cells. This was followed by the appreciation of the physiological disadvantages of such an increase plus the finding that the clinical problems produced by the excessive increase in red cells was not a problem of the individual but represented the reduced adaptive capacity of human life at high altitudes.
Development of a Panel of Genome-Wide Ancestry Informative Markers to Study Admixture Throughout the Americas
Joshua Mark Galanter ,Juan Carlos Fernandez-Lopez,Christopher R. Gignoux,Jill Barnholtz-Sloan,Ceres Fernandez-Rozadilla,Marc Via,Alfredo Hidalgo-Miranda,Alejandra V. Contreras,Laura Uribe Figueroa,Paola Raska,Gerardo Jimenez-Sanchez,Irma Silva Zolezzi,Maria Torres,Clara Ruiz Ponte,Yarimar Ruiz,Antonio Salas,Elizabeth Nguyen,Celeste Eng,Lisbeth Borjas,William Zabala,Guillermo Barreto,Fernando Rondón González,Adriana Ibarra,Patricia Taboada,Liliana Porras,Fabián Moreno,Abigail Bigham,Gerardo Gutierrez,Tom Brutsaert,Fabiola León-Velarde,Lorna G. Moore,Enrique Vargas,Miguel Cruz,Jorge Escobedo,José Rodriguez-Santana,William Rodriguez-Cintrón,Rocio Chapela,Jean G. Ford,Carlos Bustamante,Daniela Seminara,Mark Shriver,Elad Ziv,Esteban Gonzalez Burchard,Robert Haile,Esteban Parra equal contributor,Angel Carracedo equal contributor,for the LACE Consortium
PLOS Genetics , 2012, DOI: 10.1371/journal.pgen.1002554
Abstract: Most individuals throughout the Americas are admixed descendants of Native American, European, and African ancestors. Complex historical factors have resulted in varying proportions of ancestral contributions between individuals within and among ethnic groups. We developed a panel of 446 ancestry informative markers (AIMs) optimized to estimate ancestral proportions in individuals and populations throughout Latin America. We used genome-wide data from 953 individuals from diverse African, European, and Native American populations to select AIMs optimized for each of the three main continental populations that form the basis of modern Latin American populations. We selected markers on the basis of locus-specific branch length to be informative, well distributed throughout the genome, capable of being genotyped on widely available commercial platforms, and applicable throughout the Americas by minimizing within-continent heterogeneity. We then validated the panel in samples from four admixed populations by comparing ancestry estimates based on the AIMs panel to estimates based on genome-wide association study (GWAS) data. The panel provided balanced discriminatory power among the three ancestral populations and accurate estimates of individual ancestry proportions (R2>0.9 for ancestral components with significant between-subject variance). Finally, we genotyped samples from 18 populations from Latin America using the AIMs panel and estimated variability in ancestry within and between these populations. This panel and its reference genotype information will be useful resources to explore population history of admixture in Latin America and to correct for the potential effects of population stratification in admixed samples in the region.
Culture of white shrimp (Litopenaeus vannamei Boone, 1931) with zero water exchange and no food addition: an eco-friendly approach
Audelo-Naranjo,Juan Manuel; Voltolina,Domenico; Romero-Beltrán,Emilio;
Latin american journal of aquatic research , 2012,
Abstract: juveniles (3.5 ± 0.3 g) of the white shrimp litopenaeus vannamei were grown during 40 days with no water exchanges, no food addition and four initial densities (25, 50, 75 and 100 g m-3, corresponding to between 8 and 32 shrimp m-2), to determine growth rates, which could be achieved using the periphyton growing on artificial substrates as the only food source. the experimental culture units were 12 polyethylene 1 m3 cylindrical tanks with 4.8 m2 of total submerged surface (bottom and walls), provided with 7.2 m2 of artificial substrate (aquamats?). there were no significant differences in the ammonia and nitrite concentrations determined in the four treatments (0.17-0.19 and 0.10-0.11 mg l-1, respectively), which remained below the respective levels of concern for shrimp cultures. mean survival was similar, and ranged from close to 91 to 97%, whereas there were significant differences in mean individual weight, which ranged from 11.9-10.6 g shrimp-1 for the two low initial densities (25 y 50 g m-3), to 8.3-7.7 g shrimp-1 for the other treatments. however, because of the high survival and of the higher initial density, the best biomass yield was with 100 g m-3. the final nitrogen contents of sediment and water were lower than the initial values, and between 36 and 60% of the difference was converted into shrimp biomass.
Culture of white shrimp (Litopenaeus vannamei Boone, 1931) with zero water exchange and no food addition: an eco-friendly approach Cultivo de camarón blanco (Litopenaeus vannamei Boone, 1931) sin recambio de agua y sin adición de alimento formulado: un sistema amigable con el ambiente
Juan Manuel Audelo-Naranjo,Domenico Voltolina,Emilio Romero-Beltrán
Latin american journal of aquatic research , 2012,
Abstract: Juveniles (3.5 ± 0.3 g) of the white shrimp Litopenaeus vannamei were grown during 40 days with no water exchanges, no food addition and four initial densities (25, 50, 75 and 100 g m-3, corresponding to between 8 and 32 shrimp m-2), to determine growth rates, which could be achieved using the periphyton growing on artificial substrates as the only food source. The experimental culture units were 12 polyethylene 1 m3 cylindrical tanks with 4.8 m2 of total submerged surface (bottom and walls), provided with 7.2 m2 of artificial substrate (Aquamats ). There were no significant differences in the ammonia and nitrite concentrations determined in the four treatments (0.17-0.19 and 0.10-0.11 mg L-1, respectively), which remained below the respective levels of concern for shrimp cultures. Mean survival was similar, and ranged from close to 91 to 97%, whereas there were significant differences in mean individual weight, which ranged from 11.9-10.6 g shrimp-1 for the two low initial densities (25 y 50 g m-3), to 8.3-7.7 g shrimp-1 for the other treatments. However, because of the high survival and of the higher initial density, the best biomass yield was with 100 g m-3. The final nitrogen contents of sediment and water were lower than the initial values, and between 36 and 60% of the difference was converted into shrimp biomass. Durante 40 días se cultivaron juveniles de camarón blanco Litopenaeus vannamei con un peso individual de 3,5 ± 0,3 g y biomasas iniciales de 25, 50, 75 y 100 g m-3 (equivalente a 8-32 ind m-2), sin cambios de agua y adición de alimento, para determinar la tasa de crecimiento usando como única fuente de alimentación el perifiton desarrollado en sustratos artificiales. Se utilizaron estanques cilíndricos de polietileno de 1 m3 con tres réplicas por tratamiento, con una superficie de 4,8 m2 (paredes y fondo) y 7,1 m2 de sustrato artificial (Aquamats ). No se encontraron diferencias significativas entre las concentraciones de amonio (0,17-0,19 mg L-1) y nitrito (0,10-0,11 mg L-1) determinadas en los cuatro tratamientos. La supervivencia fue similar, variando entre 91 y 97%. La ganancia en peso individual fue significativamente mayor en los tratamientos con menor biomasa inicial (25 y 50 g m-3), aunque por la mayor densidad inicial, el mejor rendimiento en biomasa se observó en los cultivos sembrados con 100 g m-3. Los contenidos de nitrógeno determinados al final del experimento, en el agua y sedimento, fueron inferiores a los valores iniciales, y entre el 36 y 60% de sus diferencias se recuperaron en biomasa de camarón.
Patrimonio industrial colombiano: la definición de paisajes productivos en la Sabana de Bogotá
Beltrán-Beltrán,Lina Constanza;
Apuntes: Revista de Estudios sobre Patrimonio Cultural - Journal of Cultural Heritage Studies , 2008,
Abstract: the understanding and acknowledgement of colombia's industrial legacy has been dominated by traditional perspectives that when drawing up inventories, enhance the individual object and rule out the dynamics of production that were developed and consolidated. as an alternative, this paper proposes an approach that combines the ideas about industrial heritage and cultural landscapes as a starting point to identify, value and bring together the tangible and intangible heritage of bogota's high plain productive history which gives its industrial cultural identity. as a methodology, three productive processes of which documentation from the pre-columbian era was available are studied and related mutually in three different periods, as part of a production process or as a result of exchange between different regions. the presence of water as a resource for production and distribution is included as a factor in the reconstruction of these landscapes. classifying these traces, three production landscapes were reconstructed, and methodologies are proposed for identifying and valuing the remains of production that could be part of the industrial heritage of colombia.
In Vitro Evaluation of Fasciolicide Activity with Hexane, Methanol and Ethyl Acetate with Extracts Processed and Obtained from Some Mexican Plants Used in Traditional Medicine Based on Ethno Botanical Studies  [PDF]
Stephanie Ibarra-Moreno, Froylán Ibarra-Velarde, José Guillermo ávila-Acevedo
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.34060
Abstract: Fasciolosis is a parasitic disease of world distribution affecting mainly domestic ruminants. The control of this disease is carried out using chemical fasciolicides which, in some cases, have been observed to have environmental problem such us pollution resistance. An alternative is to investigate extracts from plants with anti-Fasciola hepatica effects, taking advantage of the great diversity of flora of our country. The aim of this paper is to identify, assess and elucidate the anti-Fasciola hepatica effect in vitro using antiparasitic extracts of some plants used in Mexican ethno botany. We collected, dried, processed and tested in vitro about 20 plants with their respective chemical elements (hexane, ethyl acetate and methanol), obtaining results of a total of 60 extracts tested. The in vitro evaluations were carried out for 3 days, and the efficacy of each extract was compared with an untreated control group. Each test was repeated 6 times with 13 extracts that showed greater fasciolocide activity. Results from these 13 extracts tested ranged from 80% to 100% activity and the plants tested were: Castela tortuosa (chaparro amargo), Achillea millefolium (plumajillo), Thymus vulgaris (thyme), Justicia spicigera (muicle), Limpia critridora (cedron), Populus alba (Alamo), Mentha piperita (mint), Chenopodium graveolens (epazote de zorrillo), Lippia graveolens (oregano), Artemisia mexicana (estafiate) and Artemisia absinthium (wormwood), which is the hexane variable which showed higher fasciolicide capacity; using a dose of 500 gr/Lt in all the trials. Further in vitro studies should be conducted to obtain the LD50 of each extract to be able to isolate the main active element found in the hexane variable.
Rese a de "Notas para una agenda de investigación educativa regional" de Mario Rueda Beltrán (coordinador)
Jaime Rogelio Calderón López Velarde
Perfiles educativos , 2012,
Abstract:
In Vivo and in Vitro Evaluation of Permethrin, Cypermethrin or Zeta-Cypermethrin Mixed with Plant Extracts against Susceptible and Resistant (San Alfonso) Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) Strains  [PDF]
Froylán Ibarra-Velarde, Yazmin Alcala-Canto, Yolanda Vera-Montenegro
Pharmacology & Pharmacy (PP) , 2015, DOI: 10.4236/pp.2015.61005
Abstract: Acaricide resistance is a major problem that hinders the control of the cattle tick Rhipicephalus (Boophilus) microplus in Mexico. Permethrin (P), cypermethrin (C) and zeta-cypermethrin (Z) have been used to control R. (B.) microplus, and tick populations have developed resistance to these acaricides. The aim of the present study was to evaluate the effectiveness of a mixture containing P, C, or Z mixed with plant extracts through in vitro laboratory bioassays, using susceptible and triple resistant (San Alfonso) R. microplus strains. Untreated controls received only water. Results of laboratory bioassays using larval packet tests revealed an efficacy of 100% (P), 100% (Z), and 98.03% (C) using susceptible larvae, and an efficacy of 88.67% (P), 91.51% (C), and 99.27% (Z) on triple-resistant larvae. Egg laying, larvae hatching and efficacy was assessed using ticks collected from treated and untreated animals. Product Z produced a 92.04% efficacy on engorged ticks collected from experimentally-infested cattle, whereas C and P exerted 80.66% and 20.04% efficacy, respectively. Engorged females collected exclusively from control animals were challenged in vitro with the experimental products, and efficacy was as follows: 91.37% (Z), 85.95% (C), and 13.58% (P). Adding plant extracts to a pyrethroid formulation led to dramatic increases of percent reduction of both susceptible and resistant immature ticks in contrast to untreated larvae and susceptible adults. Results from this study may lead to suggesting the adoption of an acari-cide-botanical mixture strategy for tick control worldwide.
A framework for the construction of academic communities
Granados Beltrán,Carlo;
Folios , 2009,
Abstract: this article aims to explain how an academic community can be constructed based on teaching and research. for this purpose, first of all, a definition of academic community is provided; secondly, the way in which the building of this community can be done by fostering cooperative work, reflective teaching and teacher autonomy is described. in addition, the means by which students can take more active participation in this construction by engaging in critical thinking, learner autonomy and the implementation of a curriculum as inquiry are explained. finally, some tasks for the academic community are specified as well as its impact on the institutions and on the field of language teaching
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