oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 36 )

2018 ( 53 )

2017 ( 39 )

2016 ( 65 )

Custom range...

Search Results: 1 - 10 of 31995 matches for " Francisco Castillo Reyes "
All listed articles are free for downloading (OA Articles)
Page 1 /31995
Display every page Item
Identification of Potential Areas for Establishment of Plantations of Agave lechuguilla Torr. in Coahuila, Mexico  [PDF]
David Castillo-Quiroz, Oscar Ulises Martínez-Burciaga, Diana Yemilet ávila-Flores, Francisco Castillo-Reyes, Juan David Sánchez-Chaparro
Open Journal of Forestry (OJF) , 2014, DOI: 10.4236/ojf.2014.45056
Abstract: Adverse weather conditions and intensive use for fiber production have caused decline of natural populations of Agave lechuguilla. By these reasons, it is important to develop a sustainable management of this specie to avoid this situation. One of the first steps is to establish forest plantations as an alternative to restore A. lechuguilla habitat and increase its range while at the same time indirectly reducing erosion rates. The aim of this study was to identify the potential areas for establishment of plantations of A. lechuguilla in the State of Coahuila, Mexico. Areas for planting establishment were selected according to multi-criteria analysis using Geographic Information System (GIS) Idrisi32 Ver 2.0 and 3.2 Arc.View. The analysis was based on comparison of climate and soil requirements in contrast to environmental conditions of the tested area. The evaluated variables were: soil type, texture, depth, average annual temperature, annual precipitation, elevation and slope. Results derive in potential area maps, geo-referenced and their distribution by Agricultural Development District. An area of 5 million 159,273 hectares was determined with potential for establishment of A. lechuguilla forest plantations in the State of Coahuila. It was concluded that, use of GIS is a reliable tool to determine potential areas for A. lechuguilla forest plantations, where this specie has higher probability of success in survival and biomass production. This study will support programs aimed to strengthen the economy of rural producers and also recover and preserve the arid state.
Areas with Potential for Commercial Timber Plantations of Enterolobium cyclocarpum (Jacq.) Griseb. in Michoacán, México  [PDF]
Hipólito Jesús Mu?oz-Flores, J. Trinidad Sáenz-Reyes, Agustín Rueda-Sánchez, David Castillo-Quiroz, Francisco Castillo-Reyes, Diana Yemilet Avila-Flores
Open Journal of Forestry (OJF) , 2016, DOI: 10.4236/ojf.2016.65036
Abstract: Michoacán has a deforested area of 525,260 ha, representing 52,526 ha per year, mainly caused by anthropogenic disturbances such as agricultural burning and forest fires (50%), change of use of land for extensive livestock farming (28%), agriculture (17%) and illegal logging (5%). The establishment of forest plantations is an alternative for reducing the pressure on natural forests and creating options for sustainable development and diversification of production and conversion of land for agricultural and livestock fragmented for forestry purposes. The aim of this study was to determine the potential areas for commercial forest plantations of Enterolobium cyclocarpum (Jacq.) Griseb. in the State of Michoacán, México, through the use of Geographic information systems (GIS). Areas were identified using IDRISI 32, and ArcView software. Screening variables include annual temperature, annual precipitation, land use, soil type, elevation and slope. Products obtained were field verified. Two maps where potential areas for the establishment of commercial forest plantations of E. cyclocarpum shown were obtained. Potential areas for commercial forest plantation establishment are (0% - 15% slope) for commercial forest plantations mechanized was 57,227 ha and (15% - 30% slope) for manual plantations was 6273 ha. The total area in the state with potential for the establishment of the species in the study was 63,500 ha.
MEDICIONES ULTRASONOGRAFICAS Y DE TOMOGRAFIA COMPUTADA DE ADIPOSIDAD Y ALTERACIONES METABOLICAS ASOCIADAS A OBESIDAD EN NI?OS
Espinoza G,Aníbal; Reyes J,Marcela; Moraga M,Francisco; Rebollo G,M. Jesús; Mericq,Verónica; Castillo D,Carlos;
Revista chilena de radiología , 2006, DOI: 10.4067/S0717-93082006000400007
Abstract: introduction. childhood obesity is increasing over the world with serious health consequences. intraabdominal fat is associated to some metabolic alterations in obesity. it does not exist a standard imaging method to measure adipose tissue in children. objectives: in obese children to study the association between insulinemia and subcutaneous or intraabdominal fat evaluated by ultrasonographic (us) or computed tomography (ct). subjects and methods. 37 obese (bmi ? p95) prepubertal obese children (ages from 6 to 12 years) were assessed using anthropometric, us and ct for fat areas and linear intrabdominal segments measurements. laboratory techniques were also performed: insulinemia and glycemia. results. we found good correlations between us and tc intra-abdominal adipose tissue measurements (r= 0,79; p< 0,001). us (r=0.56) and ct (r=0.53) visceral fat assessment had better correlations with insulinemia than anthropometric measurements (bmi, r= 0,33; waist, r= 0.42). conclusions. us and ct measurements of intraabdominal fat emerge as promising techniques to identify obesity-associated metabolic risk in childhood
Mediciones de adiposidad intraabdominal por ultrasonido y factores asociados con riesgo cardiovascular en ni?os obesos
REYES,MARCELA; ESPINOZA,ANíBAL; REBOLLO,M. JESúS; MORAGA,FRANCISCO; MERICQ,VERóNICA; CASTILLO-DURáN,CARLOS;
Revista médica de Chile , 2010, DOI: 10.4067/S0034-98872010000200002
Abstract: background: cardiovascular risk factors are commonly present in obese children. aim: to evaluate the association among radiological measurements of intra-abdominal adipose tissue, and cardiovascular risk factors, in prepuberal obese children. patients and methods: we evaluated 30 obese (body mass index > p95) children aged 6 to 12 years (15 males). anthropometry and blood pressure were measured. subcutaneous and intra-abdominal fat thickness and fat area were measured by ultrasound (us) and computed tomography. serum insulin, glucose and lipid profile were measured in a fasting blood sample. homeostasis model assessment (homa) was calculated as an index of insulin resistance. results: there was a significant correlation between us intra-abdominal fat thickness and homa (r = 0.47, p < 0.01), serum triglycerides (r = 0.46, p < 0.05) and with positive criteria for metabolic syndrome (r = 0.66, p < 0.01). a receiver operating curve (roc) analysis showed that, above a cut-off of 45 mm for intra-abdominal fat thickness, us was able to identify insulin resistance with a sensibility and specificity of 79 and 69% respectively and metabolic syndrome with sensibility and specificity of 100 and 67% respectively. us and computed tomography measurements for intra-abdominal fat thickness were significantly correlated (r= 0.62, p < 0.01). conclusions: us measurements of intra-abdominal fat thickness identify obesity-associated damage in childhood. age-specific measurements of intra-abdominal adipose tissue may improve the detection power of this approach.
LOCALIZACIóN DE QTLS PARA CARACTERES RELACIONADOS CON LA DOMESTICACIóN DEL GIRASOL
Carlos J. Lozano Cavazos,M. Humberto Reyes-Valdu00E9s,Francisco Castillo Reyes,Jesu00FAs Rodru00EDguez de la Paz
Revista fitotecnia mexicana , 2010,
Abstract: El mejoramiento del girasol (Helianthus annuus L.) depende en gran medida de la introducción de diversidad genética proveniente de material silvestre. El objetivo de este trabajo fue construir un mapa de ligamiento basado en marcadores AFLP a partir de una población F2:3 derivada de un cruzamiento inter-subespecífico de girasol (H. annuus var. macrocarpus x H. annuus ssp. texanus Heiser), así como detectar posiciones de loci de caracteres cuantitativos (QTL) a través del enfoque analítico de mapeo por intervalos. Se evaluaron los siguientes caracteres contrastantes entre girasoles cultivados y silvestres, presumiblemente relacionados con la domesticación: altura de planta, número de capítulos (ramificación) y diámetro de capítulos por planta, número y peso de aquenios por capítulo, días a floración, días a madurez fisiológica y contenido de aceite de aquenios. La evaluación fenotípica se llevó a cabo en condiciones de campo, con un dise o de bloques incompletos con dos repeticiones. Se consideró un nivel de significancia estadística de amplitud genómica de 0.05 en la detección de los QTL. Para establecer los valores críticos de los estadísticos de prueba se hicieron pruebas de permutación sólo con los grupos de ligamiento con puntuaciones LOD (logaritmo de la razón de verosimilitudes) > 1.5. Además, para cada carácter se hizo un análisis de varianza por locus individual no ligado, con lo cual se identificaron cuatro loci no ligados que afectan el número de aquenios por capítulo y los días a madurez fisiológica, con P < 0.001. Se identificó un QTL significativo con amplitud genómica de 0.017 para peso de aquenios que podría representar una región del genoma relacionada con la domesticación, y cinco QTLs posibles en cinco caracteres. Los QTLs detectados, que incluyen los hipotéticos, explicaron de 7.1 a 11.9 % de la varianza fenotípica.
Presentación.
Pedro Reyes Castillo
Acta botánica mexicana , 1988,
Abstract:
IN MEMORIAM. VIOLETA MARCET OCA A [31 DE MARZO, 1934-19 DE ENERO, 2012]
Pedro Reyes-Castillo
Acta zoológica mexicana , 2012,
Abstract:
Invasive pneumococcal diseases among hospitalized children in Lima, Peru
Ochoa,Theresa J.; Egoavil,Martha; Castillo,María E.; Reyes,Isabel; Chaparro,Eduardo; Silva,Wilda; Campos,Francisco; Sáenz,Andrés;
Revista Panamericana de Salud Pública , 2010, DOI: 10.1590/S1020-49892010000800008
Abstract: objective: to determine the epidemiology of invasive pneumococcal disease (ipd) and the antibiotic susceptibility and serotype distribution of s. pneumoniae in pediatric patients in lima, peru. methods: a 2-year, multicenter, passive surveillance study conducted from may 2006- april 2008 in 11 public hospitals and five private laboratories in lima, peru, in patients less than 16 years of age with sterile site cultures yielding s. pneumoniae. antibiotic susceptibility was performed by etest? (ab biodisk, solna, switzerland). strains were serotyped by the quellung reaction. results: in all, 101 ipd episodes were studied, 68.3% of which were among children less than 24 months of age. diagnoses were: pneumonia (47.5%), meningitis (38.6%), and sepsis (7.9%). the overall case fatality rate was 22.0%; case fatality rate in meningitis was 32.4%. while 80.0% of fatal cases were in those less than 24 months of age, only 50.7% of non-fatal cases (p < 0.05) were in this age group. resistance rates were high for trimethoprim/ sulfamethoxazole (76.2%), erythromycin (24.8%), and penicillin (22.8%). the most common serotypes were 14, 6b, 19f, 23f, and 5, which accounted for 69.7% of all strains and 87.0% of penicillin non-susceptible strains. conclusions: ipd in hospitalized children in lima is associated with high antimicrobial resistance levels and elevated case fatality rate, especially in young children. this baseline data will be useful for evaluating the effects of vaccine introduction.
Localización de QTLs para caracteres relacionados con la domesticación del girasol
Lozano Cavazos, Carlos J.;Reyes-Valdés, M. Humberto;Castillo Reyes, Francisco;Rodríguez de la Paz, Jesús;Martínez de la Vega, Octavio;García Villanueva, Alma P.;
Revista fitotecnia mexicana , 2010,
Abstract: improvement of cultivated sunflower (helianthus annuus l.) depends largely on the introduction of genetic diversity from wild species. the purpose of the present study was to construct a linkage map based on aflp markers from an f2:3 population derived from a sunflower inter-subspecific cross (h. annuus var. macrocarpus × h. annuus ssp. texanus heiser), as well as to detect quantitative trait loci (qtl) positions by interval mapping. the following contrasting traits between cultivated and wild sunflowers, putatively related to domestication, were evaluated: plant height, head number (branching), and head diameter per plant, number and weight of achenes per head, days to flowering, days to physiological maturity, and seed oil content. the phenotypic evaluation was carried out in field conditions, by using an incomplete block design with two replications. a genome-wide statistical significance of 0.05 was used to detect qtls. to establish the empirical significance threshold values, permutation tests were performed only in linkage groups showing a lod (logarithm of odds) score >1.5. moreover, single marker-analyses using analysis of variance per unlinked individual locus for each trait were carried out, which identified four unlinked loci for number of achenes per head and days to physiological maturity with p < 0.001. we identified one qtl with genome-wide significance of 0.017 for achene weight, which could be representative of a genome region produced by domestication, plus five putative qtls in five characters. all the detected qtls, including putative ones at the chosen significance level, explained from 7.1 to 11.9 % of the phenotypic variance.
La malaria en México. Progresos y desafíos hacia su eliminación
Betanzos Reyes, ángel Francisco;
Boletín médico del Hospital Infantil de México , 2011,
Abstract: malaria continues to be a leading parasite disease in the tropics and subtropics including latin america. in this region, most cases of malaria are due to plasmodium vivax, however, cases of plasmodium falciparum continue to lead to cases of severe malaria in many countries in south america. control and elimination of malaria in latin america has been focused on the key steps of the parasite life cycle and transmission mechanism including vector control, decreasing the number of parasites during treatment and human reservoirs with intermittent preventive therapy with antimalarial drugs. in this effort, mexico has collaborated with many countries in central america towards the potential elimination of this parasitic infection. in this review, we discuss the achievements and remaining challenges in controlling and potentially eliminating malaria in mexico.
Page 1 /31995
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.