Raúl Cortina Torres - Academia.edu (original) (raw)
Papers by Raúl Cortina Torres
Revista Fitotecnia Mexicana
El maíz (Zea mays L.) criollo de la raza Jala es apreciado por su calidad para consumo en elote; ... more El maíz (Zea mays L.) criollo de la raza Jala es apreciado por su calidad para consumo en elote; sin embargo, posee características agronómicas indeseables como plantas altas, de hasta 5 m, muy tardío y escasa adaptabilidad. Para contribuir al aprovechamiento de las características eloteras del maíz Jala en el desarrollo de variedades mejoradas, en este estudio se evaluó su aptitud combinatoria para dichas características cuando Jala es cruzado con variedades comerciales. El trabajo se efectuo en Xalisco, Nayarit, México, con seis maíces reconocidos como eloteros: tres criollos (Mecatán, Morado y Jala) y tres híbridos comerciales (‘A7573’, ‘D880’ y ‘B810’). En el 2006 se aplicó un esquema de cruzamientos dialélico completo, de acuerdo con el modelo I de Griffing y la evaluación se realizó en dos fechas de siembra durante el 2007. El análisis de varianza detectó significancia (P ≤ 0.05) para rendimiento de elote (Rend), número total de granos (NG), número de hileras (NH) en el elote,...
2018 International Conference on High Performance Computing & Simulation (HPCS)
Syntax Trees (ASTs) are intermediate representations widely used by compiler frameworks. One of t... more Syntax Trees (ASTs) are intermediate representations widely used by compiler frameworks. One of their strengths is that they can be used to determine the similarity among a collection of programs. In this paper we propose a novel comparison method that converts ASTs into weighted strings in order to get similarity matrices and quantify the level of correlation among codes. To evaluate the approach, we leveraged the corresponding strings derived from the Clang ASTs of a set of 100 source code examples written in C. Our kernel and two other string kernels from the literature were used to obtain similarity matrices among those examples. Next, we used Hierarchical Clustering to visualize the results. Our solution was able to identify different clusters conformed by examples that shared similar semantics. We demonstrated that the proposed strategy can be promisingly applied to similarity problems involving trees or strings.
Revista Fitotecnia Mexicana
En México existen selecciones de aguacate tolerantes a sequía, salinidad o tristeza (Phytophthora... more En México existen selecciones de aguacate tolerantes a sequía, salinidad o tristeza (Phytophthora cinnamomi Rands) que pueden serusadas como portainjertos clonales; sin embargo, no existe información sobre su facilidad de enraizamiento. Esta investigación fue realizada para determinar el tiempo requerido y la capacidad de enraizamiento de 38 selecciones de aguacate (Persea americana Mill.) y dos de chinini (Persea schiedeana Nees) utilizando anillado de la corteza del tallo y acodo basal. La evaluación fue realizada en un vivero con 50 % de sombra en Xalisco, Nayarit. Las selecciones de aguacate fueron injertadas por enchapado lateral sobre portainjertos originados por semilla de siete meses de edad. Cuando los injertos tenían una longitud mínima de 15 a 20 cm fue hecho un anillado de corteza de 2 cm de ancho y se aplicó arriba del anillado una solución de ácido indol-3-butírico (2000 mg L-1) más ácido α-naftalenacético (1000 mg L-1 ). La capacidad de enraizamiento varió entre las s...
![Research paper thumbnail of FENOLOGÍA DE LA FLORACIÓN Y CICLOS REPRODUCTIVOS DEL NANCHE [Byrsonima crassifolia (L.) HBK] EN NAYARIT](https://attachments.academia-assets.com/110326777/thumbnails/1.jpg)
](Se determinaron los estados fenologicos de la inorescencia del nanche Amarillo Dulce, durante las... more Se determinaron los estados fenologicos de la inorescencia del nanche Amarillo Dulce, durante las fases de oracion y ciclos reproductivos en la seleccion Mejorado. El crecimiento de la inorescencia y el fruto de nanche se midieron en funcion de los grados dia de desarrollo (GDD). La inorescencia crecio 15 cm de longitud y necesito 413.6 GDD, que cubrio en 48 d. Las fases fenologicas fueron: 1) Yema hinchada, 2) Espiga, 3) Balon verde, 4) Balon amarillo, 5) Inicio de antesis, 6) Plena antesis, 7) Plena floracion y 8) Caida de petalo. El crecimiento del fruto describio una curva doble sigmoide a los 56 d y requirio de 517.5 GDD para alcanzar 18.3 mm de diametro ecuatorial. Se observaron tres flujos florales en un ano, denominados por su ocurrencia estacional como: a) Flujo de oracion de otono, b) Flujo de oracion de primavera y, c) Flujo de oracion de verano; que tuvieron una duracion de 65, 61 y 57 d, respectivamente. Tres ciclos productivos de fruto resultaron de los flujos florales...
Revista Fitotecnia Mexicana, 2010
El objetivo del estudio fue caracterizar la variabilidad morfológica en hojas de árboles de nanch... more El objetivo del estudio fue caracterizar la variabilidad morfológica en hojas de árboles de nanche (Byrsonima crassifolia (L.) H. B. K.) de la Sierra de Tabasco, México. En 39 accesiones se muestrearon hojas desarrolladas de la estación, y se seleccionaron 10 hojas representativas de cada una para ser evaluadas mediante análisis de imagen con 17 caracteres. Tres componentes principales explicaron 77.28 % de la variabilidad total. Con una distancia euclidiana de 0.07 en el dendrograma, se formaron cinco grupos con caracte-rísticas morfométricas similares. Los caracteres que mejor explican la variabilidad fueron: longitud del eje menor, índice de redondez, ángulo basal, ángulo de la quinta vena, relación longitud del eje mayor del limbo/longitud del eje menor, relación longitud del eje menor/longitud del pecíolo y relación ángulo basal/ángulo de la quinta vena.
Parallel I/O access patterns act as fingerprints of a parallel program. In order to extract meani... more Parallel I/O access patterns act as fingerprints of a parallel program. In order to extract meaningful information from these patterns, they have to be represented appropriately. Due to the fact that string objects can be easily compared using Kernel Methods, a conversion to a weighted string representation is proposed in this paper, together with a novel string kernel function called Kast Spectrum Kernel. The similarity matrices, obtained after applying the mentioned kernel over a set of examples from a real application, were analyzed using Kernel Principal Component Analysis (Kernel PCA) and Hierarchical Clustering. The evaluation showed that 2 out of 4 I/O access pattern groups were completely identified, while the other 2 conformed a single cluster due to the intrinsic similarity of their members. The proposed strategy can be promisingly applied to other similarity problems involving tree-like structured data.
Revista Mexicana de Ciencias Agrícolas, 2017
El nanche es un frutal de recolección cuyos frutos son apreciados por su sabor agridulce. El obj... more El nanche es un frutal de recolección cuyos frutos son apreciados por su sabor agridulce. El objetivo fue evaluar la calidad en frutos de 41 genotipos de nanche (Byrsonima crassifolia L. HBK) procedentes de la zona de clima cálido de Nayarit, México. Las variables de la calidad analizadas en los frutos: color, peso fresco (PFF), longitud (LF), diámetro (DF), sólidos solubles totales (°Brix), acidez titulable (porcentaje de ácido cítrico), pH de frutos. Además, se determinó el peso seco de la semilla (PSS). Se usó análisis estadístico multivariado de componentes principales para el procesamiento de datos. Tres componentes principales (CP’s) explicaron 80.61% de la varianza total (VT). El CP1 contribuyó con 38.58 de la VT en donde resultaron de importancia las variables morfológicas: peso, diámetro, longitud y tamaño de fruto mientras que el CP2 representó 24.78% de la VT, donde resultaron relevantes las características químicas: porcentaje de ácido cítrico de la ...
![Research paper thumbnail of Estudio de las principales plagas del nanche [Byrsonima crassifolia (L.) HBK] en Nayarit, México](https://attachments.academia-assets.com/110326771/thumbnails/1.jpg)
](Revista Mexicana de Ciencias Agrícolas, 2018
El nanche (Byrsonima crassifolia) es atacado en forma consistente por insectos que pueden conside... more El nanche (Byrsonima crassifolia) es atacado en forma consistente por insectos que pueden considerarse sus principales plagas. Las plagas del nanche que se encontraron son: gusano del fruto (Cryptophebia spp.; Lepidoptera: Tortricidae), gorgojo de las frutas secas (Carpophilus spp.; Coleoptera: Nitidulidae), salivazo del nanche (Clastoptera spp.; Hemiptera: Clastopteridae), periquito de los árboles (Membracis mexicana; Homoptera: Membracidae), escama verde (Coccus viridis; Hemiptera: Coccidae) y el piojo harinoso (Planoccus citri; Hemiptera: Pseudococcidae).
Revista Espacio I+D Innovación más Desarrollo, 2013
This paper presents results on the behavior and thermal comfort en rural sustainable housing comm... more This paper presents results on the behavior and thermal comfort en rural sustainable housing community of Nuevo Juan de Grijalva, located in Chiapas, Mexico during the month of January. In order to measure thermal behavior, Dry Bulb Temperature Variables and Superficial Interior Temperatures were measured; Thermal comfort was analyzed using the adaptive approach, using a questionnaire designed under regulation ISO 10551. This information allowed for the development of proposals to improve the housing design, principally for the use of passive means oriented towards thermal comfort in future developments.
Revista Mexicana de Ciencias Agrícolas, 2018
Para desarrollar programas de fertilización de sitio específico en el cultivo del mango, es nec... more Para desarrollar programas de fertilización de sitio específico en el cultivo del mango, es necesario disponer de información propia para cada región productora. El objetivo de este trabajo fue determinar la evolución de macro- y micronutrimentos a través de la vida de las hojas de los f lujos vegetativos de los cvs. Ataulfo, Kent y Tommy Atkins. Los huertos se localizaron en cuatro municipios del estado de Nayarit con clima cálido subhúmedo, en alturas de 11 a 601 m y temperatura media anual de 21.7 a 22.7 °C. En cada huerto se eligieron al azar 20 árboles y en cada uno de ellos fueron marcados 20 brotes recién emergidos de cada f lujo vegetativo. Se realizaron muestreos mensuales de hojas desde su nacimiento hasta la abscisión y se les determinaron en la materia seca las concentraciones de N, P, K, Ca, Mg, S, Fe, Cu, Mn, Zn y B. Para describir la evolución de cada nutrimento se predijeron sus concentraciones para cada día de vida de la hoja mediante el uso de funcione...
The Journal of Supercomputing, 2018
Understanding I/O for data-intense applications is the foundation for the optimization of these a... more Understanding I/O for data-intense applications is the foundation for the optimization of these applications. The classification of the applications according to the expressed I/O access pattern eases the analysis. An access pattern can be seen as fingerprint of an application. In this paper, we address the classification of traces. Firstly, we convert them first into a weighted string representation. Due to the fact that string objects can be easily compared using Kernel Methods, we explore their use for fingerprinting I/O patterns. To improve accuracy, we propose a novel string kernel function called Kast2 Spectrum Kernel. The similarity matrices, obtained after applying the mentioned kernel over a set of examples from a real application, were analyzed using Kernel Principal Component Analysis (Kernel PCA) and Hierarchical Clustering. The evaluation showed that two out of four I/O access pattern groups were completely identified, while the other two groups conformed a single cluster due to the intrinsic similarity of their members. The proposed strategy can be promisingly applied to other similarity problems involving tree-like structured data.
![Research paper thumbnail of Fruit Quality Indices in Eight Nance [Byrsonima crassifolia (L.) H.B.K.] Selections](https://attachments.academia-assets.com/110326767/thumbnails/1.jpg)
](HortScience, 2004
Nance [Byrsonima crassifolia (L.) HBK.] is a tropical fruit cultivated along the coastal areas of... more Nance [Byrsonima crassifolia (L.) HBK.] is a tropical fruit cultivated along the coastal areas of Mexico. Nance consumption has increased due to its versatility, as it can be used as fresh fruit, refreshments, and alcoholic beverages and also for preparing fruit rolls, bottled drinks, jellies, syrup, ice cream, and cakes. However, the broad variation in fruit quality parameters, like juice acidity, total soluble solids, skin color, and size, seems to limit its use. Since fruit quality can be influenced by the parameter used, multivariate canonical discriminant analysis (CDA) was used to discriminate among nance selections. The objective of this study was to find the best quality indices using physical and chemical fruit characteristics from eight nance selections cultivated in the state of Nayarit, Mexico. Six physical and five chemical variables of fruit quality were studied to determine the relative contribution of each variable to the discrimination between nance selections. Two ...
Journal of Civil Engineering and Architecture, 2014
The paper discusses the results of a field study carried out in four cities in Mexico: Hermosillo... more The paper discusses the results of a field study carried out in four cities in Mexico: Hermosillo, Mexicali, Merida and Colima, during the warmest seasons of 2006-2007. The survey is according to the adaptive approach of thermal comfort. The cities' climates are hot dry, hot sub-humid and hot humid. The respondents were inhabitants of low cost housings without air conditioning. The research was performed during warm seasons and according to ISO 10551. The measurements were processed by the common method of linear regression and also by alternative methods, useful for asymmetric climates. Individuals declared comfort at very high temperatures, either high or low humidity, therefore, the resulting neutral temperatures are higher than 30 C, except in Colima (28.8 C). The upper limits of comfort ranges achieved temperatures up to 35 C. The results suggest how great is the capacity of humans to adapt to conditions as extreme as those measured in the study.
Natural populations often grow, shrink, and migrate over time. Demographic processes such as thes... more Natural populations often grow, shrink, and migrate over time. Demographic processes such as these can impact genome-wide levels of genetic diversity. In addition, genetic variation in functional regions of the genome can be altered by natural selection, which drives adaptive mutations to higher frequencies or purges deleterious ones. Such selective processes impact not only the sites directly under selection but also nearby neutral variation through genetic linkage through processes referred to as genetic hitch-hiking in the context of positive selection and background selection (BGS) in the context of purifying selection. While there is extensive literature examining the impact of selection at linked sites at demographic equilibrium, less is known about how non-equilibrium demographic processes impact the effects of hitchhiking and BGS. Utilizing a global sample of human whole-genome sequences from the Thousand Genomes Project and extensive simulations, we investigate how non-equi...
Bioinformatics, 2016
Motivation: Variant calling from next-generation sequencing (NGS) data is susceptible to false po... more Motivation: Variant calling from next-generation sequencing (NGS) data is susceptible to false positive calls due to sequencing, mapping and other errors. To better distinguish true from false positive calls, we present a method that uses genotype array data from the sequenced samples, rather than public data such as HapMap or dbSNP, to train an accurate classifier using Random Forests. We demonstrate our method on a set of variant calls obtained from 642 African-ancestry genomes from the Consortium on Asthma among African-ancestry Populations in the Americas (CAAPA), sequenced to high depth (30X). Results: We have applied our classifier to compare call sets generated with different calling methods, including both single-sample and multi-sample callers. At a False Positive Rate of 5%, our method determines true positive rates of 97.5%, 95% and 99% on variant calls obtained using Illuminas singlesample caller CASAVA, Real Time Genomics multisample variant caller, and the GATK UnifiedGenotyper, respectively. Since NGS sequencing data may be accompanied by genotype data for the same samples, either collected concurrent to sequencing or from a previous study, our method can be trained on each dataset to provide a more accurate computational validation of site calls compared to generic methods. Moreover, our method allows for adjustment based on allele frequency (e.g. a different set of criteria to determine quality for rare versus common variants) and thereby provides insight into sequencing characteristics that indicate call quality for variants of different frequencies.
Nature communications, Oct 11, 2016
The African Diaspora in the Western Hemisphere represents one of the largest forced migrations in... more The African Diaspora in the Western Hemisphere represents one of the largest forced migrations in history and had a profound impact on genetic diversity in modern populations. To date, the fine-scale population structure of descendants of the African Diaspora remains largely uncharacterized. Here we present genetic variation from deeply sequenced genomes of 642 individuals from North and South American, Caribbean and West African populations, substantially increasing the lexicon of human genomic variation and suggesting much variation remains to be discovered in African-admixed populations in the Americas. We summarize genetic variation in these populations, quantifying the postcolonial sex-biased European gene flow across multiple regions. Moreover, we refine estimates on the burden of deleterious variants carried across populations and how this varies with African ancestry. Our data are an important resource for empowering disease mapping studies in African-admixed individuals and...
Molecular cell, Oct 6, 2016
Sister chromatid intertwines (SCIs), or catenanes, are topological links between replicated chrom... more Sister chromatid intertwines (SCIs), or catenanes, are topological links between replicated chromatids that interfere with chromosome segregation. The formation of SCIs is thought to be a consequence of fork swiveling during DNA replication, and their removal is thought to occur because of the intrinsic feature of type II topoisomerases (Top2) to simplify DNA topology. Here, we report that SCIs are also formed independently of DNA replication during G2/M by Top2-dependent concatenation of cohesed chromatids due to their physical proximity. We demonstrate that, in contrast to G2/M, Top2 removes SCIs from cohesed chromatids at the anaphase onset. Importantly, SCI removal in anaphase requires condensin and coincides with the hyperactivation of condensin DNA supercoiling activity. This is consistent with the longstanding proposal that condensin provides a bias in Top2 function toward decatenation. A comprehensive model for the formation and resolution of toxic SCI entanglements on eukar...
La trombosis de vena ovárica es una complicación infrecuente y grave del puerperio. Suele present... more La trombosis de vena ovárica es una complicación infrecuente y grave del puerperio. Suele presentarse como fiebre y dolor abdominal o pélvico en el puerperio, más frecuentemente en cesáreas. Existe un riesgo alto de tromboembolismo pulmonar y requiere un diagnóstico y tratamiento tempranos. Presentamos el caso de una paciente de 30 años, puérpera, con un cuadro de dolor pélvico y fiebre. Se realizó una tomografía computada y se detectó una trombosis de la vena ovárica derecha con extensión a la vena cava inferior. Se diagnosticó además endometritis, se trató con dalteparina y antibióticos. La trombosis de vena ovárica es un diagnóstico diferencial importante de fiebre en el puerperio.Ovarian vein thrombosis is a rare and severe puerperal complication that usually manifests as fever and abdominal pain in the puerperal period and is more frequent in women who have undergone cesarean section. There is an associated high risk of pulmonary embolism and thus early diagnosis and treatment are required. We report the case of a 30-year-old woman with pelvic pain and fever in the puerperal period. Computed tomography scan revealed ovarian vein thrombosis extending to the inferior vena cava. Endometritis was also diagnosed. The patient received dalteparin and antibiotics. Ovarian vein thrombosis should be included in the differential diagnosis of fever in the postpartum period.
Aquest projecte es basa en el disseny d’una cortina d’aigua programable per a fins publicitaris. ... more Aquest projecte es basa en el disseny d’una cortina d’aigua programable per a fins publicitaris. Aquesta cortina es capac de definir petites imatges, amb la caiguda de les gotes d’aigua. Per aixo s’ha dissenyat una aplicacio a l’ordinador, de tractament d’imatges, la qual comunica amb un microcontrolador que activa les electrovalvules corresponents. S’ha escollit tant el software com el hardware pensant en que la cortina fos operativa. Com a resultat d’aquest projecte, s’ha desenvolupat un prototip capac de reproduir imatges de 48 x 48 pixels.
Revista Fitotecnia Mexicana
El maíz (Zea mays L.) criollo de la raza Jala es apreciado por su calidad para consumo en elote; ... more El maíz (Zea mays L.) criollo de la raza Jala es apreciado por su calidad para consumo en elote; sin embargo, posee características agronómicas indeseables como plantas altas, de hasta 5 m, muy tardío y escasa adaptabilidad. Para contribuir al aprovechamiento de las características eloteras del maíz Jala en el desarrollo de variedades mejoradas, en este estudio se evaluó su aptitud combinatoria para dichas características cuando Jala es cruzado con variedades comerciales. El trabajo se efectuo en Xalisco, Nayarit, México, con seis maíces reconocidos como eloteros: tres criollos (Mecatán, Morado y Jala) y tres híbridos comerciales (‘A7573’, ‘D880’ y ‘B810’). En el 2006 se aplicó un esquema de cruzamientos dialélico completo, de acuerdo con el modelo I de Griffing y la evaluación se realizó en dos fechas de siembra durante el 2007. El análisis de varianza detectó significancia (P ≤ 0.05) para rendimiento de elote (Rend), número total de granos (NG), número de hileras (NH) en el elote,...
2018 International Conference on High Performance Computing & Simulation (HPCS)
Syntax Trees (ASTs) are intermediate representations widely used by compiler frameworks. One of t... more Syntax Trees (ASTs) are intermediate representations widely used by compiler frameworks. One of their strengths is that they can be used to determine the similarity among a collection of programs. In this paper we propose a novel comparison method that converts ASTs into weighted strings in order to get similarity matrices and quantify the level of correlation among codes. To evaluate the approach, we leveraged the corresponding strings derived from the Clang ASTs of a set of 100 source code examples written in C. Our kernel and two other string kernels from the literature were used to obtain similarity matrices among those examples. Next, we used Hierarchical Clustering to visualize the results. Our solution was able to identify different clusters conformed by examples that shared similar semantics. We demonstrated that the proposed strategy can be promisingly applied to similarity problems involving trees or strings.
Revista Fitotecnia Mexicana
En México existen selecciones de aguacate tolerantes a sequía, salinidad o tristeza (Phytophthora... more En México existen selecciones de aguacate tolerantes a sequía, salinidad o tristeza (Phytophthora cinnamomi Rands) que pueden serusadas como portainjertos clonales; sin embargo, no existe información sobre su facilidad de enraizamiento. Esta investigación fue realizada para determinar el tiempo requerido y la capacidad de enraizamiento de 38 selecciones de aguacate (Persea americana Mill.) y dos de chinini (Persea schiedeana Nees) utilizando anillado de la corteza del tallo y acodo basal. La evaluación fue realizada en un vivero con 50 % de sombra en Xalisco, Nayarit. Las selecciones de aguacate fueron injertadas por enchapado lateral sobre portainjertos originados por semilla de siete meses de edad. Cuando los injertos tenían una longitud mínima de 15 a 20 cm fue hecho un anillado de corteza de 2 cm de ancho y se aplicó arriba del anillado una solución de ácido indol-3-butírico (2000 mg L-1) más ácido α-naftalenacético (1000 mg L-1 ). La capacidad de enraizamiento varió entre las s...
Se determinaron los estados fenologicos de la inorescencia del nanche Amarillo Dulce, durante las... more Se determinaron los estados fenologicos de la inorescencia del nanche Amarillo Dulce, durante las fases de oracion y ciclos reproductivos en la seleccion Mejorado. El crecimiento de la inorescencia y el fruto de nanche se midieron en funcion de los grados dia de desarrollo (GDD). La inorescencia crecio 15 cm de longitud y necesito 413.6 GDD, que cubrio en 48 d. Las fases fenologicas fueron: 1) Yema hinchada, 2) Espiga, 3) Balon verde, 4) Balon amarillo, 5) Inicio de antesis, 6) Plena antesis, 7) Plena floracion y 8) Caida de petalo. El crecimiento del fruto describio una curva doble sigmoide a los 56 d y requirio de 517.5 GDD para alcanzar 18.3 mm de diametro ecuatorial. Se observaron tres flujos florales en un ano, denominados por su ocurrencia estacional como: a) Flujo de oracion de otono, b) Flujo de oracion de primavera y, c) Flujo de oracion de verano; que tuvieron una duracion de 65, 61 y 57 d, respectivamente. Tres ciclos productivos de fruto resultaron de los flujos florales...
Revista Fitotecnia Mexicana, 2010
El objetivo del estudio fue caracterizar la variabilidad morfológica en hojas de árboles de nanch... more El objetivo del estudio fue caracterizar la variabilidad morfológica en hojas de árboles de nanche (Byrsonima crassifolia (L.) H. B. K.) de la Sierra de Tabasco, México. En 39 accesiones se muestrearon hojas desarrolladas de la estación, y se seleccionaron 10 hojas representativas de cada una para ser evaluadas mediante análisis de imagen con 17 caracteres. Tres componentes principales explicaron 77.28 % de la variabilidad total. Con una distancia euclidiana de 0.07 en el dendrograma, se formaron cinco grupos con caracte-rísticas morfométricas similares. Los caracteres que mejor explican la variabilidad fueron: longitud del eje menor, índice de redondez, ángulo basal, ángulo de la quinta vena, relación longitud del eje mayor del limbo/longitud del eje menor, relación longitud del eje menor/longitud del pecíolo y relación ángulo basal/ángulo de la quinta vena.
Parallel I/O access patterns act as fingerprints of a parallel program. In order to extract meani... more Parallel I/O access patterns act as fingerprints of a parallel program. In order to extract meaningful information from these patterns, they have to be represented appropriately. Due to the fact that string objects can be easily compared using Kernel Methods, a conversion to a weighted string representation is proposed in this paper, together with a novel string kernel function called Kast Spectrum Kernel. The similarity matrices, obtained after applying the mentioned kernel over a set of examples from a real application, were analyzed using Kernel Principal Component Analysis (Kernel PCA) and Hierarchical Clustering. The evaluation showed that 2 out of 4 I/O access pattern groups were completely identified, while the other 2 conformed a single cluster due to the intrinsic similarity of their members. The proposed strategy can be promisingly applied to other similarity problems involving tree-like structured data.
Revista Mexicana de Ciencias Agrícolas, 2017
El nanche es un frutal de recolección cuyos frutos son apreciados por su sabor agridulce. El obj... more El nanche es un frutal de recolección cuyos frutos son apreciados por su sabor agridulce. El objetivo fue evaluar la calidad en frutos de 41 genotipos de nanche (Byrsonima crassifolia L. HBK) procedentes de la zona de clima cálido de Nayarit, México. Las variables de la calidad analizadas en los frutos: color, peso fresco (PFF), longitud (LF), diámetro (DF), sólidos solubles totales (°Brix), acidez titulable (porcentaje de ácido cítrico), pH de frutos. Además, se determinó el peso seco de la semilla (PSS). Se usó análisis estadístico multivariado de componentes principales para el procesamiento de datos. Tres componentes principales (CP’s) explicaron 80.61% de la varianza total (VT). El CP1 contribuyó con 38.58 de la VT en donde resultaron de importancia las variables morfológicas: peso, diámetro, longitud y tamaño de fruto mientras que el CP2 representó 24.78% de la VT, donde resultaron relevantes las características químicas: porcentaje de ácido cítrico de la ...
Revista Mexicana de Ciencias Agrícolas, 2018
El nanche (Byrsonima crassifolia) es atacado en forma consistente por insectos que pueden conside... more El nanche (Byrsonima crassifolia) es atacado en forma consistente por insectos que pueden considerarse sus principales plagas. Las plagas del nanche que se encontraron son: gusano del fruto (Cryptophebia spp.; Lepidoptera: Tortricidae), gorgojo de las frutas secas (Carpophilus spp.; Coleoptera: Nitidulidae), salivazo del nanche (Clastoptera spp.; Hemiptera: Clastopteridae), periquito de los árboles (Membracis mexicana; Homoptera: Membracidae), escama verde (Coccus viridis; Hemiptera: Coccidae) y el piojo harinoso (Planoccus citri; Hemiptera: Pseudococcidae).
Revista Espacio I+D Innovación más Desarrollo, 2013
This paper presents results on the behavior and thermal comfort en rural sustainable housing comm... more This paper presents results on the behavior and thermal comfort en rural sustainable housing community of Nuevo Juan de Grijalva, located in Chiapas, Mexico during the month of January. In order to measure thermal behavior, Dry Bulb Temperature Variables and Superficial Interior Temperatures were measured; Thermal comfort was analyzed using the adaptive approach, using a questionnaire designed under regulation ISO 10551. This information allowed for the development of proposals to improve the housing design, principally for the use of passive means oriented towards thermal comfort in future developments.
Revista Mexicana de Ciencias Agrícolas, 2018
Para desarrollar programas de fertilización de sitio específico en el cultivo del mango, es nec... more Para desarrollar programas de fertilización de sitio específico en el cultivo del mango, es necesario disponer de información propia para cada región productora. El objetivo de este trabajo fue determinar la evolución de macro- y micronutrimentos a través de la vida de las hojas de los f lujos vegetativos de los cvs. Ataulfo, Kent y Tommy Atkins. Los huertos se localizaron en cuatro municipios del estado de Nayarit con clima cálido subhúmedo, en alturas de 11 a 601 m y temperatura media anual de 21.7 a 22.7 °C. En cada huerto se eligieron al azar 20 árboles y en cada uno de ellos fueron marcados 20 brotes recién emergidos de cada f lujo vegetativo. Se realizaron muestreos mensuales de hojas desde su nacimiento hasta la abscisión y se les determinaron en la materia seca las concentraciones de N, P, K, Ca, Mg, S, Fe, Cu, Mn, Zn y B. Para describir la evolución de cada nutrimento se predijeron sus concentraciones para cada día de vida de la hoja mediante el uso de funcione...
The Journal of Supercomputing, 2018
Understanding I/O for data-intense applications is the foundation for the optimization of these a... more Understanding I/O for data-intense applications is the foundation for the optimization of these applications. The classification of the applications according to the expressed I/O access pattern eases the analysis. An access pattern can be seen as fingerprint of an application. In this paper, we address the classification of traces. Firstly, we convert them first into a weighted string representation. Due to the fact that string objects can be easily compared using Kernel Methods, we explore their use for fingerprinting I/O patterns. To improve accuracy, we propose a novel string kernel function called Kast2 Spectrum Kernel. The similarity matrices, obtained after applying the mentioned kernel over a set of examples from a real application, were analyzed using Kernel Principal Component Analysis (Kernel PCA) and Hierarchical Clustering. The evaluation showed that two out of four I/O access pattern groups were completely identified, while the other two groups conformed a single cluster due to the intrinsic similarity of their members. The proposed strategy can be promisingly applied to other similarity problems involving tree-like structured data.
HortScience, 2004
Nance [Byrsonima crassifolia (L.) HBK.] is a tropical fruit cultivated along the coastal areas of... more Nance [Byrsonima crassifolia (L.) HBK.] is a tropical fruit cultivated along the coastal areas of Mexico. Nance consumption has increased due to its versatility, as it can be used as fresh fruit, refreshments, and alcoholic beverages and also for preparing fruit rolls, bottled drinks, jellies, syrup, ice cream, and cakes. However, the broad variation in fruit quality parameters, like juice acidity, total soluble solids, skin color, and size, seems to limit its use. Since fruit quality can be influenced by the parameter used, multivariate canonical discriminant analysis (CDA) was used to discriminate among nance selections. The objective of this study was to find the best quality indices using physical and chemical fruit characteristics from eight nance selections cultivated in the state of Nayarit, Mexico. Six physical and five chemical variables of fruit quality were studied to determine the relative contribution of each variable to the discrimination between nance selections. Two ...
Journal of Civil Engineering and Architecture, 2014
The paper discusses the results of a field study carried out in four cities in Mexico: Hermosillo... more The paper discusses the results of a field study carried out in four cities in Mexico: Hermosillo, Mexicali, Merida and Colima, during the warmest seasons of 2006-2007. The survey is according to the adaptive approach of thermal comfort. The cities' climates are hot dry, hot sub-humid and hot humid. The respondents were inhabitants of low cost housings without air conditioning. The research was performed during warm seasons and according to ISO 10551. The measurements were processed by the common method of linear regression and also by alternative methods, useful for asymmetric climates. Individuals declared comfort at very high temperatures, either high or low humidity, therefore, the resulting neutral temperatures are higher than 30 C, except in Colima (28.8 C). The upper limits of comfort ranges achieved temperatures up to 35 C. The results suggest how great is the capacity of humans to adapt to conditions as extreme as those measured in the study.
Natural populations often grow, shrink, and migrate over time. Demographic processes such as thes... more Natural populations often grow, shrink, and migrate over time. Demographic processes such as these can impact genome-wide levels of genetic diversity. In addition, genetic variation in functional regions of the genome can be altered by natural selection, which drives adaptive mutations to higher frequencies or purges deleterious ones. Such selective processes impact not only the sites directly under selection but also nearby neutral variation through genetic linkage through processes referred to as genetic hitch-hiking in the context of positive selection and background selection (BGS) in the context of purifying selection. While there is extensive literature examining the impact of selection at linked sites at demographic equilibrium, less is known about how non-equilibrium demographic processes impact the effects of hitchhiking and BGS. Utilizing a global sample of human whole-genome sequences from the Thousand Genomes Project and extensive simulations, we investigate how non-equi...
Bioinformatics, 2016
Motivation: Variant calling from next-generation sequencing (NGS) data is susceptible to false po... more Motivation: Variant calling from next-generation sequencing (NGS) data is susceptible to false positive calls due to sequencing, mapping and other errors. To better distinguish true from false positive calls, we present a method that uses genotype array data from the sequenced samples, rather than public data such as HapMap or dbSNP, to train an accurate classifier using Random Forests. We demonstrate our method on a set of variant calls obtained from 642 African-ancestry genomes from the Consortium on Asthma among African-ancestry Populations in the Americas (CAAPA), sequenced to high depth (30X). Results: We have applied our classifier to compare call sets generated with different calling methods, including both single-sample and multi-sample callers. At a False Positive Rate of 5%, our method determines true positive rates of 97.5%, 95% and 99% on variant calls obtained using Illuminas singlesample caller CASAVA, Real Time Genomics multisample variant caller, and the GATK UnifiedGenotyper, respectively. Since NGS sequencing data may be accompanied by genotype data for the same samples, either collected concurrent to sequencing or from a previous study, our method can be trained on each dataset to provide a more accurate computational validation of site calls compared to generic methods. Moreover, our method allows for adjustment based on allele frequency (e.g. a different set of criteria to determine quality for rare versus common variants) and thereby provides insight into sequencing characteristics that indicate call quality for variants of different frequencies.
Nature communications, Oct 11, 2016
The African Diaspora in the Western Hemisphere represents one of the largest forced migrations in... more The African Diaspora in the Western Hemisphere represents one of the largest forced migrations in history and had a profound impact on genetic diversity in modern populations. To date, the fine-scale population structure of descendants of the African Diaspora remains largely uncharacterized. Here we present genetic variation from deeply sequenced genomes of 642 individuals from North and South American, Caribbean and West African populations, substantially increasing the lexicon of human genomic variation and suggesting much variation remains to be discovered in African-admixed populations in the Americas. We summarize genetic variation in these populations, quantifying the postcolonial sex-biased European gene flow across multiple regions. Moreover, we refine estimates on the burden of deleterious variants carried across populations and how this varies with African ancestry. Our data are an important resource for empowering disease mapping studies in African-admixed individuals and...
Molecular cell, Oct 6, 2016
Sister chromatid intertwines (SCIs), or catenanes, are topological links between replicated chrom... more Sister chromatid intertwines (SCIs), or catenanes, are topological links between replicated chromatids that interfere with chromosome segregation. The formation of SCIs is thought to be a consequence of fork swiveling during DNA replication, and their removal is thought to occur because of the intrinsic feature of type II topoisomerases (Top2) to simplify DNA topology. Here, we report that SCIs are also formed independently of DNA replication during G2/M by Top2-dependent concatenation of cohesed chromatids due to their physical proximity. We demonstrate that, in contrast to G2/M, Top2 removes SCIs from cohesed chromatids at the anaphase onset. Importantly, SCI removal in anaphase requires condensin and coincides with the hyperactivation of condensin DNA supercoiling activity. This is consistent with the longstanding proposal that condensin provides a bias in Top2 function toward decatenation. A comprehensive model for the formation and resolution of toxic SCI entanglements on eukar...
La trombosis de vena ovárica es una complicación infrecuente y grave del puerperio. Suele present... more La trombosis de vena ovárica es una complicación infrecuente y grave del puerperio. Suele presentarse como fiebre y dolor abdominal o pélvico en el puerperio, más frecuentemente en cesáreas. Existe un riesgo alto de tromboembolismo pulmonar y requiere un diagnóstico y tratamiento tempranos. Presentamos el caso de una paciente de 30 años, puérpera, con un cuadro de dolor pélvico y fiebre. Se realizó una tomografía computada y se detectó una trombosis de la vena ovárica derecha con extensión a la vena cava inferior. Se diagnosticó además endometritis, se trató con dalteparina y antibióticos. La trombosis de vena ovárica es un diagnóstico diferencial importante de fiebre en el puerperio.Ovarian vein thrombosis is a rare and severe puerperal complication that usually manifests as fever and abdominal pain in the puerperal period and is more frequent in women who have undergone cesarean section. There is an associated high risk of pulmonary embolism and thus early diagnosis and treatment are required. We report the case of a 30-year-old woman with pelvic pain and fever in the puerperal period. Computed tomography scan revealed ovarian vein thrombosis extending to the inferior vena cava. Endometritis was also diagnosed. The patient received dalteparin and antibiotics. Ovarian vein thrombosis should be included in the differential diagnosis of fever in the postpartum period.
Aquest projecte es basa en el disseny d’una cortina d’aigua programable per a fins publicitaris. ... more Aquest projecte es basa en el disseny d’una cortina d’aigua programable per a fins publicitaris. Aquesta cortina es capac de definir petites imatges, amb la caiguda de les gotes d’aigua. Per aixo s’ha dissenyat una aplicacio a l’ordinador, de tractament d’imatges, la qual comunica amb un microcontrolador que activa les electrovalvules corresponents. S’ha escollit tant el software com el hardware pensant en que la cortina fos operativa. Com a resultat d’aquest projecte, s’ha desenvolupat un prototip capac de reproduir imatges de 48 x 48 pixels.