Daniel Valerio - Academia.edu (original) (raw)
Papers by Daniel Valerio
January 2020, 2020
The nematode Meloidogyne exigua causes moderate losses in almost all coffee plantations in Costa ... more The nematode Meloidogyne exigua causes moderate losses in almost all coffee plantations in Costa Rica. The objective of this research was to evaluate the resistance of Coffea arabica cultivars developed in Brazil to M. exigua native from Costa Rica. The trial was carried out in Heredia, Costa Rica. A randomized complete block design with five replications was used to evaluate the cultivars Caturra, Catuaí Vermelho IAC 99, IAPAR 59, IPR 98, IPR 99, IPR 100, IPR 102, IPR 103, IPR 106 and IPR 107. The plants were grown in pots and inoculated with 2500 eggs + J2 117 d after the transplant. The evaluation was performed 209 d after the inoculation considering the number of eggs + J2 in 100 g of roots and the estimation of gall index (GI) of each plant. The reduction in the reproduction factor showed resistance for the cultivars IPR 99, IPR 100, IPR 102, IPR 103 and IPR 107. This represents a great possibility to face M. exigua of Costa Rica in a sustainable way with varieties developed in...
CNS Spectrums, 2021
BackgroundThe aim of this study is to identify differentially methylated regions (DMRs) in the ge... more BackgroundThe aim of this study is to identify differentially methylated regions (DMRs) in the genomes of a sample of cognitively healthy individuals and a sample of individuals with LOAD, all of them nonagenarians from Costa Rica.MethodsIn this study, we compared whole blood DNA methylation profiles of 32 individuals: 21 cognitively healthy and 11 with LOAD, using the Infinium MethylationEPIC BeadChip. First, we calculated the epigenetic age of the participants based on Horvath’s epigenetic clock. DMRcate and Bumphunter were used to identify DMRs. After in silico and knowledge-based filtering of the DMRs, we performed a methylation quantitative loci (mQTL) analysis (rs708727 and rs960603).ResultsOn average, the epigenetic age was 73 years in both groups, which represents a difference of over 20 years between epigenetic and chronological age in both affected and unaffected individuals. Methylation analysis revealed 11 DMRs between groups, which contain six genes and two pseudogenes....
Agronomía Costarricense, 2019
La arañita roja (Oligonychus yothersi) ha sido catalogada como una plaga de poca importancia en l... more La arañita roja (Oligonychus yothersi) ha sido catalogada como una plaga de poca importancia en los cafetales de Costa Rica, lo cual afecta levemente solo en la época seca en los bordes del cultivo. El único ataque fuerte de O. yothersi se reportó entre 1963 y 1965 en el Valle Central, relacionado con la caída de ceniza del volcán Irazú. Durante el año 2017 el volcán Poás lanzó cantidades importantes de ceniza que fueron llevadas por el viento en dirección suroeste y se relacionó con un fuerte ataque de arañita roja entre noviembre de 2017 y marzo de 2018, en un área de 4155 ha ubicadas sobre 1200 m de altura entre los cantones de Poás y Naranjo de Alajuela. La población decreció por efectos del combate biológico natural lo cual se relaciona con una población abundante de 5 especies de depredadores. Se evaluó el control con acaricidas químicos con buenos resultados al aplicar productos a base de propargite y azufre.
Interciencia, Sep 1, 2009
Interciencia, Sep 1, 2009
Sistemas de pastoreo. Vacuno de carne. Investigación en sistemas ganaderos.
El objetivo de este trabajo fue identificar y caracterizar las tipologías de los sistemas caprino... more El objetivo de este trabajo fue identificar y caracterizar las tipologías de los sistemas caprinos en la República Dominicana, que determinen el rendimiento técnico y económico. Los datos de 33 unidades de producción caprinas (UP) fueron recogidos mediante un muestreo aleatorio, 51 variables técnicas y socio- económicas fueron analizadas mediante un análisis multivariante. Este análisis permitió la selección de cuatro componentes principales relacionados con la intensificación, la productividad, la diversificación, el nivel tecnológico y el tamaño de la finca. Un análisis de cluster posterior clasificó las UP en tres grupos. Grupo 1, llamado Tradicional de subsistencia, incluye UP de tamaño medio, con un manejo tradicional con bajos niveles de productividad, tecnología y carga animal. El grupo 2, desarrolla un sistema semi-extensivo con mejores niveles tecnológicos y uso de alimentación externa, alta producción ovina y una mayor proporción de terrenos en propiedad a pesar de que log...
NEW SOLUTIONS: A Journal of Environmental and Occupational Health Policy, 2014
Harriet Hardy, protégé of Alice Hamilton, spent 1948 in the Health Division of Los Alamos Scienti... more Harriet Hardy, protégé of Alice Hamilton, spent 1948 in the Health Division of Los Alamos Scientific Laboratory. The contemporary campaign for federal legislation to compensate nuclear workers brought to the fore living retirees in whose cases of occupational illness Hardy had a role in diagnosis or case management. A third case is documented in archival records. Methods of participatory action research were used to better document the cases and strategize in light of the evidence, thereby assisting the workers with compensation claims. Medical and neuropsychological exams of the mercury case were conducted. Hardy's diary entries and memoirs were interpreted in light of medicolegal documentation and workers' recollections. Through these participatory research activities, Harriet Hardy's role and influence both inside and outside the atomic weapons complex have been elucidated. An important lesson learned is the ongoing need for a system of protective medical evaluations ...
Journal of Molluscan Studies, 2008
A photogrammetric methodology is proposed to measure the diameter of snail shells on digital pict... more A photogrammetric methodology is proposed to measure the diameter of snail shells on digital pictures. Digital photographs were taken of juvenile Cantereus aspersus snails. AutoCAD image analysis software was used for the measurements and the results were contrasted with data obtained using a digital caliper in the same snails to compare the accuracy of both methods. The snails were individually weighed and the shell diameter was measured once a week, for a total of 7 weeks. After the third week, there were no significant differences between both methods, whereas in the first 2 weeks the measurements obtained with a digital caliper scored larger diameters than the photogrammetric measurements. This is probably due to the difficulty to define the end of the shell with the caliper, whereas the photogrammetric analysis does not involve any risk for the snail. To test the reproducibility and repeatability of both methodologies seven snails were measured five times by three different examiners. Using the variance components analysis, the repeatability was 4.8% of the total variation for the photogrammetric methodology and 6.9% for the conventional methodology, while the reproducibility was 0.0% and 2.7% for the photogrammetric and conventional methodology, respectively. These findings indicate that the photogrammetric methodology can be used with confidence to measure the diameter of snail shells. The great advantage of this method is the ability to magnify the images to make more precise measurements from snails of any size, which is especially useful in the early stages of development. The growth data were used to construct a model for live weight (LW) estimation based on shell diameter. The snails showed high growth rates both in terms of shell diameter and LW. The shell diameters showed a low individual variation (16.2% CV) and were normally distributed, whereas the LWs showed greater variability (36.8% CV) and were not normally distributed. The best model for estimating LW from shell diameter in juvenile snails is the multiplicative model, with a high determination coefficient (96%).
Archivos de …
... Universidad de Córdoba (UCO). Campus de Rabanales. 14071 Córdoba. España. E-mail: pa1gamaa@uc... more ... Universidad de Córdoba (UCO). Campus de Rabanales. 14071 Córdoba. España. E-mail: pa1gamaa@uco.es 2Instituto Andaluz de Investigación y Formación Agraria, Pesquera, Alimentaria y de la Producción Ecológica. CIFA de Hinojosa del Duque. Córdoba. España. ...
Archivos de Zootecnia, 2010
The American Journal of Geriatric Psychiatry, 2014
Objective-To study the association of dementia with APOE-e4 and its interaction with age in a non... more Objective-To study the association of dementia with APOE-e4 and its interaction with age in a nonagenarian Costa Ricans (N-sample) and a general elderly contrast group (GE-sample). Methods-In both case-control studies, participants were cognitively intact or demented. The Nsample (N=112) was at least age 90; the GE-sample (N=98) was at least age 65. Results-Dementia and APOE-e4 were not significantly associated in the N-sample, but were in the GE-sample. There was a significant interaction of age with APOE-e4 in the N-sample, but not in the GE-sample. Descriptively dividing the N-sample at the median (age 93) showed a group
January 2020, 2020
The nematode Meloidogyne exigua causes moderate losses in almost all coffee plantations in Costa ... more The nematode Meloidogyne exigua causes moderate losses in almost all coffee plantations in Costa Rica. The objective of this research was to evaluate the resistance of Coffea arabica cultivars developed in Brazil to M. exigua native from Costa Rica. The trial was carried out in Heredia, Costa Rica. A randomized complete block design with five replications was used to evaluate the cultivars Caturra, Catuaí Vermelho IAC 99, IAPAR 59, IPR 98, IPR 99, IPR 100, IPR 102, IPR 103, IPR 106 and IPR 107. The plants were grown in pots and inoculated with 2500 eggs + J2 117 d after the transplant. The evaluation was performed 209 d after the inoculation considering the number of eggs + J2 in 100 g of roots and the estimation of gall index (GI) of each plant. The reduction in the reproduction factor showed resistance for the cultivars IPR 99, IPR 100, IPR 102, IPR 103 and IPR 107. This represents a great possibility to face M. exigua of Costa Rica in a sustainable way with varieties developed in...
CNS Spectrums, 2021
BackgroundThe aim of this study is to identify differentially methylated regions (DMRs) in the ge... more BackgroundThe aim of this study is to identify differentially methylated regions (DMRs) in the genomes of a sample of cognitively healthy individuals and a sample of individuals with LOAD, all of them nonagenarians from Costa Rica.MethodsIn this study, we compared whole blood DNA methylation profiles of 32 individuals: 21 cognitively healthy and 11 with LOAD, using the Infinium MethylationEPIC BeadChip. First, we calculated the epigenetic age of the participants based on Horvath’s epigenetic clock. DMRcate and Bumphunter were used to identify DMRs. After in silico and knowledge-based filtering of the DMRs, we performed a methylation quantitative loci (mQTL) analysis (rs708727 and rs960603).ResultsOn average, the epigenetic age was 73 years in both groups, which represents a difference of over 20 years between epigenetic and chronological age in both affected and unaffected individuals. Methylation analysis revealed 11 DMRs between groups, which contain six genes and two pseudogenes....
Agronomía Costarricense, 2019
La arañita roja (Oligonychus yothersi) ha sido catalogada como una plaga de poca importancia en l... more La arañita roja (Oligonychus yothersi) ha sido catalogada como una plaga de poca importancia en los cafetales de Costa Rica, lo cual afecta levemente solo en la época seca en los bordes del cultivo. El único ataque fuerte de O. yothersi se reportó entre 1963 y 1965 en el Valle Central, relacionado con la caída de ceniza del volcán Irazú. Durante el año 2017 el volcán Poás lanzó cantidades importantes de ceniza que fueron llevadas por el viento en dirección suroeste y se relacionó con un fuerte ataque de arañita roja entre noviembre de 2017 y marzo de 2018, en un área de 4155 ha ubicadas sobre 1200 m de altura entre los cantones de Poás y Naranjo de Alajuela. La población decreció por efectos del combate biológico natural lo cual se relaciona con una población abundante de 5 especies de depredadores. Se evaluó el control con acaricidas químicos con buenos resultados al aplicar productos a base de propargite y azufre.
Interciencia, Sep 1, 2009
Interciencia, Sep 1, 2009
Sistemas de pastoreo. Vacuno de carne. Investigación en sistemas ganaderos.
El objetivo de este trabajo fue identificar y caracterizar las tipologías de los sistemas caprino... more El objetivo de este trabajo fue identificar y caracterizar las tipologías de los sistemas caprinos en la República Dominicana, que determinen el rendimiento técnico y económico. Los datos de 33 unidades de producción caprinas (UP) fueron recogidos mediante un muestreo aleatorio, 51 variables técnicas y socio- económicas fueron analizadas mediante un análisis multivariante. Este análisis permitió la selección de cuatro componentes principales relacionados con la intensificación, la productividad, la diversificación, el nivel tecnológico y el tamaño de la finca. Un análisis de cluster posterior clasificó las UP en tres grupos. Grupo 1, llamado Tradicional de subsistencia, incluye UP de tamaño medio, con un manejo tradicional con bajos niveles de productividad, tecnología y carga animal. El grupo 2, desarrolla un sistema semi-extensivo con mejores niveles tecnológicos y uso de alimentación externa, alta producción ovina y una mayor proporción de terrenos en propiedad a pesar de que log...
NEW SOLUTIONS: A Journal of Environmental and Occupational Health Policy, 2014
Harriet Hardy, protégé of Alice Hamilton, spent 1948 in the Health Division of Los Alamos Scienti... more Harriet Hardy, protégé of Alice Hamilton, spent 1948 in the Health Division of Los Alamos Scientific Laboratory. The contemporary campaign for federal legislation to compensate nuclear workers brought to the fore living retirees in whose cases of occupational illness Hardy had a role in diagnosis or case management. A third case is documented in archival records. Methods of participatory action research were used to better document the cases and strategize in light of the evidence, thereby assisting the workers with compensation claims. Medical and neuropsychological exams of the mercury case were conducted. Hardy's diary entries and memoirs were interpreted in light of medicolegal documentation and workers' recollections. Through these participatory research activities, Harriet Hardy's role and influence both inside and outside the atomic weapons complex have been elucidated. An important lesson learned is the ongoing need for a system of protective medical evaluations ...
Journal of Molluscan Studies, 2008
A photogrammetric methodology is proposed to measure the diameter of snail shells on digital pict... more A photogrammetric methodology is proposed to measure the diameter of snail shells on digital pictures. Digital photographs were taken of juvenile Cantereus aspersus snails. AutoCAD image analysis software was used for the measurements and the results were contrasted with data obtained using a digital caliper in the same snails to compare the accuracy of both methods. The snails were individually weighed and the shell diameter was measured once a week, for a total of 7 weeks. After the third week, there were no significant differences between both methods, whereas in the first 2 weeks the measurements obtained with a digital caliper scored larger diameters than the photogrammetric measurements. This is probably due to the difficulty to define the end of the shell with the caliper, whereas the photogrammetric analysis does not involve any risk for the snail. To test the reproducibility and repeatability of both methodologies seven snails were measured five times by three different examiners. Using the variance components analysis, the repeatability was 4.8% of the total variation for the photogrammetric methodology and 6.9% for the conventional methodology, while the reproducibility was 0.0% and 2.7% for the photogrammetric and conventional methodology, respectively. These findings indicate that the photogrammetric methodology can be used with confidence to measure the diameter of snail shells. The great advantage of this method is the ability to magnify the images to make more precise measurements from snails of any size, which is especially useful in the early stages of development. The growth data were used to construct a model for live weight (LW) estimation based on shell diameter. The snails showed high growth rates both in terms of shell diameter and LW. The shell diameters showed a low individual variation (16.2% CV) and were normally distributed, whereas the LWs showed greater variability (36.8% CV) and were not normally distributed. The best model for estimating LW from shell diameter in juvenile snails is the multiplicative model, with a high determination coefficient (96%).
Archivos de …
... Universidad de Córdoba (UCO). Campus de Rabanales. 14071 Córdoba. España. E-mail: pa1gamaa@uc... more ... Universidad de Córdoba (UCO). Campus de Rabanales. 14071 Córdoba. España. E-mail: pa1gamaa@uco.es 2Instituto Andaluz de Investigación y Formación Agraria, Pesquera, Alimentaria y de la Producción Ecológica. CIFA de Hinojosa del Duque. Córdoba. España. ...
Archivos de Zootecnia, 2010
The American Journal of Geriatric Psychiatry, 2014
Objective-To study the association of dementia with APOE-e4 and its interaction with age in a non... more Objective-To study the association of dementia with APOE-e4 and its interaction with age in a nonagenarian Costa Ricans (N-sample) and a general elderly contrast group (GE-sample). Methods-In both case-control studies, participants were cognitively intact or demented. The Nsample (N=112) was at least age 90; the GE-sample (N=98) was at least age 65. Results-Dementia and APOE-e4 were not significantly associated in the N-sample, but were in the GE-sample. There was a significant interaction of age with APOE-e4 in the N-sample, but not in the GE-sample. Descriptively dividing the N-sample at the median (age 93) showed a group