Se hacen diversos análisis teóricos a partir de la revisión crítica de la bibliografía más relevante, particularmente sobre la situación de Microsoft respecto a otras empresas tecnológicas y sobre la relación entre territorio e... more
Se hacen diversos análisis teóricos a partir de la revisión crítica de la bibliografía más relevante, particularmente sobre la situación de Microsoft respecto a otras empresas tecnológicas y sobre la relación entre territorio e innovación. El núcleo principal del artículo lo constituye la realización de una encuesta a los consultores relacionados con la informática de Microsoft Consulting Services (MCS). Respecto a los ámbitos geográficos a los que pertenecen otras empresas con las que tienen relaciones que les ayudan a ser más innovadores, las respuestas más seleccionadas fueron la Unión Europea, España y otras zonas desarrollas del mundo no hispanoparlantes, por este orden. Para la innovación parece fundamental combinar las relaciones externas lejanas y potencialmente dispersas, en que es posible acceder a lo mejor, con las locales que son próximas, concentradas y accesibles. Los empleados de MCS parece que combinan ambas vertientes de la innovación, la global y la localSeveral th...
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Chapter prepared for the Cambridge Handbook of Research Methods in Clinical Psychology. Edited by A. Wright & M. N. Hallquist. We describe models for analyzing data from dyadic systems such as therapist-client, mother-child, or... more
Chapter prepared for the Cambridge Handbook of Research Methods in Clinical Psychology. Edited by A. Wright & M. N. Hallquist. We describe models for analyzing data from dyadic systems such as therapist-client, mother-child, or romantic partners, among others. We define key characteristics of dyadic systems and then identify clinical research questions related to dyadic systems and processes that unfold over time. We use these questions to select a set of statistical models and data analytic techniques for answering clinical research questions related to dyadic research.
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P73 Background: Elevated macromolecule signals, as measured by proton magnetic resonance spectroscopy (MRS) after human stroke, are hypothesized to arise from mobile lipids that accumulate within macrophages. However, their chemical... more
P73 Background: Elevated macromolecule signals, as measured by proton magnetic resonance spectroscopy (MRS) after human stroke, are hypothesized to arise from mobile lipids that accumulate within macrophages. However, their chemical identity, cellular location, and clinical significance remain uncertain. Methods: Adult Wistar rats underwent a 90 minute middle cerebral artery occlusion with reperfusion. Animals survived for 2 to 5 days prior to sacrifice. Immediately after decapitation, 400 μm slices from an infarcted region of forebrain were prepared and perfused in artificial CSF at 36 degrees C, and studied by gradient-enhanced one-dimensional (1D) MRS and by two-dimensional correlation spectroscopy (COSY). Cryostat coronal sections from other, identically prepared rats were stained for lipid (Nile Red) and immunostained for microglia/macrophages (OX42). Results: The 1D spectra from infarcted samples contained broad resonances arising from lipid methylene and other fatty acyl prot...
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En este artículo, sus autores analizan los Condominios Agrarios como una forma asociativa adaptada a las características de la agricultura familiar en el estado brasileño de Santa Catarina. En primer lugar, analizan el proceso de... more
En este artículo, sus autores analizan los Condominios Agrarios como una forma asociativa adaptada a las características de la agricultura familiar en el estado brasileño de Santa Catarina. En primer lugar, analizan el proceso de modernización de la agricultura brasileña que tuvo lugar en los años 60 y 70 bajo los gobiernos militares, prestando atención a sus efectos selectivos y excluyentes sobre los pequeños agricultores. En el marco de dicho proceso, estudian, en segundo lugar, el desarrollo del cooperativismo y muestran la consolidación de un modelo de megacooperativas que refleja los intereses y características de la agricultura modernizada y orientada a la exportación. En el tercer apartado, analizan el contexto de génesis y desarrollo de los Condominios Agrraios como forma alternativa al modelo de las megacooperativas y los sitúan en el contexto de la agricultura de Santa Catarina. Finalmente, los autores reflexionan sobre este modelo de asociacionismo adaptado a las caracter...
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The spread of COVID-19 has led to the disruption of K-12 education for about 90% of the world’s student population. The effects on children’s academic development are unknown. We examined how disruption in schooling over three consecutive... more
The spread of COVID-19 has led to the disruption of K-12 education for about 90% of the world’s student population. The effects on children’s academic development are unknown. We examined how disruption in schooling over three consecutive summers in disadvantaged minority children affects reading and whether an intensive intervention can ameliorate these effects. Our data were collected prior to the COVID-19 pandemic. We applied Latent Change Score models to examine developmental trends in a longitudinal study of reading in 111 economically disadvantaged children, assessed biannually from grades 1 to 4, including 3 summers (for a total of 6 months of school hiatus). The students fell behind the normative population in their ability to understand written texts, a decrease in their relative percentile of 0.25 of a standard deviation each summer, and an effect 3–4 times greater than prior studies suggested. Compared to children in a comparison group, children who received an evidence-b...
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Distribution of the CpG sites studied in the FOXD2 gene and correlation table of the methylation percentages at the 3´ UTR CpG sites with FOXD2 mRNA expression.
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Primer sequences used and PCR conditions for the validation by MSP (including a representative result), CpG pyrosequencing (including the result table), quantitative PCR and details on immunohistochemistry and statistical analysis.
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Positive correlation between mRNA expression of DIO3 and FOXD2 in both non-tumoural and tumoural tissues.
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Research Interests: Geschichte and Geographie
Estrada, E. (2018). Speeded Tests. In B. B. Frey, The SAGE Encyclopedia of Educational Research, Measurement, and Evaluation. 2455 Teller Road, Thousand Oaks, California 91320: SAGE Publications, Inc.... more
Estrada, E. (2018). Speeded Tests. In B. B. Frey, The SAGE Encyclopedia of Educational Research, Measurement, and Evaluation. 2455 Teller Road, Thousand Oaks, California 91320: SAGE Publications, Inc. https://doi.org/10.4135/9781506326139.n652
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Aim of the study: To analyze the impact of the 1998 wildfire on dwarf pine (Pinus culminicola) population stands 18 years after the fire.Area of study: Cerro el Potosí, Nuevo León (México)Material and methods: We measured regeneration,... more
Aim of the study: To analyze the impact of the 1998 wildfire on dwarf pine (Pinus culminicola) population stands 18 years after the fire.Area of study: Cerro el Potosí, Nuevo León (México)Material and methods: We measured regeneration, biovolume of individuals, diversity and species composition in unburned and burned plots randomly selected in the area.Main results: Recovery was very slow, with limited dense natural regeneration and very slow growth. Significant differences between control and burned plots were found with respect to regeneration, species composition, evenness and soil nutrients, suggesting that fire could promote natural regeneration and biodiversity in these communities.Research highlights: Management efforts are necessary to maintain a natural fire regime and ensure grazing exclusion in order to favor the conservation of the community dominated by this rare species P. culminicola.
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Estrada, E. (2018). Power Tests. In B. B. Frey, The SAGE Encyclopedia of Educational Research, Measurement, and Evaluation. 2455 Teller Road, Thousand Oaks, California 91320: SAGE Publications, Inc.... more
Estrada, E. (2018). Power Tests. In B. B. Frey, The SAGE Encyclopedia of Educational Research, Measurement, and Evaluation. 2455 Teller Road, Thousand Oaks, California 91320: SAGE Publications, Inc. https://doi.org/10.4135/9781506326139.n533
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En este artículo, su autor analiza las nuevas orientaciones de la política de desarrollo rural en la UE, tras más de una década de experiencia de la iniciativa Leader y de diferenciación de la Política Agraria Común (PAC) en dos pilares:... more
En este artículo, su autor analiza las nuevas orientaciones de la política de desarrollo rural en la UE, tras más de una década de experiencia de la iniciativa Leader y de diferenciación de la Política Agraria Común (PAC) en dos pilares: el primero, para la regulación de los mercados en el marco de las OCMs; y el segundo, para la modernización y mejora de las explotaciones agrarias y la promoción de actividades más respetuosas con el medio ambiente en el marco del programa agroambiental. En opinión del autor, el nuevo Reglamento de desarrollo rural y la creación de un nuevo fondo (el FEADER) suponen una oportunidad para integrar las dimensiones agraria y territorial del desarrollo y evitar la tendencia a la disociación de los agricultores respecto al conjunto de la población rural. El amplio margen de maniobra de los gobiernos nacionales y regionales en la aplicación del citado reglamento significa que los temas agrarios y rurales vuelven a situarse en el centro de las agendas políti...
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BACKGROUND Although average-based effect size (ES) and percentage of individual changes (PIC) are quite different, they are not independent: larger ESs lead to higher PICs. However, this association has not been sufficiently explored.... more
BACKGROUND Although average-based effect size (ES) and percentage of individual changes (PIC) are quite different, they are not independent: larger ESs lead to higher PICs. However, this association has not been sufficiently explored. METHOD We analyzed this association based on data simulated in the context of a pre-post design, with and without control groups. We simulated various distributions, sample sizes, degrees of test-retest reliability, effect sizes, and different variances in pre- and post-test. RESULTS The PIC is closely associated with the ES across a wide variety of empirically frequent scenarios. In the "single group pre-post designs", the linear regression model shows R2 values above 0.90. In the "control group pre-post designs", the linear regression model shows R2 values above 0.80. These results were found even when the post-test variability differed from that of the pre-test, replicating, extending and generalizing the findings in previous stu...
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El aceite de oregano mexicano (AO; Lippia berlandieri Schauer) es un extracto de origen natural. El objetivo de este estudio fue evaluar el efecto sobre las caracteristicas de la canal y la carne de pollos alimentados con dietas... more
El aceite de oregano mexicano (AO; Lippia berlandieri Schauer) es un extracto de origen natural. El objetivo de este estudio fue evaluar el efecto sobre las caracteristicas de la canal y la carne de pollos alimentados con dietas adicionadas con AO. Se utilizaron 162 pollos de 1 d de edad (Ross), alojados en jaulas (30 x 33 x 44 cm) con dos pollos cada una (nueve jaulas por tratamiento), distribuidos aleatoriamente en un arreglo factorial 32 de tratamientos; AOC, aceite de oregano basado en Carvacrol (60.0 %), y AOT, aceite de oregano basado en Timol (40.0 %). Ambos AO se probaron en niveles de 0, 400 y 800 mg L −1 . El tratamiento 800-0 incremento (p < 0.05) el peso vivo (2.25 kg), 800-800 el rendimiento de la canal caliente y fria, mientras que el contenido de visceras disminuyo (p < 0.05); pierna y espalda fueron mayores (p < 0.05) en 400-400, cadera y alas en 800-400. El tratamiento 0-400 aumento el muslo; la pechuga no fue afectada estadisticamente, pero 400-0 tuvo el v...
Research Interests: Biology and Essential Oil
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Accelerated longitudinal designs (ALDs) allow examining developmental changes over a period of time longer than the duration of the study. In ALDs, participants enter the study at different ages (i.e., different cohorts), and provide... more
Accelerated longitudinal designs (ALDs) allow examining developmental changes over a period of time longer than the duration of the study. In ALDs, participants enter the study at different ages (i.e., different cohorts), and provide measures during a time frame shorter than the total study. They key assumption is that participants from the different cohorts come from the same population and, therefore, can be assumed to share the same general trajectory. The consequences of not meeting that assumption have not been examined systematically. In this paper, we propose an approach to detect and control for cohort differences in ALDs using Latent Change Score models in both discrete and continuous time. We evaluated the effectiveness of such a method through a Monte Carlo study. Our results indicate that, in a broad set of empirically relevant conditions, both LCS specifications can adequately estimate cohort effects ranging from very small to very large, with slightly better performanc...
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This paper represents a preliminary study of the botany, natural history and taxane chemistry of the Mexican yew, Taxus globosa Schltdl. Taxonomic history, morphological comparison to other North American species and ecological habitat... more
This paper represents a preliminary study of the botany, natural history and taxane chemistry of the Mexican yew, Taxus globosa Schltdl. Taxonomic history, morphological comparison to other North American species and ecological habitat are discussed. Chemical study involved leaf and twig material from forty-nine plants from three localities in Mexico. Levels of taxol, cephalomannine and baccatin III were determined by HPLC analysis. Intrapopulational variation was found to be very high while mean taxane levels for each of the three populations were very similar. The average percentage of taxol in leaves of T. globosa is higher than in all other species of Taxus (0.0121% dry wt.).
Research Interests: Botany, Conservation, Taxonomy, Biology, Natural History, and 4 moreTaxus, North American, Botanical Sciences, and Twig
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Chapter (accepted and in press) prepared for the forthcoming Cambridge Handbook of Research Methods in Clinical Psychology. Edited by A. Wright & M. N. Hallquist. We describe models for analyzing data from dyadic systems such as... more
Chapter (accepted and in press) prepared for the forthcoming Cambridge Handbook of Research Methods in Clinical Psychology. Edited by A. Wright & M. N. Hallquist. We describe models for analyzing data from dyadic systems such as therapist-client, mother-children, or romantic partners, among others. We define key characteristics of dyadic systems and then identify clinical research questions related to dyadic systems and processes that unfold over time. We use these questions to select a set of statistical models and data analytic techniques for answering clinical research questions related to dyadic research.
Research Interests: Psychology and Wright
Identifying change at the individual level is an important goal for researchers, educators, and clinicians. We present a set of statistical procedures for identifying individuals who depart from a normative change. Using Latent Change... more
Identifying change at the individual level is an important goal for researchers, educators, and clinicians. We present a set of statistical procedures for identifying individuals who depart from a normative change. Using Latent Change Scores models (LCS), we illustrate how the Individual Likelihood computed from a statistical model for change (IL) and from an alternative unrestricted model (ILsat) can be used to identify atypical trajectories in situations with several measurement occasions. Using LCS and linear regression, we also show how the observed and latent change residuals can be used to identify atypical individual change between 2 measurement occasions. We apply these methods to a measure of general verbal ability (from WISC–R), from a large sample of individuals assessed every 2 years from Grade 1 to 9. We demonstrate the efficiency of these techniques, illustrate their use to identify individual change in longitudinal data, and discuss potential applications in developme...
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Cognitive training and brain stimulation studies have suggested that human cognition, primarily working memory and attention control processes, can be enhanced. Some authors claim that gains (i.e., post-test minus pretest scores) from... more
Cognitive training and brain stimulation studies have suggested that human cognition, primarily working memory and attention control processes, can be enhanced. Some authors claim that gains (i.e., post-test minus pretest scores) from such interventions are unevenly distributed among people. The magnification account (expressed by the evangelical "who has will more be given") predicts that the largest gains will be shown by the most cognitively efficient people, who will also be most effective in exploiting interventions. In contrast, the compensation account ("who has will less be given") predicts that such people already perform at ceiling, so interventions will yield the largest gains in the least cognitively efficient people. Evidence for this latter account comes from reported negative correlations between the pretest and the training/stimulation gain. In this paper, with the use of mathematical derivations and simulation methods, we show that such correlati...
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This article is about collaboration between students and professors on environmental justice research in digital humanities labs. A collective of university students and their professor investigated digital archives pertaining to the... more
This article is about collaboration between students and professors on environmental justice research in digital humanities labs. A collective of university students and their professor investigated digital archives pertaining to the Civilian Conservation Corps (CCC) using mind mapping software called XMind. Our purpose was to enable and organize findings on segregation and discrimination within CCC camps. The impact this research had on students who came from interdisciplinary backgrounds was exposure to the use of technological resources in the context of an increasing need to use technology to preserve historical archives, carry out research, and make connections to other research on the topic of environmental justice. Interdisciplinary in their approach, students used mind mapping software to organize data visually. Lab members recognized that visualization of information allowed students to think about how to organize information using methods of historical analysis. It al...
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Se estudió la diversidad de especies de leguminosas en el norte del estado de Nuevo León, contabilizando 98 taxa en total. Se registraron 38 géneros, 94 especies y 26 taxa infraespecíficos de este grupo de plantas; la familia Fabaceae... more
Se estudió la diversidad de especies de leguminosas en el norte del estado de Nuevo León, contabilizando 98 taxa en total. Se registraron 38 géneros, 94 especies y 26 taxa infraespecíficos de este grupo de plantas; la familia Fabaceae comprende 18 géneros y 42 especies, Mimosaceae 10 y 30 y Caesalpiniaceae 10 y 22 respectivamente. Los géneros con mayor número de especies son Acacia (12), Dalea (10), Mimosa (6), Senna (5);Caesalpinia(4) y Bauhinia (4). Del total de 98 taxa, las leguminosas arbustivas y herbáceas son las más abundantes en la zona, representando 47% (46 especies) y 46% (45 especies) respectivamente, las arbóreas representan 7% (7). La mayor cantidad de taxa se registró en el matorral subinerme (52), matorral submontano (48) y bosque de encino-pino (44), mientras que los mezquitales albergan el menor número de especies (23).
Research Interests: Diversity, Biology, Mexico, México, Flora, and 8 moreLegumes, Oak, DIVERSIDAD, Fabaceae, MEXICO, Leguminosas, Nuevo León, and Pine Forest
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The importance of sensors has grown dramatically through the years, specially since they have the capability to create a specific task. Multiple sensor fusion is an area that has rapidly grown due to its multiple and beneficial... more
The importance of sensors has grown dramatically through the years, specially since they have the capability to create a specific task. Multiple sensor fusion is an area that has rapidly grown due to its multiple and beneficial applications. It is common to develop devices that have multiple sensors; however, the fusion of these multiple sensors to make a single output is remarkable. In fact, this is the way people chose to try to model the human body which has innumerable sensors and makes one decision. The development of sensor fusion not only helps create innovations in technology, but has the potential in diagnosing several medical conditions. Some of these medical conditions such as Parkinson\u27s disease and strokes may affect the way a person walks. Here, we will develop a multiple sensor device that records the ground reaction force in the foot and the way a person walks and can detect anomalies
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Research Interests: Geography and Humanities
A diferencia de lo que ocurría en el periodo álgido de la modernización productiva allá por los años 60, cuando se promovía el éxodo rural y se incentivaba incluso la salida de activos de la agricultura y el medio rural para favorecer el... more
A diferencia de lo que ocurría en el periodo álgido de la modernización productiva allá por los años 60, cuando se promovía el éxodo rural y se incentivaba incluso la salida de activos de la agricultura y el medio rural para favorecer el crecimiento industrial, hoy la existencia de territorios rurales vivos, dinámicos y bien cohesionados social y económicamente, se valora como un elemento fundamental de los modelos de desarrollo sostenible. El valor que se le atribuye a los territorios rurales no radica sólo en su contribución al desarrollo equilibrado de un país, sino también porque ayudan a preservar el paisaje y el medio ambiente y porque son base fundamental para la conservación de la diversidad cultural. Las áreas rurales de la Unión Europea son un buen ejemplo, habiendo sido el principal destinatario de un conjunto de políticas públicas marcadas todas ellas por el objetivo de la cohesión territorial, y financiadas por diversos fondos estructurales.Peer Reviewe