The predictability of advection-dominated flux-transport solar dynamo models

Space weather is a matter of practical importance in our modern society. Predictions of forecoming solar cycles mean amplitude and duration are currently being made based on flux-transport numerical models of the solar dynamo. Interested in the forecast horizon of such studies, we quantify the predictability window of a representative, advection-dominated, flux-transport dynamo model by investigating its sensitivity to initial conditions and control parameters through a perturbation analysis. We measure the rate associated with the exponential growth of an initial perturbation of the model trajectory, which yields a characteristic time scale known as the e-folding time $\tau_e$. The e-folding time is shown to decrease with the strength of the $\alpha$-effect, and to increase with the magnitude of the imposed meridional circulation. Comparing the e-folding time with the solar cycle periodicity, we obtain an average estimate for $\tau_e$ equal to 2.76 solar cycle durations. From a practical point of view, the perturbations analysed in this work can be interpreted as uncertainties affecting either the observations or the physical model itself. After reviewing these, we discuss their implications for solar cycle prediction.Comment: 33 pages, 12 figure

A mean-field Babcock-Leighton solar dynamo model with long-term variability

Dynamo models relying on the Babcock-Leighton mechanism are successful in reproducing most of the solar magnetic field dynamical characteristics. However, considering that such models operate only above a lower magnetic field threshold, they do not provide an appropriate magnetic field regeneration process characterizing a self-sustainable dynamo. In this work we consider the existence of an additional \alpha-effect to the Babcock-Leighton scenario in a mean-field axisymmetric kinematic numerical model. Both poloidal field regeneration mechanisms are treated with two different strength-limiting factors. Apart from the solar anti-symmetric parity behavior, the main solar features are reproduced: cyclic polarity reversals, mid-latitudinal equatorward migration of strong toroidal field, poleward migration of polar surface radial fields, and the quadrature phase shift between both. Long-term variability of the solutions exhibits lengthy periods of minimum activity followed by posterior recovery, akin to the observed Maunder Minimum. Based on the analysis of the residual activity during periods of minimum activity, we suggest that these are caused by a predominance of the \alpha-effect over the Babcock-Leighton mechanism in regenerating the poloidal field.Comment: 21 pages, 6 figure

Leadership and Communication as Opportunities for Growth: Refining Discipline with Cross Cultural Relationships beyond the Classroom

Overt disciplinary tactics disproportionately affect scholars of color. This field project aims to shed light on discipline policies across a variety of learning environments and provide scholars of color with the opportunity to self-advocate. I utilize a culturally relevant pedagogy in my framework component to stress the need for reciprocal relationships based on dignity and mutual respect. I provide effective alternative strategies, framed by culturally relevant pedagogy (CRP) and Gregory and Mosely’s theory of culturally relevant discipline (CRD), for addressing misconduct that emphasize stronger communication and greater leadership opportunities. My project consists of three parts: a modified communications policy in alignment with discipline guidelines at my work site, a core values rubric and a leadership council application packet that can be utilized across different learning environments that work to promote positive youth engagement. It is vital that schools offer a fair and supportive system of discipline that does not intentionally or unintentionally undermine the cultural, emotional, and mental well being of scholars of color by engaging in overly punitive discipline measures. Keywords: disproportionate discipline, reciprocal relationships, scholars of color, hegemony, consistent communication

Genome wide comparative analysis of the effects of PRMT5 and PRMT4/CARM1 arginine methyltransferases on the Arabidopsis thaliana transcriptome

BACKGROUND: Methylation at arginine residues (R) is an important post-translational modification that regulates a myriad of essential cellular processes in eukaryotes, such as transcriptional regulation, RNA processing, signal transduction and DNA repair. Arginine methylation is catalyzed by a family of enzymes known as protein arginine methyltransferases (PRMTs). PRMTs are classified as Type I or Type II, depending on the position of the methyl group on the guanidine of the methylated arginine. Previous reports have linked symmetric R methylation to transcriptional repression, while asymmetric R methylation is generally associated with transcriptional activation. However, global studies supporting this conclusion are not available. RESULTS: Here we compared side by side the physiological and molecular roles of the best characterized plant PRMTs, the Type II PRMT5 and the Type I PRMT4, also known as CARM1 in mammals. We found that prmt5 and prmt4a;4b mutants showed similar alterations in flowering time, photomorphogenic responses and salt stress tolerance, while only prmt5 mutants exhibited alterations in circadian rhythms. An RNA-seq analysis revealed that expression and splicing of many differentially regulated genes was similarly enhanced or repressed by PRMT5 and PRMT4s. Furthermore, PRMT5 and PRMT4s co-regulated the expression and splicing of key regulatory genes associated with transcription, RNA processing, responses to light, flowering, and abiotic stress tolerance, being candidates to mediate the physiological alterations observed in the mutants. CONCLUSIONS: Our global analysis indicates that two of the most important Type I and Type II arginine methyltransferases, PRTM4 and PRMT5, have mostly overlapping as well as specific, but not opposite, roles in the global regulation of gene expression in plants.Fil: Hernando, Carlos Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Sanchez, Sabrina Elena. University of Southern California; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Mancini, Estefania. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Yanovsky, Marcelo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; Argentin

Potential sources of sexuality in Cenchrus ciliaris L.: Seed fertility, environment and its implication in plant breeding

PosterCenchrus ciliaris L. is an aposporic and pseudogamous apomictic species, and fully sexual plants are very rare or absent. Fertility, which seems to be influenced by environmental factors, is a character of interest for selection of putative maternal sources for hybridizations.Instituto de Fisiología y Recursos Genéticos VegetalesFil: Sanchez, Miguel Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Estudios Agropecuarios (UDEA); ArgentinaFil: Sanchez, Miguel Alejandro. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales; ArgentinaFil: Bruno, C. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Estadística y Biometría; ArgentinaFil: Bruno, C. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Fitopatología y Modelización Agrícola (UFyMA); ArgentinaFil: Grunberg, Karina. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales; ArgentinaFil: Grunberg, Karina.Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Estudios Agropecuarios (UDEA); ArgentinaFil: Griffa, Sabrina Mariana. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales; ArgentinaFil: Griffa, Sabrina Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Estudios Agropecuarios (UDEA); Argentin

La responsabilidad social empresarial y la visión estratégica en la Gerencia Desarrollo Social de la Municipalidad de San Juan de Lurigancho en el año 2020

La Responsabilidad Social Empresarial en la actualidad es un tema que dejo de ser tendencia para convertirse en una necesidad real que constituye el compromiso y la acción social que realizan las organizaciones en favor de la comunidad. En razón a lo mencionado la presente investigación titulada La Responsabilidad social empresarial y la visión estratégica en la Gerencia Desarrollo Social de la Municipalidad de San Juan de Lurigancho en el año 2020, tiene como objetivo principal determinar la correlación que existe entre la responsabilidad social empresarial y la visión estratégica en la Gerencia Desarrollo Social de la Municipalidad de San Juan de Lurigancho. La presente investigación metodológicamente es cuantitativa, de tipo descriptiva y su nivel es correlacional. Para dar cumplimiento al objetivo se planteó como instrumento la encuesta, la cual fue validada por especialista del área, permitiendo el hallazgo de resultados importantes que posteriormente fueron analizados para concluir que existe relación entre la Responsabilidad Social Empresarial y la Visión Estratégica. Esta conclusión puede ayudar de forma responsable a generar en la Municipalidad una Responsabilidad Social Empresarial con Visión Estratégica.Corporate Social Responsibility at present is a topic that is gaining momentum because it constitutes the commitment and social actions that organizations make for the community, for this reason the present research entitled Corporate Social Responsibility and the strategic vision in Development Management Social Development of the Municipality of San Juan de Lurigancho in 2020, it main objective is to determine the correlation that exists between corporate social responsibility as a strategic vision with the Social Development Management of the Municipality of San Juan de Lurigancho in 2020. The present research methodologically is quantitative, descriptive and its level is correlational. To comply with the objective, the survey was proposed as an instrument, which was validated by a specialist in the area, allowing the discovery of important results that were later analyzed to conclude that there is a relationship between Corporate Social Responsibility and the Strategic Vision. This conclusion can help in a responsible way to generate in the Municipality a Corporate Social Responsibility with a Strategic Vision

La relación entre responsabilidad social empresarial y la inserción laboral de personas con discapacidad en un gobierno local de Lima en el año 2022

La presente investigación tuvo como objetivo principal determinar la relación entre la responsabilidad social empresarial y la inserción laboral de personas con discapacidad en un Gobierno Local de Lima en el año 2022 y para lograrlo se aplicó la técnica de la encuesta y como instrumento de investigación un cuestionario de elaboración propia. Como resultado se obtuvo una relación altamente significativa entre las variables de investigación. Se concluye que existe una relación entre ambas variables la misma que nos permite brindar un desarrollo sostenible para el gobierno local y este sirva como ejemplo a todos los grupos de interés para mejorar las políticas públicas en cuanto a temas de discapacidad; de esta forma se realicen sinergias para la búsqueda de visiones estratégicas con valores éticos a favor de la comunidad.The main objective of this research was to determine the relationship between corporate social responsibility and the labor insertion of people with disabilities in a Local Government of Lima in the year 2022 and to achieve this, the survey technique was applied and a questionnaire was used as a research instrument. self-made. As a result, a highly significant relationship was obtained between the research variables. It is concluded that there is a relationship between both variables, which allows us to provide sustainable development for the local government and this serves as an example to all interest groups to improve public policies regarding disability issues; In this way, synergies are realized for the search for strategic visions with ethical values in favor of the community

La responsabilidad social empresarial como una visión estratégica: una revisión sistemática de la literatura científica de los últimos 10 años

El presente trabajo de investigación sobre la Responsabilidad social empresarial como una visión estratégica”: una revisión sistemática de la literatura científica de los últimos 10 años juega un papel importante en el ámbito empresarial cuando esta se complementa con las actividades de Responsabilidad Social y a la esta comienza con un análisis de las distintas investigaciones que se han realizado sobre el tema. Por consiguiente, los resultados de dicha revisión literaria nos permiten conocer causas, determinar consecuencias y/o proponer visión estratégica, como parte de la transformación interna y externa que esta produce, así como también buscar el criterio, lineamiento para comprender el desarrollo y sostenibilidad del ámbito social con relación a la Responsabilidad Social empresarial. El objetivo de la presente investigación fue realizar una revisión sistemática de la literatura basada en revistas científicas, artículos, investigaciones y publicaciones científicas sobre Responsabilidad Empresarial, visión estratégica, entre otros temas relaciones al trabajo de investigación para buscar mejorar, desarrollar estrategias y planes de acción cuya propuesta de solución es mantener una evolución constante de la RSE. La búsqueda de información se realizó en la base de datos de revistas y artículos científicos del diseño de investigación tales como Scielo (http://www.scielo.org), Google académico, entre otros

Environmental influence on reproductive traits of buffel grass facultative apomictic genotypes and its implication in plant breeding

Cenchrus ciliaris L., a perennial C4 grass, is one of the most widely used forage species in warm and dry regions worldwide. The widespread use of the cultivar Texas raises concerns about genetic homogeneity and vulnerability. Hybridizations among facultative individuals could widen the genic pool. Therefore, a reproductive characterization of available genotypes is required. The objective of this study was to determine the reproductive mode, potential sexual expressivity, and seed fertility of four facultative apomictic genotypes throughout the flowering season, considering the influence of bioclimatic variables. We assessed the reproductive mode and potential sexual expressivity using the pistil clearing technique and seed fertility based on the production of seeds per panicle under open pollination and self-pollination. All the assessed genotypes behaved mainly as out-crossers throughout the flowering season and showed the highest potential sexual expressivity at the beginning of flowering. We confirmed the environmental influence on reproductive traits. At the beginning of the flowering season, the facultative apomictic genotypes exhibited the highest potential as female parent for hybridizations programs.Instituto de Fisiología y Recursos Genéticos VegetalesFil: Sanchez, Miguel Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Estudios Agropecuarios (UDEA); ArgentinaFil: Sanchez, Miguel Alejandro. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales; ArgentinaFil: Bruno, Cecilia. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Estadística y Biometría; ArgentinaFil: Bruno, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Fitopatología y Modelización Agrícola (UFyMA); ArgentinaFil: Bruno, Cecilia. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Patología Vegetal; ArgentinaFil: Quiroga, Mariana Paola. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales; ArgentinaFil: Quiroga, Mariana Paola. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Estudios Agropecuarios (UDEA) ; ArgentinaFil: Grunberg, Karina. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales; ArgentinaFil: Grunberg, Karina. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Estudios Agropecuarios (UDEA) ; ArgentinaFil: Griffa, Sabrina Mariana. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales; ArgentinaFil: Griffa, Sabrina Mariana. Consejo Nacional de Investigaciones Científicas y Técnicas. Unidad de Estudios Agropecuarios (UDEA) ; Argentin

The Effects of Different Intensities on Eccentric Cycling Blood Flow Patterns at a Concentric Cycling Workload Match

Decrease of blood flow to tissues, due to plaque built by atherosclerosis, increases mortality and morbidity. Homeostatic balance in the vascular system depends directly on endothelial cells, and blood flow, better known as endothelial sheer stress (ESS). Different types of blood flow patterns have been established measured by Reynolds number (Re), and turbulent flow has been associated with the decrease of ESS. Eccentric exercise (ECC) has gained attention as a novel exercise modality that increases muscle performance without increasing metabolic demands; however, little is known about ESS during ECC. PURPOSE: To determine the effects of ECC cycling in blood flow patterns in young, apparently healthy individuals. METHODS: 18 apparently healthy participants, were recruited for two laboratory visits. First visit served to obtain maximum oxygen consumption and peak power (PP), to determine workload intensities, followed by a 5-min familiarization on eccentric ergometer. Second visit on eccentric ergometer assessed blood flow patterns (i.e. ESS and Re measured via imaging ultrasound and Doppler) during a 3-workload steady exercise test at low, moderate, and high intensities. RESULTS: There was an interaction of exercise intensity on antegrade ESS (F(3,53.7)=26.90, p\u3c0.001), but not Sex (p\u3e0.05), and a random effect of participant (p\u3c0.001) and Re anterograde (F(3,53.6)=25.03, p\u3c0.001), but not Sex or random effect of participant (p\u3e0.05). There was an interaction of condition on retrograde ESS (F(3,53.4)=11.21, p\u3c0.001), but not Sex (p\u3e0.05), and a random effect of participant (p\u3c0.001). and Re retrograde (F(3,54.3)=12.34, p\u3c0.001), Sex (F(1,18.5)=4.41, p=0.05), and random effect of participant (p\u3e0.05). CONCLUSION: Eccentric cycling exercise produces exercise-induced blood flow patterns that are intensity-dependent in males and females and these patterns are similar to traditional concentric cycling