Modelo predictivos de la deserción estudiantil en una universidad privada del Perú

La deserción es un problema que afecta alas universidades, públicas y privadas, y que generan una serie de consecuencias negativas para las instituciones, así como para los mismos jóvenes porque tendrán menos posibilidades de conseguir un empleo que permita bridarles una mejor calidad de vida a sus familias, por ello, el objetivo de este estudio fue determinar cómo el uso de modelos predictivos en asignaturas críticas contribuye a identificar a los estudiantes en riesgo de deserción. Se diseñaron siete modelos predictivos con la metodología CRISP (Cross-Industry Standard Process for Data Mining) y el historial académico de los estudiantes, para ser aplicados en siete cursos críticos. Entre los principales resultados se puede destacar que los modelos predictivos contribuyeron a reducir en un 40 % y 50 % los niveles de desaprobación y las variables que mejor la predijeron fueron la carrera que estudian (vocación), el número de veces que se matriculan en la asignatura y la nota que tuvieron en matemática o comunicación cuando cursaron el quinto año del nivel secundaria.Tesi

Predictive models of student desertion at a private Peruvian university

La deserción es un problema que afecta a las universidades, públicas y privadas, y acarrea una serie de consecuencias negativas tanto para las instituciones como para los mismos jóvenes, por ello, el objetivo de este estudio fue determinar cómo el uso de modelos predictivos en asignaturas críticas contribuye a identificar a los estudiantes en riesgo de deserción. Se diseñaron siete modelos predictivos con la metodología CRISP (Cross-Industry Standard Process for Data Mining) y el historial académico de los estudiantes, para ser aplicados en siete cursos. Entre los principales resultados se puede destacar que los modelos predictivos contribuyeron a reducir en un 25 % y 40 % los niveles de desaprobación y las variables que mejor la predijeron fueron la carrera que estudian (vocación), el número de veces que se matriculan en la asignatura y la nota que tuvieron en matemática o comunicación cuando cursaron el quinto año de secundaria.Desertion is a problem that affects public and private universities, and leads to a series of negative consequences for both institutions and students. Therefore, the objective of this study was to determine how the use of predictive models in low pass-rate courses helps to identify students at risk of desertion. Seven predictive models were designed using CRISP (Cross- Industry Standard Process for Data Mining) methodology and students’ academic records to be applied in seven low pass-rate courses. Among the main results, it can be noted that predictive models contributed to the reduction of fail rates by 25% and 40%, and that the variables that best forecast desertion were career choice (vocation), number of times students enrolled in the course, and grades obtained in mathematics or language arts when students attended the fifth year of high school

Pod indehiscence is a domestication and aridity resilience trait in common bean.

Plant domestication has strongly modified crop morphology and development. Nevertheless, many crops continue to display atavistic characteristics that were advantageous to their wild ancestors but are deleterious under cultivation, such as pod dehiscence (PD). Here, we provide the first comprehensive assessment of the inheritance of PD in the common bean (Phaseolus vulgaris), a major domesticated grain legume. Using three methods to evaluate the PD phenotype, we identified multiple, unlinked genetic regions controlling PD in a biparental population and two diversity panels. Subsequently, we assessed patterns of orthology among these loci and those controlling the trait in other species. Our results show that different genes were selected in each domestication and ecogeographic race. A chromosome Pv03 dirigent-like gene, involved in lignin biosynthesis, showed a base-pair substitution that is associated with decreased PD. This haplotype may underlie the expansion of Mesoamerican domesticates into northern Mexico, where arid conditions promote PD. The rise in frequency of the decreased-PD haplotype may be a consequence of the markedly different fitness landscape imposed by domestication. Environmental dependency and genetic redundancy can explain the maintenance of atavistic traits under domestication

Adaptation and diversity along an altitudinal gradient in Ethiopian barley (Hordeum vulgare L.) landraces revealed by molecular analysis

<p>Abstract</p> <p>Background</p> <p>Among the cereal crops, barley is the species with the greatest adaptability to a wide range of environments. To determine the level and structure of genetic diversity in barley (<it>Hordeum vulgare </it>L.) landraces from the central highlands of Ethiopia, we have examined the molecular variation at seven nuclear microsatellite loci.</p> <p>Results</p> <p>A total of 106 landrace populations were sampled in the two growing seasons (<it>Meher </it>and <it>Belg</it>; the long and short rainy seasons, respectively), across three districts (Ankober, Mojanawadera and Tarmaber), and within each district along an altitudinal gradient (from 1,798 to 3,324 m a.s.l). Overall, although significant, the divergence (e.g. F_ST) is very low between seasons and geographical districts, while it is high between different classes of altitude. Selection for adaptation to different altitudes appears to be the main factor that has determined the observed clinal variation, along with population-size effects.</p> <p>Conclusions</p> <p>Our data show that barley landraces from Ethiopia are constituted by highly variable local populations (farmer's fields) that have large within-population diversity. These landraces are also shown to be locally adapted, with the major driving force that has shaped their population structure being consistent with selection for adaptation along an altitudinal gradient. Overall, our study highlights the potential of such landraces as a source of useful alleles. Furthermore, these landraces also represent an ideal system to study the processes of adaptation and for the identification of genes and genomic regions that have adaptive roles in crop species.</p

Factores que permitan el desarrollo del ecoturismo en los parques nacionales del Perú : una investigación exploratoria

En los últimos años, el ser humano ha tomado cada vez mayor conciencia del daño que está ocasionándose a sí mismo, a través de la contaminación del medio ambiente. Entonces están surgiendo corrientes ecologistas que buscan la preservación de aquellas áreas naturales con la finalidad de mantener intactas algunas zonas de nuestro planeta, en las que el hombre no pueda ni deba causar daño alguno

Factores que permitan el desarrollo del ecoturismo en los parques nacionales del Perú : una investigación exploratoria

En los últimos años, el ser humano ha tomado cada vez mayor conciencia del daño que está ocasionándose a sí mismo, a través de la contaminación del medio ambiente. Entonces están surgiendo corrientes ecologistas que buscan la preservación de aquellas áreas naturales con la finalidad de mantener intactas algunas zonas de nuestro planeta, en las que el hombre no pueda ni deba causar daño alguno.Tesi

El cuerpo de Eva en Tomás de Aquino

La constitución del primer cuerpo femenino o el cuerpo de Eva tiene planteos que conllevan problemáticas metafísicas y físicas diversas que han derivado en consecuencias sociales y culturales para la mujer que han atravesado los siglos y llegan hasta la actualidad. La no existencia de progenitores, exige del Aquinate respuestas que exceden lo meramente antropológico y biológico y le conduce a la búsqueda de respuestas más profundas, que, muchas veces están entrelazadas con afirmaciones de carácter teológico y religioso. Tomás de Aquino brinda respuestas de razón aunque el trasfondo sea de fe, e inclusive, con interpretaciones literales de las Sagradas Escrituras actualmente ya abandonadas. No obstante esto, el Aquinate realiza un verdadero esfuerzo intelectual para encontrar respuestas en un ámbito meramente racional pues la materialidad del cuerpo de la primera mujer trae dificultades para su dilucidación y entendimiento. Como en otras partes de su extensa obra, Tomás de Aquino, sigue las obras biológicas y físicas de Aristóteles. Si bien el fondo es aristotélico está en consonancia con el trasfondo cristiano, pues, el Aquinate muestra su extraordinaria capacidad de síntesis entre la fe recibida y la razón argumentada, entre la revelación (y en especial las Sagradas Escrituras en este caso) y los principios de razón.The constitution of the first female body or the body of Eva presents several physical and metaphysical problems, problems that have gone through the centuries and reach the present, generating social and cultural consequences for women. The non-existence of parents demands from Aquino answers that go beyond the anthropological and biological and lead to the search of philosophical answers intertwined with the theological ones. Thomas Aquinas provides rational answers although the background is of faith, and even, with literal interpretations of the Sacred Scriptures now abandoned. The Aquinate makes an intellectual effort to find answers in a rational field because the matter of the body of the first woman brings difficulties for its elucidation and understanding. As in other parts of his extensive work, Thomas Aquinas, follows the biological and physical works of Aristotle. Although the Aristotelian background is in line with Christian thought, Aquinas shows his extraordinary capacity for synthesis between the faith received and reason argued, between revelation (and especially the Holy Scriptures in this case) and the principles of reason

Toward an Evolved Concept of Landrace

[EN] The term "landrace" has generally been defined as a cultivated, genetically heterogeneous variety that has evolved in a certain ecogeographical area and is therefore adapted to the edaphic and climatic conditions and to its traditional management and uses. Despite being considered by many to be inalterable, landraces have been and are in a constant state of evolution as a result of natural and artificial selection. Many landraces have disappeared from cultivation but are preserved in gene banks. Using modern selection and breeding technology tools to shape these preserved landraces together with the ones that are still cultivated is a further step in their evolution in order to preserve their agricultural significance. Adapting historical landraces to present agricultural conditions using cutting-edge breeding technology represents a challenging opportunity to use them in a modern sustainable agriculture, as an immediate return on the investment is highly unlikely. Consequently, we propose a more inclusive definition of landraces, namely that they consist of cultivated varieties that have evolved and may continue evolving, using conventional or modern breeding techniques, in traditional or new agricultural environments within a defined ecogeographical area and under the influence of the local human culture. This includes adaptation of landraces to new management systems and the unconscious or conscious selection made by farmers or breeders using available technology. In this respect, a mixed selection system might be established in which farmers and other social agents develop evolved landraces from the variability generated by public entities.This work has been partially funded by the European Union's Horizon 2020 research and innovation program under grant agreements no. 634651 (TRADITOM) and no. 677379 (G2PSOL).Casañas Artigas, F.; Simo, J.; Casals, J.; Prohens Tomás, J. (2017). Toward an Evolved Concept of Landrace. 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Screening for resistance to four fungal diseases and associated genomic regions in a snap bean diversity panel

Anthracnose, white mold, powdery mildew, and root rot caused by Colletotrichum lindemuthianum, Scletorinia sclerotiorum, Erysiphe spp., and Pythium ultimum, respectively, are among the most frequent diseases that cause significant production losses worldwide in common bean (Phaseolus vulgaris L.). Reactions against these four fungal diseases were investigated under controlled conditions using a diversity panel of 311 bean lines for snap consumption (Snap bean Panel). The genomic regions involved in these resistance responses were identified based on a genome-wide association study conducted with 16,242 SNP markers. The highest number of resistant lines was observed against the three C. lindemuthianum isolates evaluated: 156 lines were resistant to CL124 isolate, 146 lines resistant to CL18, and 109 lines were resistant to C531 isolate. Two well-known anthracnose resistance clusters were identified, the Co-2 on chromosome Pv11 for isolates CL124 and CL18, and the Co-3 on chromosome Pv04 for isolates CL124 and C531. In addition, other lesser-known regions of anthracnose resistance were identified on chromosomes Pv02, Pv06, Pv08, and Pv10. For the white mold isolate tested, 24 resistant lines were identified and the resistance was localized to three different positions on chromosome Pv08. For the powdery mildew local isolate, only 12 resistant lines were identified, and along with the two previous resistance genes on chromosomes Pv04 and Pv11, a new region on chromosome Pv06 was also identified. For root rot caused by Pythium, 31 resistant lines were identified and two main regions were located on chromosomes Pv04 and Pv05. Relevant information for snap bean breeding programs was provided in this work. A total of 20 lines showed resistant or intermediate responses against four or five isolates, which can be suitable for sustainable farm production and could be used as resistance donors. Potential genes and genomic regions to be considered for targeted improvement were provided, including new or less characterized regions that should be validated in future works. Powdery mildew disease was identified as a potential risk for snap bean production and should be considered a main goal in breeding programs