Impact of Physical/Chemical Properties of Volcanic Ash-Derived Soils on Mechanisms Involved during Sorption of Ionisable and Non-Ionisable Herbicides

Volcanic ash-derived soils (VADSs) are of great importance in the agricultural economy of several emerging and developing countries. The surface-charge amphoteric characteristics will confer physical/chemical properties absolutely different to constant-charge soils. This surface reactivity will confer to them a particular behaviour in relation to the herbicide sorption, representing an environmental substrate that may become polluted over time due to intensive agronomic uses. Sorption is a key parameter to evaluate the fate and behaviour of herbicides in volcanic soils. Sorption type and kinetic sorption models are also necessary in order to develop and validate QSAR models to predict pesticide sorption on volcanic soils to prevent potential contamination of water resources. The use of solute sorption mechanism models and QSAR models for pesticide sorption in soils has contributed to a better understanding of the behaviour of pesticides on volcanic soils. This chapter is divided into five sections: Physical/chemical properties of volcanic ash-derived soils; Ionisable and non-ionisable herbicides’ fate and behaviour in soil; Kinetic sorption: mechanisms involved during sorption of ionisable and non-ionisable herbicides on VADS; Sorption of ionisable and non-ionisable herbicides on VADS; and Physical/chemical properties in QSAR models: a mechanistic interpretation

Novel Educational Computational Chemistry Learning Environments Effect on Preservice Chemistry Teachers' Perceptions of Technological Pedagogical Content Knowledge

Peer reviewe

Developing technological pedagogical science knowledge through educational computational chemistry: a case study of pre-service chemistry teachers’ perceptions

The purpose of this descriptive case study was to develop pre-service chemistry teachers’ Technological Pedagogical Science Knowledge (TPASK) through novel computational chemistry modules. The study consisted of two phases starting with designing a computational chemistry based learning environment followed by a case study where students’ perceptions towards educational computational chemistry were explored. First, we designed an authentic research-based chemistry learning module that supported problem-based learning through the utilization of computational chemistry methods suitable for pre-service chemistry education. The objective of the learning module was to promote learning of specific chemistry knowledge and development of scientific skills. Systematic design decisions were made through the TPASK framework. The learning module was designed for a third-year physical chemistry course taken by pre-service chemistry teachers in Chile. After the design phase, the learning module was implemented in a course and students’ perceptions were gathered using semi-structured group interviews. The sample consisted of 22 pre-service chemistry teachers. Data were analyzed through qualitative content analysis using the same TPASK framework employed in the learning module design. Based on our findings, pre-service chemistry teachers first acquired Technological Scientific Knowledge (TSK) and then developed some elements of their TPASK. In addition, they highly appreciated the combination of student-centred problem-based learning and the use of computational chemistry tools. Students felt the educational computational learning environment supported their own knowledge acquisition and expressed an interest in applying similar learning environments in their future teaching careers. This case study demonstrates that learning through authentic real-world problems using educational computational methods offers great potential in supporting pre-service teachers’ instruction in the science of chemistry and pedagogy. For further research in the TPASK framework, we propose there would be significant benefit from developing additional learning environments of this nature and evaluating their utility in pre-service and in-service chemistry teacher’s education.Peer reviewe

Criterios de implementación ISO 14000:2015 Caso Estudio Sector Avícola Granja Agrícola el Jordán Paipa Boyacá.

La producción avícola en Colombia ocupa un gran espacio en el sector, ya que los huevos son una fuente vital de alimento para las personas y es una proteína económica, por lo que su producción es una fuente importante para la economía del país y la generación de empleo. Avícola el Jordán es una granja que tiene una historia de más de 20 años en el sector avicola,está ubicada en la zona rural de Paipa Boyacá, Esmeralda. El proceso comienza desde la cría de gallinas hasta su descarte. Con el siguiente estudio queremos diagnosticar la situación ambiental de las aves de corral, así como la verificación de cómo se aplica el Plan de Gestión Ambiental de acuerdo con ISO 14001: 2015 y el cumplimiento de los requisitos, una visita física a las instalaciones avícolas de la granja finca de El Granja Jordán que, a través del registro fotográfico, completa una lista de verificación, una matriz de aspectos e impactos ambientales y la implementación del ciclo PHVA nos permitirá mantener la mejora continua de los procesos productivos de la finca, además de estos Las herramientas lo ayudan a identificar y proporcionar soluciones a los diferentes problemas encontrados en la granja avícola.Poultry production in Colombia occupies a large space in the sector, since eggs are a vital source of food for people and is an economic protein, so their production is an important source for the country's economy and the generation of job. Avícola el Jordán is a farm that has a history of more than 20 years in the poultry sector, is located in the rural area of ​​Paipa Boyacá, Esmeralda. The process starts from chicken farming to disposal. With the following study we want to diagnose the environmental situation of poultry, as well as the verification of how the Environmental Management Plan is applied in accordance with ISO 14001: 2015 and compliance with the requirements, a physical visit to the poultry facilities of The farm farm of El Granja Jordán that, through the photographic record, completes a checklist, a matrix of environmental aspects and impacts and the implementation of the PHVA cycle will allow us to maintain the continuous improvement of the productive processes of the farm, in addition to These tools help you identify and provide solutions to the different problems found in the poultry farm

Zentyal server 6.2 servidor de administración de servicios de red en gnu/linux

Imagen 1. Instalación Zentyal 6.2. Ilustración propia,Imagen 2. Selección nombre de máquina. Ilustración propia,Imagen 3. Progreso Instalación. Ilustración propia,Imagen 4. Finalización Instalación. Ilustración propia,Imagen 5. Ventana escritorio Zentyal 6.2. Ilustración propia,Imagen 6. Acceso Zentyal 6.2. Ilustración propia,Imagen 7. Gestión de Software. Ilustración propia,Imagen 8. Selección de paquetes. Ilustración propia,Imagen 9. Paquetes instalados. Ilustración propia,Imagen 10. Panel de control DNS. Ilustración propia,Imagen 11. Configuración DNS. Ilustración propia,Imagen 12. Panel de control DHCP. Ilustración propiaImagen 13. Configuración módulo. Ilustración propia,Imagen 14. Componentes, ilustración propia.,Imagen 15. Instalación paquetes, ilustración propia.,Imagen 16. Configuración general proxy, ilustración propia.,Imagen 17. Interfaces de red, ilustración propia,Imagen 18. Configuración de red, ilustración propia,Imagen 19. Crear objeto, ilustración propia,Imagen 20. Agregar usuarios, ilustración propia,Imagen 21. Miembros - Agregar usuarios, ilustración propia,Imagen 22. Añadir nuevo, ilustración propia,Imagen 23. Ingreso datos, ilustración propia,Imagen 24. Pantalla principal objetos, ilustración propia,Imagen 25. Configuración general, ilustración propia,Imagen 26. Reglas de acceso, ilustración propia,Imagen 27. Ingreso objeto creado, ilustración propia,Imagen 28. Evidencia de cambios, ilustración propia,Imagen 29.Configuración proxy navegador, ilustración propia,Imagen 30. Rechazo conexiones, ilustración propia,Imagen 31. Selección de módulos, ilustración propia,Imagen 32. Configuración de interfaces, ilustración propia,Imagen 33. Dashboard, ilustración propia.,Imagen 34. Configuración de direccionamiento DHCP. Ilustración propia,Imagen 35. Asignación de IP por DHCP. Ilustración propia,Imagen 36. Ejecución de comando ifconfig Ubuntu,Imagen 37. Acceso a panel de administración Zentyal desde Ubuntu. Ilustración propia.,Imagen 38. IP. Ilustración propia.,Imagen 39. Panel de filtrados. Ilustración propia.,Imagen 40. Panel de administración de reglas de filtrados cortafuegos. Ilustración propia.,Imagen 41. Creación de regla de bloqueo Facebook e Instagram. Ilustración propia.,Imagen 42. Reglas de filtrado creadas, panel cortafuegos. Ilustración propia,Imagen 43. Navegación a Facebook bloqueada, Ilustración Propia.,Imagen 44. Navegación Instagram, bloqueada. Ilustración propia.,Imagen 45. Creación de usuario, Ilustración Propia,Imagen 46. Configuración LDAP Ilustración propia.,Imagen 47. Configuración Dominio Ilustración propia.,Imagen 48. Configuración Rangos Ilustración propia.,Imagen 49. Configuración red máquina virtual Ilustración propia.,Imagen 50. Creación de carpeta Ilustración propia,Imagen 51. Modulo ficheros Ilustración propia.Imagen 52. Control de acceso Ilustración propia.,Imagen 53. Verificación de acceso Ilustración propia.,Imagen 54. Creación certificado Ilustración propia,Imagen 55. Creación VPN Ilustración propia,Imagen 56. Creación nuevo certificado Ilustración propia,Imagen 57. Verificación estado. Ilustración propia,Imagen 58. Configuración VPN. Ilustración propia.,Imagen 59. Creación servicio Ilustración propia,Imagen 60. Configuración servidor VPN .Ilustración propia,Imagen 61. conexión cliente Ilustración propia,Imagen 62. Configuración conexión. Ilustración propia,Imagen 63. Descarga cliente Ilustración propia,Imagen 64. Conexión cliente con servidor VPN Ilustración propia,Imagen 65. Conexión establecida con servidor VPN. Ilustración propia,Imagen 66. No conexión Ilustración propia,Imagen 67. Acceso por navegador Ilustración propia,Imagen 68. Prueba conexión Ilustración. propia,Imagen 69. Conexión establecida. Ilustración propiaEl objetivo de este trabajo fue formular soluciones bajo GNU/Linux que permita dar respuesta a los requerimientos específicos del cliente. Usando como sistema operativo Zentyal Server 6.2 con el que se implementaran los servicios y plataformas tales como, Controlador de Dominio, DHCP Server, DNS Server, Proxy, Cortafuegos, File Server y Print Server, VPN.The objective of this work was to formulate solutions under GNU / Linux that allow to respond to the specific requirements of the client. Using Zentyal Server 6.2 as the operating system with which services and platforms such as Domain Controller, DHCP Server, DNS Server, Proxy, Firewall, File Server and Print Server, VPN will be implemente

Increased Na+ /Ca2+ exchanger expression/activity constitutes a point of inflection in the progression to heart failure of hypertensive rats

Spontaneously hypertensive rat (SHR) constitutes a genetic model widely used to study the natural evolution of hypertensive heart disease. Ca2+ -handling alterations are known to occur in SHR. However, the putative modifications of Ca2+ -handling proteins during the progression to heart failure (HF) are not well established. Moreover, the role of apoptosis in SHR is controversial. We investigated intracellular Ca2+ , Ca2+ -handling proteins and apoptosis in SHR vs. control Wistar rats (W) from 3 to 15 months (mo). Changes associated with the transition to HF (i.e. lung edema and decrease in midwall fractional shortening), occurred at 15 mo in 38% of SHR (SHRF). In SHRF, twitch and caffeine-induced Ca2+ transients, significantly decreased relative to 6/9 mo and 15 mo without HF signs. This decrease occurred in association with a decrease in the time constant of caffeine-Ca2+ transient decay and an increase in Na+ /Ca2+ exchanger (NCX) abundance (p, 0.05) with no changes in SERCA2a expression/activity. An increased Ca2+ -calmodulin-kinase II activity, associated with an enhancement of apoptosis (TUNEL and Bax/Bcl2) was observed in SHR relative to W from 3 to 15 mo. Conclusions: 1. Apoptosis is an early and persistent event that may contribute to hypertrophic remodeling but would not participate in the contractile impairment of SHRF. 2. The increase in NCX expression/activity, associated with an increase in Ca2+ efflux from the cell, constitutes a primary alteration of Ca2+ -handling proteins in the evolution to HF. 3. No changes in SERCA2a expression/activity are observed when HF signs become evident.Fil: Rodriguez, Jesica S.. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; ArgentinaFil: Velez Rueda, Jorge Omar. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; ArgentinaFil: Salas, Margarita. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; ArgentinaFil: Becerra, Romina Valeria. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; ArgentinaFil: Di Carlo, Mariano Nahuel. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; ArgentinaFil: Said, Maria Matilde. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; ArgentinaFil: Vittone, Leticia Beatriz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; ArgentinaFil: Rinaldi, Gustavo Juan. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; ArgentinaFil: Portiansky, Enrique Leo. Universidad Nacional de la Plata. Facultad de Ciencias Veterinarias; ArgentinaFil: Mundiña, Cecilia Beatriz. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; ArgentinaFil: Palomeque, Julieta. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; ArgentinaFil: Mattiazzi, Ramona Alicia. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnológico la Plata. Centro de Investigaciones Cardiovasculares "dr. Horacio Eugenio Cingolani"; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Médicas; Argentin

Increased Na+/Ca2+ exchanger expression/activity constitutes a point of inflection in the progression to heart failure of hypertensive rats

Spontaneously hypertensive rat (SHR) constitutes a genetic model widely used to study the natural evolution of hypertensive heart disease. Ca 2+-handling alterations are known to occur in SHR. However, the putative modifications of Ca2+-handling proteins during the progression to heart failure (HF) are not well established. Moreover, the role of apoptosis in SHR is controversial. We investigated intracellular Ca 2+, Ca2+-handling proteins and apoptosis in SHR vs. control Wistar rats (W) from 3 to 15 months (mo). Changes associated with the transition to HF (i.e. lung edema and decrease in midwall fractional shortening), occurred at 15 mo in 38% of SHR (SHRF). In SHRF, twitch and caffeine-induced Ca2+ transients, significantly decreased relative to 6/9 mo and 15 mo without HF signs. This decrease occurred in association with a decrease in the time constant of caffeine-Ca2+ transient decay and an increase in Na+/Ca2+ exchanger (NCX) abundance (p< 0.05) with no changes in SERCA2a expression/activity. An increased Ca 2+-calmodulin-kinase II activity, associated with an enhancement of apoptosis (TUNEL and Bax/Bcl2) was observed in SHR relative to W from 3 to 15 mo. Conclusions: 1. Apoptosis is an early and persistent event that may contribute to hypertrophic remodeling but would not participate in the contractile impairment of SHRF. 2. The increase in NCX expression/activity, associated with an increase in Ca2+ efflux from the cell, constitutes a primary alteration of Ca2+-handling proteins in the evolution to HF. 3. No changes in SERCA2a expression/activity are observed when HF signs become evident.Centro de Investigaciones CardiovascularesFacultad de Ciencias Veterinaria

Increased Na+/Ca2+ exchanger expression/activity constitutes a point of inflection in the progression to heart failure of hypertensive rats

Spontaneously hypertensive rat (SHR) constitutes a genetic model widely used to study the natural evolution of hypertensive heart disease. Ca 2+-handling alterations are known to occur in SHR. However, the putative modifications of Ca2+-handling proteins during the progression to heart failure (HF) are not well established. Moreover, the role of apoptosis in SHR is controversial. We investigated intracellular Ca 2+, Ca2+-handling proteins and apoptosis in SHR vs. control Wistar rats (W) from 3 to 15 months (mo). Changes associated with the transition to HF (i.e. lung edema and decrease in midwall fractional shortening), occurred at 15 mo in 38% of SHR (SHRF). In SHRF, twitch and caffeine-induced Ca2+ transients, significantly decreased relative to 6/9 mo and 15 mo without HF signs. This decrease occurred in association with a decrease in the time constant of caffeine-Ca2+ transient decay and an increase in Na+/Ca2+ exchanger (NCX) abundance (p< 0.05) with no changes in SERCA2a expression/activity. An increased Ca 2+-calmodulin-kinase II activity, associated with an enhancement of apoptosis (TUNEL and Bax/Bcl2) was observed in SHR relative to W from 3 to 15 mo. Conclusions: 1. Apoptosis is an early and persistent event that may contribute to hypertrophic remodeling but would not participate in the contractile impairment of SHRF. 2. The increase in NCX expression/activity, associated with an increase in Ca2+ efflux from the cell, constitutes a primary alteration of Ca2+-handling proteins in the evolution to HF. 3. No changes in SERCA2a expression/activity are observed when HF signs become evident.Centro de Investigaciones CardiovascularesFacultad de Ciencias Veterinaria

High-throughput phenotyping and improvements in breeding cassava for increased carotenoids in the roots

Past research developed reliable equations to base selections for high β-carotene on near-infrared spectroscopy (NIR) predictions (100 genotypes d−1) rather than with high-performance liquid chromatography (HPLC) (<10 samples d−1). During recent harvest, CIAT made selections based on NIR predictions for the first time. This innovation produced valuable information that will help other cassava (Manihot esculenta Crantz) breeding programs. A total of 284 samples were analyzed with NIR and HPLC for total β-carotene (TBC) and by the oven method for dry matter content (DMC). Results indicated that NIR reliably predicted TBC and DMC. In addition, 232 genotypes grown in preliminary yield trials (PYTs) were harvested at 8.5 and 10.5 mo after planting (one plant per genotype and age) and root quality traits analyzed (by NIR only). Repeatability of results at the two ages was excellent, suggesting reliable results from NIR. In contrast to previous reports, age of the plant did not influence carotenoids content in the roots. The availability of a high-throughput NIR protocol allowed comparing results (for the first time) from seedling and cloned plants from the same genotype. Results showed very little relationship for DMC between seedling and cloned plants (R2 = 0.09). There was a much better association for TBC (R2 = 0.48) between seedling and cloned plants. It is postulated that variation in the environmental conditions when seedling and cloned plants (from the same genotype) may be responsible for these weak associations. Important changes in selection strategies have been implemented to overcome problems related to a lengthy harvesting season. (Résumé d'auteur