Survival and regrowth of fecal enterococci in desiccated and rewetted sediments

Fecal enterococci are bacteria widely used as indicators of fecal contamination in marine and estuarine waters. One assumption is that these bacteria do not persist or regrow in the environment. Our continuing problems with high numbers of fecal enterococci in sediment suggested that these bacteria may persist and regrow. Therefore, we conducted experiments with fecal enterococci to determine their ability to survive desiccation and to regrow in marine and estuarine sediments from Georgia, New Hampshire, and Puerto Rico after 0, 2, 30, and 60 days. Although numbers of fecal enterococci generally decreased with increased length of drying, many fecal enterococci survived desiccation and regrew in rewetted sediment, violating the assumption that fecal bacteria not persist or regrow in the environment. Because there is not a better alternative to fecal enterococci as fecal indicator bacteria, these results suggest that care should be taken not to disturb the sediment when sampling water for fecal contamination, or if the sediment is already disturbed (e.g., on windy days or during runoff conditions), then the influence of sediment should be considered.Sponsored by: Georgia Environmental Protection Division U.S. Geological Survey, Georgia Water Science Center U.S. Department of Agriculture, Natural Resources Conservation Service Georgia Institute of Technology, Georgia Water Resources Institute The University of Georgia, Water Resources Facult

LOS FOROS EN FÍSICA EN LA FORMACIÓN INICIAL DE LICENCIADOS EN EDUCACIÓNBIOLOGÍA

One of the computer applications used internationally is the interactive platform Moodle for being open source and free distribution. The research presented aims to focus on the problem of rejection by Physics in 1st year students of the Regular Day Course of the Bachelor of Education-Biology career, at the Faculty of Secondary Education of the Central University "Marta Abreu" of Las Villas, Cuba, which is why the forums were used from the virtual learning environment, developed on the Moodle platform in the subject "Physics Topics" during the academic years 2017-2020, in support of the teaching-learning process of the subject in the face-to-face mode. In the research carried out, various theoretical and empirical methods were used. To collect the information, participant observation, analysis of testimonies, discussion and refl ection groups, evaluation records, in-depth interviews, and a diary were used, as well as methods of processing the information collected, both intellectual and statistical. The forums prepared were subjected to evaluation by expert criteria. The information obtained was analyzed following the triangulation process, which showed that the forums had a favorable impact on the students' results in their learning and on the increase in motivation for the subject. The use of forums reveals novel results that provide solutions from different angles, particularly the virtual classroom. Keywords: virtual classroom – virtual learning environments – forum – Moodle interactive platform – PhysicsUna de las aplicaciones informáticas utilizadas internacionalmente es la plataforma interactiva Moodle por ser de código abierto y libre distribución. La investigación que se presenta tiene como objetivo focalizar la problemática del rechazo por la Física en los estudiantes de 1er año del Curso Regular Diurno de la carrera Licenciatura en Educación-Biología, en la Facultad de Educación Media de la Universidad Central “Marta Abreu” de Las Villas, Cuba, razón por la cual se utilizaron los foros desde el entorno virtual de aprendizaje, desarrollado sobre la plataforma Moodle en la asignatura “Temas de Física” durante los cursos académicos 2017-2020, en apoyo al proceso de enseñanza-aprendizaje de la asignatura en la modalidad presencial. En la investigación realizada se utilizaron diversos métodos teóricos y empíricos. Para la recopilación de la información se emplearon la observación participante, análisis de testimonios, grupos de discusión y reflexión, registro de evaluaciones, entrevistas en profundidad y diario, así como métodos de procesamiento de la información recopilada, tanto intelectuales como estadísticos. Los foros elaborados fueron sometidos a la valoración por criterios de expertos. La información obtenida se analizó siguiendo el proceso de triangulación, lo que evidenció que los foros incidieron de manera favorable en los resultados alcanzados por los estudiantes en su aprendizaje y en el aumento de la motivación por la asignatura. La utilización de los foros revela resultados novedosos que aportan soluciones desde diferentes aristas, en particular el aula virtual. Palabras clave: aula virtual – entornos virtuales de aprendizaje – Física – foro – plataforma interactiva Moodl

Synthesis of novel C5-curcuminoid-fatty acid conjugates and mechanistic investigation of their anticancer activity

vi, 105 hal; 15, 5 x 24 c

Memorias IX Congreso Geológico Venezolano (3)

Memorias IX Congreso Geológico Venezolano (3