The results obtained show that ionizing radiation caused redistribution of the main junctional proteins E-cadherin, occludin and ZO-1 with minor changes for claudin-1, leading to disassembly of the junctional complex and loss of its functionality in Caco-2 cells. The molecular mechanisms responsible for these events need further elucidation.

This study aimed to characterize the behavior of the Paraty shoreline, in the south of the state of Rio de Janeiro, and identify the areas which are most susceptible to erosion and flooding. This region is characterized by a presence the Serra do Mar, marked by a succession of small embayments and narrow coastal plains. The methodology consisted of using a UAV (Unmanned Aerial Vehicle) for the production of orthoimage mosaics (2019) and digital surface models (DSM); shoreline mapping between 2005 and 2019; identification of areas susceptible to erosion and flooding; and flood simulation performed on the Simulate Water Level Rise/Flooding package, from Global Mapper software. The results show that the southern sector of Jabaquara Beach, the beaches of Pontal and Terra Nova (in the center of Paraty -Centro) in the sheltered portion of the coast of Paraty, in addition to Cepilho and Fora (in Trindade), showed erosive behavior over the 14 years analyzed. Ranchos Beach (Trindade) and the northern sector of Jabaquara showed stable behavior and the central sector of Jabaquara showed an accretion during the same period. The coast of Jabaquara, the central area of Paraty, and the southwest sector of Trindade were considered the most vulnerable to flooding due to their susceptibility and the high concentration of the urban and tourist infrastructure of the municipality, where the problems caused by erosion and flooding have been frequently reported by residents and visitors.

ha reportado un proceso acentuado de erosión en algunas playas arenosas, sin que se haya podido distinguir entre erosión propiamente y la dinámica de la playa que responde al clima de oleaje. Este estudio tuvo como objetivo caracterizar la dinámica morfológica y sedimentaria de la playa Cieneguita, ubicada en Limón. Se realizaron perfiles de playa y análisis granulométricos de la arena, en cuatro puntos, para caracterizar su comportamiento estacional y las características de los sedimentos. Al analizar los perfiles de playa en su conjunto se reconoce una dinámica en el backshore que comprende un largo promedio de 40 m, donde la playa es destruida y reconstruida en ciclos anuales acorde con las condiciones del clima marino. Los sedimentos de las playas son predominantemente representados por arena muy fina a lo largo de toda su longitud. Los resultados obtenidos mostraron que la playa de Cieneguita responde rápidamente a los cambios en las condiciones del mar, estrechándose durante el inverno hemisférico y recuperándose paulatinamente a lo largo del año hasta alcanzar su mayor extensión durante el otoño o el verano. Durante las tormentas más severas, las estructuras urbanas cercanas a la playa han resultado dañadas o incluso destruidas.