Una lectura crítica del psicoanalis frances de grupos en relacion a la obra de René Kaës

Este trabajo busca plantear algunas observaciones expositivas y críticas en relación a la obra de René Kaës, tratando de mostrar la importancia de sus desarrollos teóricos y clínicos. Se harán algunas comparaciones entres sus ideas de 1977 y las que comienza a desarrollar a partir de 1985. Se hará especial énfasis en los conceptos de narcisismo primario y secundario, isomorfia y homomorfia y el estudio del pacto denegativo y las tres modalidades de lo negativo

Reversible Modulation of Elasticity in Fluoroazobenzene-Containing Hydrogels Using Green and Blue Light

Hydrogels are soft materials that have found multiple applications in biomedicine and represent a good platform for the introduction of molecular switches and synthetic machines into macromolecular networks. Tuning their mechanical properties reversibly with light is appealing for a variety of advanced applications and has been demonstrated in the past; however, their activation typically requires the use of UV light, which displays several drawbacks related to its damaging character and limited penetration in tissues and materials. This study circumvents this limitation by introducing all-visible ortho-fluoroazobenzene switches into a hydrophilic network, which, as a result, can be activated with green or blue light. Photoisomerization of the photochromic moieties is accompanied by a reversible tuning of the elastic modulus. The translation of molecular isomerization within the network into macroscopic modulation of its mechanical properties is attributed to different aggregation tendencies of the E and Z isomers of the azobenzene derivatives