An iliac-appendiceal fistula causing gastrointestinal bleeding

© 2019 The Authors Aortoenteric fistulas are an uncommon cause of gastrointestinal bleeding, and iliac-appendiceal fistulas are an even rarer cause. We describe a case of an iliac-appendiceal fistula in a patient who presented several months after aortic reconstruction with gastrointestinal bleeding. An extensive workup revealed that the source of bleeding was localized to the appendiceal orifice. The patient underwent an appendectomy with a two-stage procedure involving the iliac graft for definitive repair and ultimately recovered well. Despite the rarity of aortoenteric and iliac-appendiceal fistulas causing gastrointestinal bleeding, keeping a high index of suspicion in patients with a prior vascular repair can prevent death

CHARACTERIZATION OF SEMICONDUCTOR ELECTROLYTE INTERFACE BY MODULATED PHOTOLUMINESCENCE

Nous montrons que la photoluminescence, modulée par de faibles variations du potentiel des électrodes, est un outil puissant pour contrôler la distribution du potentiel à l'interface semiconducteur-électrolyte. Nous présentons des résultats sur des couches minces et des monocristaux de CdSe dans des cellules photovoltaiques électrochimiques.We will show that photoluminescence, modulated by small periodic changes of electrode potential serves as a powerful tool for monitoring the potential distribution at the semiconductor electrolyte interface. Results will be presented for thin film and single crystal CdSe in electrochemical photovoltaic cells