Surface analysis in microelectronics.

The contribution given by surface analysis to solve some problems encountered in the production of electronic power devices have been discussed. Mainly two types of problems have been faced. One of these deal with interfacial chemistry. Three examples have been investigated. The first applies to the improvement of the quality and the reliability of plastic packages through the optimization of the resin/metal and resin/die adhesion. The second relies to the adhesion between polyimide and silicon nitride used in the multilevel technology. The third example refers to the so called die-attach process and related problems. Another area of interest in microelectronics is that of the erosion of various types of surfaces and the possibility of wrong etching. A few examples of the application of surface analytical techniques for these problems will be presented. XPS and SIMS working in imaging and multipoint analysis mode, scanning acoustic microscopy, contact angle measurements as well as peeling and tensile strength measurements are the main tools used to obtain useful data.

[Adenoacanthoma of the upper esophagus. Report of a case]. / Adenoacantoma del esófago superior. Presentación de un caso.

We report a 72 year-old woman, with adenoacanthoma of the upper esophagus who was admitted in Hospital Israelita "EZRAH" in April of 1991. We performed a review of the literature on this rare tumour, that is the reason of presenting this case.

Adenoacantoma del esófago superior. Presentación de un caso. / [Adenoacanthoma of the upper esophagus. Report of a case]

We report a 72 year-old woman, with adenoacanthoma of the upper esophagus who was admitted in Hospital Israelita [quot ]EZRAH[quot ] in April of 1991. We performed a review of the literature on this rare tumour, that is the reason of presenting this case.

Adenoacantoma del esófago superior. Presentación de un caso. / [Adenoacanthoma of the upper esophagus. Report of a case]

We report a 72 year-old woman, with adenoacanthoma of the upper esophagus who was admitted in Hospital Israelita [quot ]EZRAH[quot ] in April of 1991. We performed a review of the literature on this rare tumour, that is the reason of presenting this case.

Esofago de Barrett / Barretts esophagus

Se realiza una revisión bibliográfica acerca del estado actual de los conceptos del esófago de Barrett. Se describe la definición, los mecanismos etiopatogénicos y fisiopatológicos, su cuadro clínico, la metodología diagnóstica, sus asociaciones morbosas con esclerodermia, síndrome de Zollinger-Ellison, adenocarcinoma y acalasia. Se revisan además los corceptos actuales sobre su terapéutica médico-quirúrgica (AU)

Esofago de Barrett / Barrett's esophagus

Se realiza una revisión bibliográfica acerca del estado actual de los conceptos del esófago de Barrett. Se describe la definición, los mecanismos etiopatogénicos y fisiopatológicos, su cuadro clínico, la metodología diagnóstica, sus asociaciones morbosas con esclerodermia, síndrome de Zollinger-Ellison, adenocarcinoma y acalasia. Se revisan además los corceptos actuales sobre su terapéutica médico-quirúrgica

Preparation and ESCA characterization of poly(vinyl chloride) surface-grafted with heparin-complexing poly(amido amine) chains.

By a simple process poly(amido-amine) chains have been grafted on the surface of poly(vinyl chloride). Grafted poly(vinyl chloride) is able to adsorb heparin, thus providing potentially non-thrombogenic surfaces. The grafting of poly(amido-amine), and the heparin adsorption have been studied by ESCA. It has been found that the total amount of grafted poly(amido-amine) depends on the molecular weight of the poly(amido-amine) used in the grafting reaction, but the amount of heparin adsorbed on the grafted material is relatively independent of the length of the poly(amino-amine) grafted chains.