Vāmiq va ʽAḏrā. Éd. R. Anzābī-Nažād et Ġ. Ṭabāṭabā’ī Majd. Tehrān, Markaz-i Našr-i Dānišgāhī, 1381/2002, 155 p.

A S  P I R

Alice wants to query a database but she does not want the database to learn what she is querying. She can ask for the entire database. Can she get her query answered with less communication? One model of this problem is Private Information Retrieval, henceforth PIR. We survey results obtained about the PIR model including partial answers to the following questions. (1) What if there are k non-c...

4 @bullet S C I E N C E & P R a C T I C E P E R S P E C T I V E S — a P R I L 2 0 0 7

Modern imaging techniques enable researchers to observe drug actions and consequences as they occur and persist in the brains of abusing and addicted individuals. This article presents the five most commonly used techniques, explains how each produces images, and describes how researchers interpret them. The authors give examples of key findings illustrating how each technique has extended and ...

A R T E R I a L H Y P E R T E N S I O N I N Rats I. Methods

The blood pressure of anesthetized rats has been measured in the course of several experiments. Attempts were made to produce arterial hypertension x by a number of methods. These investigations were undertaken in order: (1) to learn what the normal blood pressure of rats is under anesthesia, (2) to develop methods to bring about arterial hypertension, (3) to study some of the pathological chan...

56 S C I E N T I F I C a M E R I C a N a P R I L 2 0 0 6

REPRÉSENTATIONS p-ADIQUES ET NORMES UNIVERSELLES I. LE CAS CRISTALLIN

Soit p un nombre premier impair, K = Qp et soient Kn = Qp(μpn) le corps des racines p-ièmes de l’unité dans une clôture algébriqueQp de Qp, K∞ la réunion des Kn et G∞ = Gal(K∞/K). Soit une courbe elliptique E définie sur Qp. Si E(Kn) est le groupe des points de E définis sur Kn, la limite projective des E(Kn) pour les applications de trace a d’abord été étudiée lorsque E a bonne réduction ordin...