The psychologist's role in hostage negotiations.

The purpose of this article is to examine the proper role of the psychologist who serves as a consultant to a hostage negotiation team. Mental health consultants can be beneficial to law enforcement during these times of crisis if they are aware of the appropriate role they play. This article discusses preferred characteristics of a mental health professional serving in this capacity and focuses on the various tasks required of a psychologist on the scene of a barricade.

Two novel mutations in the retinitis pigmentosa GTPase regulator (RPGR) gene in X-linked retinitis pigmentosa (RP3). Mutations in brief no. 172. Online.

Recently a new gene called RPGR (retinitis pigmentosa GTPase regulator) was isolated in Xp21.1 and found to be mutated in patients with RP3 type X-linked retinitis pigmentosa. Two new mutations, the first a single base pair deletion and the other a two base pairs deletion, have been found in one Spanish and one Italian family.

Autosomal-dominant retinitis pigmentosa associated with an Arg-135-Trp point mutation of the rhodopsin gene. Clinical features and longitudinal observations.

Purpose: To report the clinical and functional characteristics of patients affected with autosomal-dominant transmitted retinitis pigmentosa (adRP) from a large Italian pedigree in which a point mutation predicting the Arg-135-Trp change of rhodopsin was identified by polymerase chain reaction-single-strand conformation polymorphism analysis.

Methods: Seven patients, ranging in age from 6 to 41 years, underwent a full clinical ophthalmologic evaluation, kinetic visual field testing, and electroretinographic testing.

Results: In agreement with previous reports, this rhodopsin mutation yielded a particularly severe phenotype, both clinically and functionally.