Abstract: Systems and methods relating to an online system for allowing interactions between online users. The system continuously tracks each user's interactions with different types and categories of content as well as with other users. Based partially on each user's tracked interactions, a probability based model of preferences, interests, and needs is created for each user. The probability based model is then used to predict a user's compatibility with other users and to recommend content. Based on predicted compatibilities, communities and groups of users are recommended to each user. To account for changing user profiles, each user's profile is periodically assessed against the profiles of other users for compatibility. Similarities in interests, preferences, and needs between users, as well as peer rankings, are taken into account when assessing compatibility between users and user groups and communities.

Abstract: The invention relates to a compound of formula (1): wherein P1,P2,P3, and P4 are each independently hydrogen or a protecting group; and n is an integer of from 2 to 20 and to the use of such compounds for the synthesis of 18F—FDG.

Abstract: A process for the production of an 18F-labelled tracer which comprises treatment of a solid support-bound precursor of formula (I): SOLID SUPPORT-LIKER-SO2—O-TRACER (I) with 18F— to produce the labelled tracer of formula (II).