OPTIC FLOW IS THE PATTERN of motion present at the eye of a moving observer. Such flow patterns contain information about self-motion, moving objects, and the threedimensional (3D) layout of the environment, and could potentially be exploited to control locomotion. The term was first used by Gibson (1950) to generalize Helmholtz's notion of motion parallax from single objects to the continuous ...

KENNETH DEWHURST (1919-84) Dr Kenneth E. Dewhurst, TD, DPhil, MD, FRCPsych, the psychiatrist and distinguished historian of medicine, died suddenly on 10 December 1984. He was a Lancastrian by birth and served in the Army throughout the second world war, surviving the evacuation from Europe in 1940 and Far East campaigns. Thereafter, he studied medicine in Dublin and after qualifying in 1952 he...

Bacterial wetwood, bacterial dropsy, or slime is a common disease caused by Lelliottia nimipressuralis, which affects the central core of many conifers and deciduous trees. Representatives this species have been isolated from variety trees showing symptoms disease, as well water and, less commonly, clinical samples. Important aspects pathogenesis process pathogen recognition protection mechanis...

Epidemiological studies have firmly demonstrated that human papillomaviruses (HPVs), are established causes of anogenital cancers (Schiffman,1995, Das et al, 2000, Kirwan & Herrington, 2001). HPV 16 and 18 are the most prevalent types in cervical lesions (Van den Brule et al, 1993). Low risk HPV types 6 and 11, in contrast, are mainly associated with recurrent laryngeal papillomatosis and genit...

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