A recent study has shown that respiratory structures are disproportionately oversized in larger insects, and that oxygen supply to leg muscles may be physically constrained in the largest modern insects. High oxygen concentrations during the Carboniferous may have alleviated these physical constraints allowing the evolution of gigantic arthropods.

"Intraprofessional Team BUilding" in the September 1987 issue (pp. 576582) was a pertinent and stimulating article ro me. Our Psychosocial Occupational Therapy Department at Christ Hospital and Medical Center consists of seven occu pational therapists (OTRs) and nine occupational therapy assistants (COTAs) who work together on occupational therapy teams. A typical team includes one therapist as...

The cortical column has been an invaluable concept to explain the functional organization of the neocortex. While this idea was born out of experiments that cleverly combined electrophysiological recordings with anatomy, no one has 'seen' the anatomy of a column. All we know is that when we record through the cortex of primates, ungulates, and carnivores in a trajectory perpendicular to its sur...

• The prevalence of different types of glaucoma in the population (as open-angle and angle-closure glaucoma are managed differently). • The age and socio-economic status of the local population, as well as any biomedical/metabolic or genetic factors that might predispose them to glaucoma. This makes it possible to identify the high-risk groups. • The local community’s knowledge, beliefs and hea...