Increased levels of physical exercise have been related to improvements in cognitive functioning and mood in patients with depression. The evidence for sedentary lifestyle and low levels of physical activity in early adulthood being associated with subsequent depressive symptoms is more mixed. Åberg and colleagues (pp. 352–359) examined depressive illness in a large cohort of prospectively asse...

aim : this study evaluated the results and efficacy of serum ca 19-9 in determining the nature of a pancreatic solid mass in patients referred for investigation of possible malignancy. background : a wide variety of tumor markers have been proposed for pancreatic cancer but currently the only one with any practical usefulness for diagnosis, prognosis, and monitoring of treatment is “ca 19-9 ”. ...

this paper is a concise field report of tafresh earthquake of december 19, 1980 which shook the cities of saveh, qom, arak and nearby villages. observations from the earthquake effects on the buildings and the causes of their failures are discussed briefly.

Tradi tional distributed computing is dominated by a client–server model. File systems, databases, and hypertext systems are all designed with the assumption that a few powerful and reliable servers support a large and dynamic set of clients. Servers are complex and expensive, while clients are lightweight, cheap, and simple. Servers are responsible for persistence, security, and coherence, whi...

where we can collapse values of x to the range 0 ≤ x ≤ 1, is sufficiently simple that much is known rigorously [1], yet displays the interplay between frequency locking and the onset of chaos from quasiperiodic motion. There are also a number of excellent reviews e.g. references [2] and [3]. The map is monotonic and invertible for K < 1, but develops an inflection point at x = 0 for K = 1 and t...

Understanding sexual behaviour change in response to HIV/AIDS has been an enduring puzzle for those working to stop the pandemic. Gay communities in the developed world have rapidly achieved a remarkable level of behaviour change in facing the epidemics they have weathered. What might we learn from the example of the Australian gay communities that might be useful for other communities and popu...