\Nonlinear Schrr odinger Equations, Wavelength Divison Multiplexing and Four Wave Mixing" In the limit of large frequency spacing the multisoliton solutions of the nonlinear Schrr odinger equation (NLS), which models the evolution of nonlinear waves in optical bers, are investigated. In Fourier space the individual pulses are found to always be widely separated, and hence can be easily, measure...

Climate change will shortly be assuming centre stage when Copenhagen hosts the United Nations Climate Change Conference in early December 2009. In Copenhagen, delegates will discuss the international response to climate change (i.e. the ongoing increase in the Earth's average surface temperature) and the meeting is widely viewed as the most important of its kind ever held (http://en.cop15.dk/)....

Critique and Praxis can be read as a remarkable intellectual history of critical theory in the broadest sense, which demonstrates highly sophisticated, original understanding its concepts methods, historical, social political contexts, well unquestioned assumptions limitations. Harcourt’s scholarship depth thought are impressive. But & is much more than that. It genuine intervention within, maj...

Thinking about the future of the RBO automatically leads to reflection on the future of our specialty, since it is certain that the RBO will be responsible for publicizing this future. Taking a light but critical tone, I reflected on the progress of orthopedics over the last few years, by asking: In what way have we evolved? Is there much to be done? Recently, we commemorated the hundredth anni...

The Medicare program is on the verge of major change. The proof of the value of reforms will not rest in how well the program meets the needs of the healthy and wealthy, but rather in whether they preserve or improve upon protections for those who would not be well served by an unregulated private sector--persons with low incomes and/or substantial health problems. This paper examines four key ...

There are many unanswered questions about how to manage secondary hyperparathyroidism and associated alterations in mineral metabolism in patients with end-stage renal disease. We provide commentary on an observational study by Komaba et al. that presents interesting new insights into the long-standing controversy related to the impact of parathyroidectomy on survival of hemodialysis patients.

Borrelia burgdorferi can very quickly move from the site of a tick bite into the circulatory system, where it can circulate throughout the body. This unique bacterium has a distinct and insidious method for passing through the capillary walls of blood vessels and nestling its way deep inside many organs and tissues of the human body. In animal models, the Lyme spirochete within mere hours of a ...

A consideration of the role of neuroimaging in clinical practice falls in the realm of discussions of personalized medicine. In reference to clinical psychiatry, personalized medicine can be simply conceptualized as falling into 3 domains: the study of genetic variation (including pharmacogenetics), the measurement of various molecular or biochemical indices of disease states (possibly includin...