Though Pollard and Sag 1994] assumes that an unspeciied variant of the formal logic of Carpenter 1992] will provide a formalism for HPSG, a precise formulation of the envisaged formalism is not immediately obvious, primarily because a principal tenet of Carpenter 1992], that feature structures represent partial information, seems to connict with a principal tenet of Pollard and Sag 1994], that ...

The worldwide quest for an AIDS vaccine represents an unprecedented scientific and human challenge for the 21st century. Preventive vaccines represent our only long-term hope to stop the epidemic. AIDS vaccines must be seen as the ultimate prevention tool that will complement the existing prevention strategies in place. The acceleration of vaccine development through the parallel exploration of...

The star of last month's Chelsea Flower Show, also featuring in many other international events, was one of the world's rarest and most prehistoric trees, now the subject of innovative conservation strategies in its native Australia. Hannah Robertson reports. In a secret location deep within Wollemi National Park, 200 km northwest of Sydney, lives perhaps the most intriguing tree in the world: ...

Alzheimer’s Disease (AD), the leading cause of dementia worldwide, is an irreversible progressive neurodegenerative disorder characterized by cognitive impairment and functional disability . Devastating nature of AD leads to serious social and economic impacts on the healthcare systems which implies the necessity of its proper management. It has been demonstrated that patients’ quality of life ...