Washington, April 17 : Scientists at the University of Washington have moved a step closer to developing more effective treatments for jet lag, by finding out that this problem disrupts sleep by upsetting internal clocks in two separate but linked groups of neurons in a structure in the brain called the suprachiasmatic nucleus.

The researchers have revealed that this structure lies below the hypothalamus at the base of the brain.

Washington, April 16 : A minimally invasive surgical approach has been found to have certain advantages that makes it a preferable treatment for some stomach cancer patients.

Washington, April 16 : Cognitive behavioral therapy (CBT) can benefit patients with psychogenic nonepileptic seizures (PNES), according to a new study.

PNES is a condition that is marked by seizures resembling epileptic seizures. However, unlike epilepsy, seizures in patients with PNES are not caused by the same brain cell firing that occurs with epilepsy.

Washington, April 16 : Researchers at Rush University Medical Center are trying to determine whether or not a gel treatment can reduce the size of tumours in patients with oesophageal cancer non-surgically.

The researchers have revealed that the unique drug therapy delivers a highly concentrated dose of chemotherapy injected directly on to the hard-to-reach tumours in the oesophagus.

Oesophageal cancer patients are usually diagnosed at very advanced stages. They have to undergo chemoradiation therapy, and may also have an oesophagectomy, which is a surgical procedure to remove a part of or the entire oesophagus.

Washington, April 16 : Studying HIV-infected people with a particular gene, scientists have gained fresh insights into how the virus mutates and evolves in response to the body's immune pressure.

Dr. Eric Hunter of the Emory Vaccine Center and Oxford University graduate student Hayley Crawford studied people in Zambia and South Africa with one form of the HLA gene that helps the immune system control HIV, called HLA-B*5703.

HLA genes encode molecules that display fragments of viral proteins, known as epitopes, on the surface of infected cells.