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WASHINGTON, May 2 (Xinhua) -- Eating foods that contain omega-3 fatty acids, such as fish, salad dressing and nuts may be associated with lower blood levels of a protein related to Alzheimer's disease and memory problems, according to a new study published Wednesday in online issue of Neurology, the medical journal of the American Academy of Neurology.

In the first quarter, China's imports and exports expanded 7.3 percent from a year ago to reach 859.37 billion U.S. dollars, marking the slowest pace since the fourth quarter of 2009 and showing a growth rate that was 22.3 percentage points lower than that in 2011.

The six world powers tabled a package of incentives to Iran in a bid to settle the disputes over its nuclear program, while Iran also announced its readiness for further discussions of the problem of 20-percent enrichment of uranium, according to Liu.

"The evidence is clear that getting enough sleep is important for health, and that sleep should be at night for best effect," said Buxton.

According to Han, the agricultural ministries of both countries will push forward cooperation in the areas of food security, sustainable development, agricultural trade and science and technology, creating opportunities for cooperation between agricultural enterprises of the two countries and promoting joint research on agriculture.