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Science News for June 8, 2007


Calorie density key to losing weight

A year-long clinical trial shows that diets focusing on foods with low calorie density can lead to significant weight loss and improved hunger control. The study found that women who added water-rich foods to their diets lost more weight during the first six months compared to those following a reduced-fat diet.

Solving sudokus -- Coloring by numbers

Researchers use graph theory to analyze Sudoku puzzles, finding that at least 8 of the 9 numbers must appear as given entries for a puzzle to have only one solution. They also explore unsolved problems in graph theory and argue that the number of distinct Sudoku puzzles is around 5.5 billion.

SourceAmerican Mathematical Society·JournalNotices of the American Mathematical Society·DateJun 8, 2007

A wider range of sounds for the deaf

Researchers have successfully implanted a tiny electrode array in the auditory nerve of cats, enabling them to hear a wide range of sounds. The device has several advantages over cochlear implants, including more precise activation of specific frequency signals and reduced electrical current requirements.

SourceMichigan Medicine - University of Michigan·JournalJournal of the Association for Research in Otolaryngology·DateJun 8, 2007

Now playing -- Cell migration LIVE!

Researchers have successfully observed cell migration in real-time using a specialized liquid culture medium, shedding light on the nuances of organized cell movement. This breakthrough could lead to strategies for regulating both normal growth and cancer progression.

SourceJohns Hopkins Medicine·JournalDevelopmental Cell·DateJun 8, 2007

AGU Journal Highlights -- June 7, 2007

Climate researchers predict salt marshes in Venice Lagoon may not survive future climate changes due to increased sea-level rise. Meanwhile, scientists have observed high-speed streams of charged particles called sprites, which blaze at incredible brightness and brief duration. The Amazon rainforest also emits large amounts of methane,...

SourceAmerican Geophysical Union·JournalGeophysical Research Letters·DateJun 8, 2007