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Science News for March 26, 2008


Brain's 'sixth sense' for calories discovered

The brain can detect calorie content in food independently of taste, according to a study published in Neuron. The research found that the brain's reward system is activated by caloric intake, leading to a preference for calorie-containing foods over non-caloric sweeteners.

Does an official government apology really make amends?

Researchers found that official apologies can create a perception of remorse, but their effectiveness in promoting forgiveness is limited. The study suggests that intergroup apologies should be considered as part of a long process of reconciliation rather than a magic solution to heal past wounds.

SourceSAGE·JournalPersonality and Social Psychology Bulletin·DateMar 26, 2008

Umbilical cord blood cell therapy in an animal model of Alzheimer's disease

Researchers found that human umbilical cord blood cell therapy significantly reduced amyloid-β and β-amyloid plaques in mice with Alzheimer's-like disease. The treatment modulates the immune system by suppressing CD40-CD40L activity, offering potential for targeting inflammatory responses associated with degenerative conditions.

SourceMary Ann Liebert, Inc./Genetic Engineering News·JournalStem Cells and Development·DateMar 26, 2008

Conservation of freshwater fish biodiversity: a challenge for the countries of the South

A recent study identifies seven regions where non-native freshwater fish species make up over a quarter of the recorded species, highlighting the need for surveillance and precautionary measures. The research suggests that human economic activities are the main driving factor behind exotic species invasions in these regions.

Faster koa tree growth without adverse ecosystem effects

USDA scientists have developed a method to grow high-value koa trees faster while maintaining biodiversity, carbon sequestration, and scenic beauty in native Hawaiian forests. The study's findings show that low-impact silvicultural treatments increase wood production without harming native understory vegetation or bird habitats.

SourceUSDA Forest Service - Pacific Southwest Research Station·JournalForest Ecology and Management·DateMar 26, 2008

Long-term use of mechanical ventilation contributes to the deterioration of human diaphragm muscle

Researchers found a significant decline in muscle fibers in the diaphragm after just 18 hours of mechanical ventilation. The study's results suggest that intervening in the molecular pathway responsible for muscle wasting could lead to the development of a new pharmacological approach to safely wean patients off ventilators.

SourceUniversity of Pennsylvania School of Medicine·JournalNew England Journal of Medicine·DateMar 26, 2008

Who's bad? Chimps figure it out by observation

In experiments, chimpanzees showed an ability to recognize and generalize behavioral traits in strangers, forming reputation judgments based on observation. This finding suggests that chimps may possess a system for attributing reputation, a crucial feature of cooperative exchanges.

SourceSpringer·JournalAnimal Cognition·DateMar 26, 2008

Compulsive gamblers always down on their luck

A study published in Clinical Practice and Epidemiology in Mental Health found that pathological gamblers exhibit cognitive rigidity, which hinders their ability to learn from mistakes. This rigidity affects the prefrontal region of the brain, leading to impulsive behavior and compulsive gambling.

SourceBMC (BioMed Central)·JournalClinical Practice and Epidemiology in Mental Health·DateMar 26, 2008