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Science News for December 12, 2005


Moms' employment affects kids' food sources

A study found that employed mothers' kids consumed fewer calories and less nutritious foods at home but increased consumption of fruits and vegetables at school. The researchers noted a lack of correlation between maternal employment time and nutritional intake, suggesting individual balance is necessary.

Magnetic transistor could 'dial in' quantum effects

Physicists propose a nanoscale magnetic probe to study entanglement at a quantum critical point, potentially leading to breakthroughs in high-temperature superconductivity. The probe could provide controlled and tunable settings for studying quantum effects, including spin waves and electron tunneling.

SourceRice University·JournalProceedings of the National Academy of Sciences·DateDec 12, 2005

Pollination networks key to ecosystem sustainability

A new study suggests that declining biodiversity in pollination networks may threaten plant community persistence. The experimentally manipulated plant and pollinator interactions show increased pollination efficiency with complementary insect and flower pairings.

SourcePLOS·JournalPLOS Biology·DateDec 12, 2005

Key brain regulatory gene shows evolution in humans

Researchers discovered a distinctive variant of the prodynorphin gene in humans, which increases production of neuropeptide prodynorphin. This variant is linked to increased brain size, memory, perception, and sensitivity to pain, as well as potential risks for drug addiction, schizophrenia, and bipolar disorders.

SourceDuke University·JournalPublication Library and Information Science·DateDec 12, 2005

Relationship between incarceration and race disparities in US HIV rates explored

Research examines how drug policy affects incarceration rates and HIV infection levels among African Americans, who make up 40% of those incarcerated and 50% of new HIV diagnoses. The study calls for further research on the corrections system's impact on HIV risk and recommends investigating specific components of drug policy.

SourceYale University·JournalJournal of Health Care for the Poor and Underserved·DateDec 12, 2005

Gene increases risk of tuberculosis

A recent scientific study found that a specific gene variation on chromosome 17 is associated with an increased risk of developing active tuberculosis. The MCP-1 protein, which attracts immune cells to sites of infection, was found to play a crucial role in the early immune response to TB-causing bacteria.

SourceJournal of Experimental Medicine·JournalJournal of Experimental Medicine·DateDec 12, 2005