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Science News for March 16, 2005


X-chromosome tells the tale

The X-chromosome is characterized with well-developed disease genes, making it an all-star of chromosome studies. Researchers have shown that the Y chromosome 'dropped off the face of the earth,' containing few important genes, but crucial for sex determination.

SourceBaylor College of Medicine·JournalNature·DateMar 16, 2005

Specialist care gives better rate of survival

Regular cardiovascular follow-up visits with a specialist significantly improve outcomes for heart failure patients, reducing emergency room visits and mortality rates. Access to specialty care is particularly important for elderly and rural patients, who often face barriers to timely treatment.

SourceUniversity of Alberta·JournalCanadian Medical Association Journal·DateMar 16, 2005

U-M team makes synthetic mother of pearl

Researchers at the University of Michigan have successfully created an artificial version of mother of pearl, a naturally occurring compound that is several times stronger than nylon. By layering molecules on top of each other, scientists can engineer the mechanical properties of the material to suit specific applications.

Men and women: The differences are in the genes

A recent study published in Nature found that genes on the inactive X chromosome can escape inactivation and be expressed in females, leading to a stronger overall concentration of particular genes. This discovery could explain some of the differences between men and women that aren't attributable to sex hormones.

SourcePenn State·JournalNature·DateMar 16, 2005

New factor affects fertility

Research reveals that mice lacking TAF4b initially exhibit fertility but later become infertile due to progressive loss of maturing germ cells. The study's findings highlight the crucial role of TAF4b in sperm production and may have implications for human male fertility.

SourceBaylor College of Medicine·JournalGenes & Development·DateMar 16, 2005

Brain imaging study may hold clues to onset of schizophrenia in people at high risk

A recent brain imaging study found that individuals at high risk for schizophrenia show altered neural activity in the prefrontal cortex, suggesting biological changes prior to disease onset. The study used fMRI scans to identify potential biomarkers of vulnerability, which could aid in early intervention and treatment.

SourceUniversity of North Carolina Health Care·JournalArchives of General Psychiatry·DateMar 16, 2005

Teenage highs and lows

A study of over 13,700 US school students found that those involved in substance use, delinquency, and school problems were at high risk for continued marijuana use. The study identified five stages of marijuana involvement and recommended targeting these areas for prevention efforts.

SourceCardiff University·JournalArchives of General Psychiatry·DateMar 16, 2005

US life expectancy about to decline, researchers say

A recent study suggests that obesity may be overestimating Social Security forecasts, with a potential decline in life expectancy of four to nine months. The researchers attribute this effect to the growing obesity epidemic, particularly among children and teenagers, which could lead to increased mortality rates and healthcare costs.

SourceUniversity of Illinois Chicago·JournalNew England Journal of Medicine·DateMar 16, 2005