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Science News Archive February 2007 - Page 10


Page 10 of 16

Research paper examines depression in 3 cities in Pakistan

A recent study published in PLOS ONE found significant regional variation in depression rates among households in Lahore, Quetta, and Karachi. Middle-aged females with secondary school education were most affected, highlighting the need to revise existing mental health policies.

SourcePLOS·JournalPLOS ONE·DateFeb 13, 2007

Local range estimation in wild animals

A new class of computational methods, called LoCoH (local convex hull) methods, has been developed to construct distributions of where monitored organisms are most likely to be found in space and time. These methods have proven especially useful in evaluating the spatial needs of threatened species and designing parks to conserve them.

SourcePLOS·JournalPLOS ONE·DateFeb 13, 2007

Reduction of body iron stores and cardiovascular outcomes

A recent study published in JAMA found that reducing body iron stores through phlebotomy in patients with peripheral artery disease did not significantly decrease the risk of death or nonfatal cardiovascular events. However, younger patients and those without diabetes showed apparent improvement with iron reduction.

SourceJAMA Network·JournalJAMA·DateFeb 13, 2007

DNA ends: Common tool, different job

Researchers at the Salk Institute have discovered a novel RPA-like complex that specifically targets the short single-stranded DNA tail end of yeast chromosomes. This complex helps maintain telomere integrity and prevent premature senescence or cancer development.

SourceSalk Institute·JournalNature Structural & Molecular Biology·DateFeb 13, 2007

Ready when you are

Researchers found females mature earlier when shown males with long 'swords', while young males delayed maturity to avoid competition. This is the first evidence of a species adjusting sexual maturation based on visual cues.

SourceUniversity of Exeter·JournalBiology Letters·DateFeb 13, 2007

The chimpanzee stone age

Researchers discovered evidence that chimpanzees used stone tools to crack nuts around 4300 years ago, pushing back the origin of this behavior by thousands of years. The study found similarities between chimpanzee and human ancestors' cultural attributes, suggesting a possible common ancestor for these behaviors.

SourceMax-Planck-Gesellschaft·JournalProceedings of the National Academy of Sciences·DateFeb 13, 2007

'Benign' MS may not be so benign

A new study published by the American Academy of Neurology found that people with 'benign MS' for 10 years are at risk of disease progression after 20 years. After 20 years, nearly half of those with benign MS had progressed to a point where they needed a cane to walk.

SourceAmerican Academy of Neurology·JournalNeurology·DateFeb 12, 2007

Vasectomy may put men at risk for type of dementia

Researchers found that men with Primary Progressive Aphasia (PPA) had a higher rate of vasectomy than those without the condition. PPA is a neurological disease causing language problems, while frontotemporal dementia (FTD) affects personality and behavior. The study suggests a possible link between vasectomy and increased risk of thes...

Landmark Carnegie Mellon addiction study finds people underestimate power of drug cravings

A landmark Carnegie Mellon University study found that people who know they are addicted to drugs tend to underestimate the intensity of their cravings. This underestimation can lead to a higher willingness to take risks and engage in behaviors that increase the likelihood of relapse. The study suggests that teaching individuals to ant...

SourceCarnegie Mellon University·JournalJournal of Health Economics·DateFeb 12, 2007

New medical technique punches holes in target cell membranes to treat tumors

A new medical technique using microsecond electrical pulses has been shown to create permanent nanoscale holes in target cell membranes without harming surrounding tissue. This technique, called irreversible electroporation (IRE), has the potential to revolutionize minimally invasive surgical treatments for tumors.

SourceUniversity of California - Berkeley·JournalTechnology in Cancer Research & Treatment·DateFeb 12, 2007

Happy endings aren't always best

A new study by Aparna A. Labroo and Suresh Ramanathan challenges the common assumption that happy endings in advertising are always better. Emotionally involved viewers actually prefer narratives with a negative-to-positive arc, as it allows them to cope with subsequent negativity.

SourceUniversity of Chicago Press Journals·JournalJournal of Consumer Research·DateFeb 12, 2007

Marijuana relieves HIV nerve pain

A study published in Neurology found that smoking marijuana reduced nerve pain in people with HIV-associated sensory neuropathy by 34%, compared to 17% for those who received a placebo. The study also showed significant relief from chronic pain, with an average reduction of 72%.

SourceAmerican Academy of Neurology·JournalNeurology·DateFeb 12, 2007

Yale biologists 'trick' viruses into extinction

Researchers at Yale University developed a method to trap viruses in cells that prevent their reproduction, potentially alleviating disease. By using 'trap cells' with viral binding sites, the virus population declines towards extinction when the number of trap cells exceeds a threshold.

SourceYale University·JournalEcology Letters·DateFeb 12, 2007

Are some people immune to avian flu?

A study published in PLoS Medicine found that some people have low-titer antibodies against H5N1 influenza, suggesting potential protection. The researchers also observed cross-reactive antibodies in mice, which afforded partial protection against avian H5N1 infection.

SourcePLOS·JournalPLOS Medicine·DateFeb 12, 2007

Increased risks of planned cesarean births must be clearly conveyed

A study published in the Canadian Medical Association Journal found that women having a planned cesarean section are at a significantly higher risk of severe complications. The rate of severe complications was found to be 27.3 per 1000 deliveries for cesarean sections, compared to 9.0 per 1000 deliveries for vaginal deliveries.

SourceCanadian Medical Association Journal·JournalCanadian Medical Association Journal·DateFeb 12, 2007

Scientists clone mice from adult skin stem cells

Researchers at Rockefeller University have successfully cloned mice from adult skin stem cells using nuclear transfer, with a success rate of 19 out of 100 attempts. This breakthrough could lead to the creation of personalized embryonic stem cell lines for disease research and treatment.

SourceRockefeller University·JournalProceedings of the National Academy of Sciences·DateFeb 12, 2007