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Science News for June 23, 2005


Arsenic - not the same for everyone

Research reveals that an individual's genetic makeup determines how arsenic is metabolized, affecting disease risk. The study found a specific gene variant associated with altered urinary arsenic metabolites in children, but not adults.

SourceUniversity of Arizona·JournalEnvironmental Health Perspectives·DateJun 23, 2005

'Laser tweezers' reveal microscopic mechanical properties of blood clots

A team of researchers from the University of Pennsylvania School of Medicine has used laser tweezers to measure the mechanical properties of individual fibers in blood clots. The study reveals that clots deform primarily by bending of their fibers, rather than stretching, providing new insights into clot physiology.

SourceUniversity of Pennsylvania School of Medicine·JournalProceedings of the National Academy of Sciences·DateJun 23, 2005

MicroRNAs play a big part in gene regulation - and evolution

Researchers discovered extensive microRNA target gene predictions, assigning a biological function to 70% of all microRNAs. The findings provide insights into the importance and function of microRNAs across huge evolutionary time scales, shedding light on their role in shaping life's diversity.

SourcePLOS·JournalPLOS Computational Biology·DateJun 23, 2005

Mapping neuron connections in the brain

A new theoretical framework allows for two-dimensional drawings of neuron arbors, facilitating the creation of biologically realistic connection maps. This enables computer simulations of neural circuits involving tens of thousands of neurons, potentially unraveling brain mysteries.

SourcePLOS·JournalPLOS Computational Biology·DateJun 23, 2005

The shifty nature of grains

Duke University researchers used a novel system to trace stress flow in granular materials, finding jagged pathways in certain setups. The Chicago Materials Research Center also made significant discoveries, quantifying changes in stress propagation when grains shift from jammed to flowing states.

Thyroid-cancer test reveals recurrence early

Researchers developed a new test for thyroid cancer that can detect recurrence up to three years before symptoms appear. The test measures thyroglobulin levels after injecting patients with Thyrogen, allowing for earlier detection of the disease.

SourceOhio State University·JournalThe Journal of Clinical Endocrinology & Metabolism·DateJun 23, 2005