At a depth of 2900 kilometres, the layer between the Earth's mantle and its core has always intrigued geophysicists because they are unable to explain the seismic data it generates. Researchers in the Solid State Structure and Properties Laboratory (CNRS/Université Lille 1/Lille National School for Advanced Chemistry) have studied its deformation which influences convection movements within the mantle or even those by tectonic plates. Despite the inaccessibility of this layer and the extreme conditions which prevail, they have succeeded in modelling the defects responsible for its deformation.

Antifreeze or “ice structuring” proteins – found in some fish, insects, plants, fungi and bacteria – attach to the surface of ice crystals to inhibit their growth and keep the host organism from freezing to death. Scientists have been puzzled, however, about why some ice structuring proteins, such as those found in the spruce budworm, are more active than others.

Fluorescence microscopy now has shown how those aggressive proteins protect the cells of the insect, which is native to U.S. and Canadian forests.

Omega-3 fatty acids, found in fatty fish like salmon, are associated with increased grey matter volume in areas of the brain commonly linked to mood and behavior according to a University of Pittsburgh study.

Findings will be presented today by Sarah M. Conklin, Ph.D., postdoctoral scholar at the Cardiovascular Behavioral Medicine Program in the department of psychiatry at the University of Pittsburgh, at the American Psychosomatic Society’s Annual Meeting, held in Budapest, Hungary.

Animal research has shown that raising omega-3 intake leads to structural brain changes. In a separate study presented by Dr.

The response of tumors to anticancer drugs has been observed in real-time 3-D images using technology developed at Purdue University.

The new digital holographic imaging system uses a laser and a charged couple device, or CCD, the same microchip used in household digital cameras, to see inside tumor cells. The device also may have applications in drug development and medical imaging.

"This is the first time holography has been used to study the effects of a drug on living tissue," said David D. Nolte, the Purdue professor of physics who leads the team. "We have moved beyond achieving a 3-D image to using that image for a direct physiological measure of what the drug is doing inside cancer cells.

Genetic tests using blood samples already are used to diagnose some diseases and even personalize treatment.

Now it is possible to develop similar tests that reveal a person's potential to become dependent on nicotine or marijuana or have antisocial personality disorder, University of Iowa researchers report online March 6 in the American Journal of Medical Genetics.

Such tests would not dictate who would become substance dependent or have behavioral problems, as genes do not function in isolation but are influenced by other genes and environmental factors, said the study's lead author Robert Philibert, M.D., Ph.D., professor of psychiatry in the UI Roy J. and Lucille A. Carver College of Medicine.

Tooth-brushing may trigger seizures in certain people with epilepsy, and researchers say lesions in a specific part of the brain may be a cause in some people, according to an article published in the March 6, 2007, issue of Neurology®, the scientific journal of the American Academy of Neurology.

The article reviewed the cases of three adults with epilepsy who experienced seizures while brushing their teeth. Two of the adults reported some of their seizures occurred when they brushed certain areas of their mouth. The seizures varied from jerking and twitching of the face to salivating vigorously. One patient was unable to let go of the toothbrush during the seizure.

The seizures were confirmed by video monitoring.