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Scientific American - Objets Actus

Does Herpes Cause Brain Cancer?
Jeudi 03 Juillet 2008 - 08:00 - 5 mois depuis - Cancer - Scientific American
The deadliest and most common type of brain cancer has a strange bedfellow: cytomegalovirus, a kind of herpes present in about 80 percent of the U.S. population. Now scientists are exploiting this coincidence to treat the cancer with a vaccine that targets the virus and slows tumor regrowth. [More]

Could Our Own Proteins Be Used to Help Us Fight Cancer?
Mercredi 02 Juillet 2008 - 06:33 - 5 mois depuis - Cancer - Scientific American
In 1962 someone at the Genetics Institute in Pavia, Italy, turned up the temperature in an incubator holding fruit flies. When Ferruccio Ritossa, then a young geneticist, examined the cells of these “heat shocked” flies, he noticed that their chromosomes had puffed up at discrete locations. The puffy appearance was a known sign that genes were being activated in those regions to give rise to their encoded proteins, so those sites of activity became known as the heat shock loci.The effect was reproducible but initially considered to be unique to the fruit fly. It took another 15 years before the proteins generated when these chromosome puffs appear were detected in mammals and other forms of life. In what is certainly among the most absorbing stories in contemporary biology, heat shock proteins (HSPs) have since been recognized as occupying a central role in all life--not just at the level of cells but of organisms and whole populations. [More]

Updates: Whatever Happened to Protecting Cells from Radiation? [Scientific American Magazine]
Vendredi 27 Juin 2008 - 06:18 - 5 mois, 1 semaine depuis - Cancer - Scientific American
Ozone Recovery, Warmer AntarcticaThe Antarctic ozone hole that forms every spring has kept that continent's interior cold even as the rest of the world has warmed over the past few decades [see "A Push from Above"; SciAm, August 2002]. Thanks to the global ban on chlorofluorocarbons, stratospheric ozone levels there are slowly recovering. A repaired hole, however, could speed Antarctic ice melting and change weather patterns, according to a computer model by Judith Perlwitz of the University of Colorado at Boulder and her colleagues. With more ozone, the lower stratosphere would absorb more ultraviolet light and warm up by as much as nine degrees Celsius. That in turn would break down circulation patterns that trap cold air over Antarctica's interior, making the continent heat up. The changed patterns would also make Australia warmer and drier, and South America could get wetter. Such ozone details may need to be worked into global climate models, most of which have neither incorporated such effects nor included enough of the stratosphere. The journal Geophysical Research Letters published the study on April 26. [More]

Updates: Whatever Happened to Protecting Cells from Radiation?
Vendredi 27 Juin 2008 - 06:18 - 5 mois, 1 semaine depuis - Cancer - Scientific American
Ozone Recovery, Warmer AntarcticaThe Antarctic ozone hole that forms every spring has kept that continent's interior cold even as the rest of the world has warmed over the past few decades [see "A Push from Above"; SciAm, August 2002]. Thanks to the global ban on chlorofluorocarbons, stratospheric ozone levels there are slowly recovering. A repaired hole, however, could speed Antarctic ice melting and change weather patterns, according to a computer model by Judith Perlwitz of the University of Colorado at Boulder and her colleagues. With more ozone, the lower stratosphere would absorb more ultraviolet light and warm up by as much as nine degrees Celsius. That in turn would break down circulation patterns that trap cold air over Antarctica's interior, making the continent heat up. The changed patterns would also make Australia warmer and drier, and South America could get wetter. Such ozone details may need to be worked into global climate models, most of which have neither incorporated such effects nor included enough of the stratosphere. The journal Geophysical Research Letters published the study on April 26. [More]

Existing Drug Reverses a Form of Mental Retardation in Mice [News]
Mercredi 25 Juin 2008 - 16:00 - 5 mois, 1 semaine depuis - Cancer - Scientific American
A drug already on the market for a completely unrelated condition could be used to treat a form of mental retardation linked to autism--if the results of a study in mice hold up, researchers report. [More]

Existing Drug Reverses a Form of Mental Retardation in Mice
Mercredi 25 Juin 2008 - 16:00 - 5 mois, 1 semaine depuis - Cancer - Scientific American
A drug already on the market for a completely unrelated condition could be used to treat a form of mental retardation linked to autism--if the results of a study in mice hold up, researchers report. [More]

Mysterious Brain Cells Linked to Blood Flow [News]
Vendredi 20 Juin 2008 - 10:00 - 5 mois, 2 semaines depuis - Cancer - Scientific American
Nearly a century after the discovery of strange star-shaped cells in the brain, scientists say they have finally begun to unravel their function. [More]

Mysterious Brain Cells Linked to Blood Flow
Vendredi 20 Juin 2008 - 10:00 - 5 mois, 2 semaines depuis - Cancer - Scientific American
Nearly a century after the discovery of strange star-shaped cells in the brain, scientists say they have finally begun to unravel their function. [More]

Patient, Heal Thyself: Body's Own Immune Cells Whack Late-Stage Tumor [News]
Mercredi 18 Juin 2008 - 17:00 - 5 mois, 2 semaines depuis - Cancer - Scientific American
In what could be a breakthrough in cancer therapy, researchers report in The New England Journal of Medicine today that they succeeded in bolstering a patient's immune system enough to wipe out late-stage malignant tumors on its own. The scientists say the successful experiment could pave the way for new treatments of advanced cancer that spare patients the side effects of chemotherapy, which kills healthy as well as malignant cells. [More]

Patient, Heal Thyself: Body's Own Immune Cells Whack Late-Stage Tumor
Mercredi 18 Juin 2008 - 17:00 - 5 mois, 2 semaines depuis - Cancer - Scientific American
In what could be a breakthrough in cancer therapy, researchers report in The New England Journal of Medicine today that they succeeded in bolstering a patient's immune system enough to wipe out late-stage malignant tumors on its own. The scientists say the successful experiment could pave the way for new treatments of advanced cancer that spare patients the side effects of chemotherapy, which kills healthy as well as malignant cells. [More]

Actus fournies par : Scientific American

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