Biology News Net

Biologists discover bacterial defense mechanism against aggressive oxygen

Fri, 20 Nov 2009 15:12:27 -0500

Bacteria possess an ingenious mechanism for preventing oxygen from harming the building blocks of the cell. This is the new finding of a team of biologists that includes Joris Messens of VIB, a life sciences research institute in Flanders, Belgium, connected to the Vrije Universiteit Brussel. The scientists made this discovery by modifying the DNA of the intestinal bacterium Escherichia coli. By means of this model organism, they have uncovered the existence of a mechanism that repairs proteins in the cell that have been damaged by oxygen. There are indications that a similar repair system is active in human cells. The research results are being published in the eminent scientific journal Science. At the same time, the researchers are posting an animation online that illustrates the finding.

Just like old times: Generating RNA molecules in water

Fri, 20 Nov 2009 15:12:26 -0500

A key question in the origin of biological molecules like RNA and DNA is how they first came together billions of years ago from simple precursors. Now, in a study appearing in this week's JBC, researchers in Italy have reconstructed one of the earliest evolutionary steps yet: generating long chains of RNA from individual subunits using nothing but warm water.

Small nanoparticles bring big improvement to medical imaging

Wed, 18 Nov 2009 16:30:58 -0500

If you're watching the complex processes in a living cell, it is easy to miss something important—especially if you are watching changes that take a long time to unfold and require high-spatial-resolution imaging. But new research* makes it possible to scrutinize activities that occur over hours or even days inside cells, potentially solving many of the mysteries associated with molecular-scale events occurring in these tiny living things.

Extinct moa rewrites New Zealand's history

Wed, 18 Nov 2009 16:30:58 -0500

DNA recovered from fossilised bones of the moa, a giant extinct bird, has revealed a new geological history of New Zealand, reports a study published this week in the Proceedings of the National Academy of Sciences.

Scientists unravel evolution of highly toxic box jellyfish

Wed, 18 Nov 2009 16:30:57 -0500

With thousands of stinging cells that can emit deadly venom from tentacles that can reach ten feet in length, the 50 or so species of box jellyfish have long been of interest to scientists and to the public. Yet little has been known about the evolution of this early branch in the animal tree of life.

UCLA study shows brain's ability to reorganize

Wed, 18 Nov 2009 16:30:57 -0500

Visually impaired people appear to be fearless, navigating busy sidewalks and crosswalks, safely finding their way using nothing more than a cane as a guide. The reason they can do this, researchers suggest, is that in at least some circumstances, blindness can heighten other senses, helping individuals adapt.

Immune system activated in schizophrenia

Wed, 18 Nov 2009 16:30:57 -0500

Researchers at the Swedish medical university Karolinska Institutet have discovered that patients with recent-onset schizophrenia have higher levels of inflammatory substances in their brains. Their findings offer hope of being able to treat schizophrenia with drugs that affect the immune system.

Ladybugs taken hostage by wasps

Tue, 17 Nov 2009 16:29:10 -0500

Are ladybugs being overtaken by wasps? A Université de Montréal entomologist is investigating a type of wasp (Dinocampus coccinellae) present in Quebec that forces ladybugs (Coccinella maculata) to carry their larvae. These wasps lay their eggs on the ladybug's body, a common practice in the insect world, yet they don't kill their host.

Depression as deadly as smoking, but anxiety may be good for you

Tue, 17 Nov 2009 16:29:10 -0500

A study by researchers at the University of Bergen, Norway, and the Institute of Psychiatry (IoP) at King's College London has found that depression is as much of a risk factor for mortality as smoking.

Solving the 50-year-old puzzle of thalidomide

Tue, 17 Nov 2009 16:29:09 -0500

Research into the controversial drug thalidomide reveals that the mechanism through which the drug causes limb defects is the same process which causes it to damage internal organs and other tissues. The article, published in Bio-Essays, outlines the challenges surrounding thalidomide research and claims that confirmation of a 'common mechanism' could lead to new treatments for Leprosy, Crohn's Disease, AIDS and some forms of cancer.

Study: Sea stars bulk up to beat the heat

Tue, 17 Nov 2009 16:29:08 -0500

A new study finds that a species of sea star stays cool using a strategy never before seen in the animal kingdom. The sea stars soak up cold sea water into their bodies during high tide as buffer against potentially damaging temperatures brought about by direct sunlight at low tide.

Pushing the brain to find new pathways

Tue, 17 Nov 2009 16:29:07 -0500

Until recently, scientists believed that, following a stroke, a patient had about six months to regain any lost function. After that, patients would be forced to compensate for the lost function by focusing on their remaining abilities. Although this belief has been refuted, a University of Missouri occupational therapy professor believes that the current health system is still not giving patients enough time to recover and underestimating what the human brain can do given the right conditions.

Scientists guide immune cells with light and microparticles

Mon, 16 Nov 2009 17:19:50 -0500

A team led by Yale University scientists has developed a new approach to studying how immune cells chase down bacteria in our bodies. Their findings are described in the November 15 issue of Nature Methods Advanced Online Publication.

Right-handed chimpanzees provide clues to the origin of human language

Mon, 16 Nov 2009 17:19:50 -0500

Most of the linguistic functions in humans are controlled by the left cerebral hemisphere. A study of captive chimpanzees at the Yerkes National Primate Research Center (Atlanta, Georgia), reported in the January 2010 issue of Elsevier's Cortex (http://www.elsevier.com/locate/cortex), suggests that this "hemispheric lateralization" for language may have its evolutionary roots in the gestural communication of our common ancestors. A large majority of the chimpanzees in the study showed a significant bias towards right-handed gestures when communicating, which may reflect a similar dominance of the left hemisphere for communication in chimpanzees as that seen for language functions in humans.