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Thursday, December 8, 2011

ScienceDaily: Most Popular News

ScienceDaily: Most Popular News


NASA Mars rover finds mineral vein deposited by water

Posted: 07 Dec 2011 03:20 PM PST

NASA's Mars Exploration Rover Opportunity has found bright veins of a mineral, apparently gypsum, deposited by water. Analysis of the vein will help improve understanding of the history of wet environments on Mars.

Changes in bioelectric signals trigger formation of new organs: Tadpoles made to grow eyes in back, tail

Posted: 07 Dec 2011 02:57 PM PST

For the first time, scientists have altered natural bioelectrical communication among cells to directly specify the type of new organ to be created at a particular location within a vertebrate organism. Using genetic manipulation of membrane voltage in Xenopus (frog) embryos, biologists were able to cause tadpoles to grow eyes outside of the head area. The researchers achieved most surprising results when they manipulated membrane voltage of cells in the tadpole's back and tail, well outside of where the eyes could normally form.

Economic recession takes toll on family relationships

Posted: 07 Dec 2011 02:57 PM PST

Researchers studied how parents' financial problems and resulting mental distress affect their relationships with their children. They found that parents who experience financial problems and depression are less likely to feel connected to their children, and their children are less likely to engage in prosocial behaviors, such as volunteering or helping others.

Safe way to repair sickle cell disease genes, study suggests

Posted: 07 Dec 2011 02:57 PM PST

Researchers have developed a way to use patients' own cells to potentially cure sickle cell disease and many other disorders caused by mutations in a gene that helps produce blood hemoglobin.

Multiple sclerosis often starts in brain's outer layers

Posted: 07 Dec 2011 02:56 PM PST

Multiple sclerosis may progress from the outermost layers of the brain to its deep parts, and isn't always an "inside-out" process as previously thought, reported a new study. The traditional understanding is that the disease begins in the white matter that forms the bulk of the brain's inside, and extends to involve the brain's superficial layers, the cortex. Study findings support an opposite, outside-in process.

Stress reduction and mindful eating curb weight gain among overweight women

Posted: 07 Dec 2011 12:24 PM PST

Mastering simple mindful eating and stress-reduction techniques helped prevent weight gain even without dieting in overweight women.

Novel drug wipes out deadliest malaria parasite through starvation

Posted: 07 Dec 2011 12:24 PM PST

An antimalarial agent proved effective at clearing infections caused by the malaria parasite most lethal to humans -- by literally starving the parasites to death.

Researchers suggest unconventional approach to control HIV epidemics

Posted: 07 Dec 2011 12:24 PM PST

A new weapon to prevent HIV infection, called pre-exposure prophylaxis, Because PrEP is based on the same drugs used to treat HIV-infected individuals, the big public health scare is that the dual use of these drugs will lead to skyrocketing levels of drug resistance. In fact, say researchers in a new study, that is not the case and indeed, the exact opposite is likely to happen.

Why does the same mutation kill one person but not another?

Posted: 07 Dec 2011 12:23 PM PST

The vast majority of genetic disorders (schizophrenia or breast cancer, for example) have different effects in different people. Moreover, an individual carrying certain mutations can develop a disease, whereas another one with the same mutations may not. This holds true even when comparing two identical twins who have identical genomes. But why does the same mutation have different effects in different individuals?

SETI search resumes at Allen Telescope Array, targeting new planets

Posted: 07 Dec 2011 10:48 AM PST

The Allen Telescope Array (ATA) is once again searching planetary systems for signals that would be evidence of extraterrestrial intelligence. Among its first targets are some of the exoplanet candidates recently discovered by NASA's Kepler space telescope.

Drug duo kills chemotherapy-resistant ovarian cancer cells, researchers find

Posted: 07 Dec 2011 10:30 AM PST

The use of two drugs never tried in combination before in ovarian cancer resulted in a 70 percent destruction of cancer cells already resistant to commonly used chemotherapy agents, say researchers.

Why aren't we smarter already? Evolutionary limits on cognition

Posted: 07 Dec 2011 10:30 AM PST

We put a lot of energy into improving our memory, intelligence, and attention. There are even drugs that make us sharper, such as Ritalin and caffeine. But maybe smarter isn't really all that better. A new warns warns that there are limits on how smart humans can get, and any increases in thinking ability are likely to come with problems.

Shedding light on why it is so 'tough' to make healthier hot dogs

Posted: 07 Dec 2011 10:30 AM PST

In part of an effort to replace animal fat in hot dogs, sausages, hamburgers and other foods with healthier fat, scientists are reporting an advance in solving the mystery of why hot dogs develop an unpleasant tough texture when vegetable oils pinch hit for animal fat.

A 'wild card' in your genes

Posted: 07 Dec 2011 10:30 AM PST

The human genome and the endowments of genes in other animals and plants are like a deck of poker cards containing a "wild card" that in a genetic sense introduces an element of variety and surprise that has a key role in life. That's what scientists are describing in a review of more than 100 studies on the topic.

Sewage treatment plants may contribute to antibiotic resistance problem

Posted: 07 Dec 2011 10:30 AM PST

Water discharged into lakes and rivers from municipal sewage treatment plants may contain significant concentrations of the genes that make bacteria antibiotic-resistant. That's the conclusion of a new study on a sewage treatment plant on Lake Superior in the Duluth, Minn., harbor.

Gene expression in mouse neural retina sequenced

Posted: 07 Dec 2011 10:30 AM PST

Researchers have gained new insights into neural disease genes by sequencing virtually all the gene expression in the mouse neural retina. The technology to obtain such a "transcriptome" has become accessible enough that full-scale sequencing is becoming the preferred method for asking genetics questions.

One of the world's smallest electronic circuits created

Posted: 07 Dec 2011 10:29 AM PST

Scientists have engineered one of the world's smallest electronic circuits. It is formed by two wires separated by only about 150 atoms or 15 nanometers.

North America's biggest dinosaur revealed

Posted: 07 Dec 2011 10:29 AM PST

New research has unveiled enormous bones from North America's biggest dinosaur. Researchers collected two gigantic vertebrae and a femur in New Mexico. The bones belong to the sauropod dinosaur Alamosaurus sanjuanensis: a long-necked plant eater related to Diplodocus. The Alamosaurus roamed what is now the southwestern United States and Mexico about 69 million years ago.

Solar power much cheaper to produce than most analysts realize, study finds

Posted: 07 Dec 2011 10:29 AM PST

The public is being kept in the dark about the viability of solar photovoltaic energy, according to a new study.

First realistic 3D reconstruction of a brain circuit

Posted: 07 Dec 2011 10:29 AM PST

Researchers report that, using a conceptually new approach and state-of-the-art research tools, they have created the first realistic three-dimensional diagram of a thalamocortical column in the rodent brain. This is the first step toward creating a complete computer model of the brain, and may ultimately lead to an understanding of how the brain computes and how it goes awry in disease.

Traumatic injury sets off a 'genomic storm' in immune system pathways

Posted: 07 Dec 2011 10:29 AM PST

Serious traumatic injuries, including major burns, set off a "genomic storm" in human immune cells, altering around 80 percent of the cells' normal gene expression patterns.

World's first super predator had remarkable vision

Posted: 07 Dec 2011 10:29 AM PST

Scientists working on fossils from Kangaroo Island, South Australia, have found eyes belonging to a giant 500 million-year-old marine predator that sat at the top of the earth's first food chain.

Research could help people with declining sense of smell

Posted: 07 Dec 2011 10:26 AM PST

Cells in the nose – smell sensors, primarily – are constantly replaced as old ones die off. Olfactory stem cells are the source for these new cells, but how do they determine when to form mature cells? Neuroscientists have now found a genetic trigger – a transcription factor – that acts as a brake on differentiation. Removing it makes stem cells change into mature olfactory cells at the expense of self-renewal.

Middle-class elementary students ask for help more than working-class peers

Posted: 07 Dec 2011 10:26 AM PST

Middle-class children ask their teachers for help more often and more assertively than working-class children and, in doing so, receive more support and assistance from teachers.

Drug reverses aging-associated changes in brain cells, animal study shows

Posted: 07 Dec 2011 08:35 AM PST

Drugs that affect the levels of an important brain protein involved in learning and memory reverse cellular changes in the brain seen during aging, according to an animal study.

Maternal care influences brain chemistry into adulthood, animal study shows

Posted: 07 Dec 2011 08:30 AM PST

The effect of the messenger substance neuropeptide Y depends on the behavior of the mother during infancy.

Best routes found to self-assembling 3-D shapes

Posted: 07 Dec 2011 08:30 AM PST

Researchers have found optimal configurations for creating 3-D geometric shapes — like tiny, highly simplified geodesic domes that assemble by themselves. The team developed the algorithmic tools and tested selected configurations. The research may lead to advances from drug-delivery containers to 3-D sensors and electronic circuits.

Vampire star reveals its secrets

Posted: 07 Dec 2011 07:54 AM PST

Astronomers have obtained the best images ever of a star that has lost most of its material to a vampire companion. By combining the light captured by telescopes at the European Southern Observatory's Paranal Observatory they created a virtual telescope 130 meters across with vision 50 times sharper than the NASA/ESA Hubble Space Telescope. Surprisingly, the new results show that the transfer of mass from one star to the other in this double system is gentler than expected.

Short walk cuts chocolate consumption in half

Posted: 07 Dec 2011 07:53 AM PST

A 15-minute walk can cut snacking on chocolate at work by half, according to new research. The study showed that, even in stressful situations, workers eat only half as much chocolate as they normally would after this short burst of physical activity.

Heads up, Kobe Bryant: Researchers discover that trying for another 3-pointer is a mistake

Posted: 07 Dec 2011 07:49 AM PST

Researchers shattered the myth that players who score one or more three-pointers improve their odds of scoring another. A new report raises doubts about the ability of athletes in particular, and people in general, to predict future success based on past performance.

Avatars help people develop real world skills

Posted: 07 Dec 2011 07:48 AM PST

New research suggests that far from disengaging young people from real life, virtual worlds can provide unique environments that can help them learn and negotiate new situations.

Geneticists help show bitter taste perception is not just about flavors

Posted: 06 Dec 2011 09:08 PM PST

Long the bane of picky eaters everywhere, broccoli's taste is not just a matter of having a cultured palate; Some people can easily taste a bitter compound in the vegetable that others have difficulty detecting. Now a team researchers has helped uncover the evolutionary history of one of the genes responsible for this trait. Beyond showing the ancient origins of the gene, the researchers discovered something unexpected: Something other than taste must have driven its evolution.

New '3-D' transistors promising future chips, lighter laptops

Posted: 06 Dec 2011 12:15 PM PST

Researchers have created a new type of transistor made from a material that could replace silicon and have a 3-D structure instead of conventional flat computer chips.

Computer simulations shed light on the physics of rainbows

Posted: 06 Dec 2011 12:15 PM PST

Computer scientists who set out to simulate all rainbows found in nature, wound up answering questions about the physics of rainbows as well. The scientists recreated a wide variety of rainbows by using an improved method for simulating how light interacts with water drops of various shapes and sizes. Their new approach even yielded realistic simulations of difficult-to-replicate "twinned" rainbows that split their primary bow in two.

Insecticides an increasing problem in future for streams in Europe

Posted: 06 Dec 2011 10:14 AM PST

Europe's streams will in future be more heavily polluted with insecticides than before. The risks for streams caused by the use of insecticides in agriculture will increase significantly in many regions of Europe, and particularly in Scandinavia, the Baltic countries and in Central Europe, according to scientists.

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