In a survey of more than one thousand infertility patients with frozen embryos, 60 percent of patients report that they are likely to donate their embryos to stem cell research, a level of donation that could result in roughly 2000 to 3000 new embryonic stem cell lines.

In August of 2001, less than two dozen embryonic stem cell lines were made eligible for federal research funding. Most scientists now agree that the eligible lines have proven inadequate in number and unsafe for transnational research.

Until recently, the best estimate of human embryos currently in storage that might be available for additional stem cell research was three percent. The 2003 study showed that donations would yield, at best, less than 300 new lines.

A new type of stainless steel alloy developed at Oak Ridge National Laboratory could allow for significantly increased operating temperatures and corresponding increases in efficiency in future energy production systems.

The new alloys offer superior oxidation resistance compared to conventional stainless steels, without significant increased cost or decreased creep resistance (sagging at high temperature). What sets this proprietary material apart from other stainless steels is its ability to form protective aluminum oxide scales instead of chromium oxide scales.

The combination of creep and oxidation resistance offered by these alloys previously was available only with nickel-base alloys, which are about five times more costly than the new stainless steels.

New study finds the key to understanding the global spread of AIDS is the size of the infected prostitute community around the world.

In new academic research published today in the online, open-access, peer-reviewed scientific journal PLoS ONE, male circumcision is found to be much less important as a deterrent to the global AIDS pandemic than previously thought. The author, John R. Talbott, has conducted statistical empirical research across 77 countries of the world and has uncovered some surprising results.

The new study finds that the number of infected prostitutes in a country is the key to explaining the degree to which AIDS has infected the general population.

A major question in evolutionary studies today is how early did humans begin to think and behave in ways we would see as fundamentally modern?

One index of ‘behavioral modernity’ is in the appearance of objects used purely as decoration or ornaments. Such items are widely regarded as having symbolic rather than practical value. By displaying them on the body as necklaces, pendants or bracelets or attached to clothing this also greatly increased their visual impact. The appearance of ornaments may be linked to a growing sense of self-awareness and identity amongst humans and any symbolic meanings would have been shared by members of the same group.

Pheromones are a key reason many creatures, including humans, meet. In addition, while mating recognition systems in each species might be unique, pheromones are considered the important common denominator there also.

The mating 'language' is a key reason unacceptable mutants that use slightly different signals die off without any offspring. Even among moth species with different types of males and females, two different kinds of pheromones are in action, which was assumed to be the key factor in mate selection.

Not so, say researchers from the Institut National de la Recherche Agronomique, the Centre National de la Recherche Scientifique and the University of Toulouse.

A team led by Vasily Belokurov at the University of Cambridge in England has found the largest optical Einstein ring known. The astronomers say the object, which they dub the Cosmic Horseshoe, provides a unique laboratory for studying what the universe was like at one-fifth its present age.

An Einstein ring is a kind of cosmic mirage. Gravity from a foreground galaxy distorts light from a background galaxy into an arc. If the alignment between the background galaxy and the foreground ’lensing’ galaxy is precise enough, the distant galaxy’s light becomes warped into a complete ring.

ESA is preparing for future human exploration missions to Mars. We are currently looking for volunteers to take part in a 520-day simulated Mars mission.

To go to Mars is still a dream and one of the last gigantic challenges. But one day some of us will be on precisely that journey to the Red Planet. A journey with no way out once the spaceship is on a direct path to Mars.

These men and women will have to take care of themselves for almost two years during the roundtrip. Their survival is in their own hands, relying on the work of thousands of engineers and scientists back on Earth, who made such a mission possible.

Obese and very obese patients have a lower risk of dying after they have been treated for heart attacks than do normal weight patients, according to research published in the European Heart Journal today.

Researchers in Germany and Switzerland found that amongst patients who had received initial treatment for a specific type of heart attack, those that were obese or very obese were less than half as likely to die during the following three years as patients who had a normal body mass index (BMI).

Dr Heinz Buettner, head of interventional cardiology at Herz-Zentrum, Krozingen, Germany, who led the study, said: “Although there is no doubt that people who are overweight, obese and very obese have a higher risk of developing diabetes, hypertension and coronary artery disease, the evidenc

A probe of the upper echelons of the human brain's chain-of-command has found strong evidence that there are not one but two complementary commanders in charge of the brain, according to neuroscientists at Washington University School of Medicine in St. Louis.

It's as if Captains James T. Kirk and Jean-Luc Picard were both on the bridge and in command of the same starship Enterprise.

In reality, these two captains are networks of brain regions that do not consult each other but still work toward a common purpose — control of voluntary, goal-oriented behavior. This includes a vast range of activities from reading a word to searching for a star to singing a song, but likely does not include involuntary behaviors such as control of the pulse rate or digestion.

In a "2007 Hot Article" of the journal Biochemistry, University at Buffalo chemists report the discovery of a central mechanism responsible for the action of the powerful biological catalysts known as enzymes.

The UB research provides critical insight into why catalysis is so complex and may help pave the way for improving the design of synthetic catalysts.

“The more that is known about catalysis, the better chances we have of designing active catalysts,” said John P. Richard, Ph.D., professor of chemistry in the UB College of Arts and Sciences and co-author of the paper with Tina L. Amyes, Ph.D., UB adjunct associate professor of chemistry.