A physical handicap like being tied down makes men over-estimate an opponent's size and under-estimate their own, according to research published August 7 in the open access journal PLOS ONE by Daniel Fessler and Colin Holbrook from the University of California, Los Angeles. Participants who were tied down in a chair envisioned an angry man in a picture as being taller than when they made the same type of guess while simply sitting in the chair without being restrained. In a second test where they were asked to state their own height based on visual marks on a wall, ...

Some optical illusions look like they're in motion even though the picture is static. A new map of the fly brain also suggests motion—or at least how the fly sees movement. The new research, published in the August 8 issue of Nature, takes advantage of a high-throughput approach that speeds the charting of neuronal connections involved in motion detection. Neurons snake through the brain, each reaching out and touching many other neurons. In the human brain, 100 billion neurons make on average 1,000 connections each. That intricate network is the secret behind all the ...

A newly discovered fossil reveals the evolutionary adaptations of a 165-million-year-old proto-mammal, providing evidence that traits such as hair and fur originated well before the rise of the first true mammals. The biological features of this ancient mammalian relative, named Megaconus mammaliaformis, are described by scientists from the University of Chicago in the Aug 8 issue of Nature. "We finally have a glimpse of what may be the ancestral condition of all mammals, by looking at what is preserved in Megaconus. It allows us to piece together poorly understood details ...

The National Institutes of Health today announced in Nature that it has reached an understanding with the family of the late Henrietta Lacks to allow biomedical researchers controlled access to the whole genome data of cells derived from her tumor, commonly known as HeLa cells. These cells have already been used extensively in scientific research and have helped make possible some of the most important medical advances of the past 60 years. These include the development of modern vaccines, cancer treatments, in vitro fertilization techniques, and many others. HeLa cells ...

INDIANAPOLIS -- Researchers from Indiana University, the University of Michigan, the Fred Hutchinson Cancer Research Center and the Dana-Farber Cancer Institute have identified and validated a biomarker accessible in blood tests that could be used to predict which stem cell transplant patients are at highest risk for a potentially fatal immune response called graft-versus-host disease. Although transplant specialists have been able to reduce its impact, graft-versus-host disease remains a leading cause of death among patients who receive a stem cell transplant from another ...

The range of helpful bacteria in the guts of infants delivered by caesarean section, during their first two years of life, is narrower than that of infants delivered vaginally, indicates a small study published online in the journal Gut. This has implications for the development of the immune system, say the researchers, particularly as the C-section infants had lower levels of the major group of gut bacteria associated with good gut health, Bacteroidetes phylum, as well as chemicals that help curb allergic responses. The researchers assessed the patterns of bacterial ...

Rheumatoid arthritis significantly increases the risk of potentially fatal blood clots in the legs and lungs, reveals a large nationwide study published online in the Annals of the Rheumatic Diseases. Between 11% and 30% of people who develop a blood clot in the legs, known as a deep vein thrombosis or DVT, or a blood clot in the lungs, known as a pulmonary embolism, or PE, die within 30 days of their diagnosis, the evidence suggests. Several studies have shown that chronic inflammation, which typifies rheumatoid arthritis, is linked to a heightened risk of thickened ...

A team from the University of Washington has unveiled a comprehensive portrait of the genome of the world's first immortal cell line, known as HeLa. The cell line was derived in 1951 from an aggressive cervical cancer that killed Henrietta Lacks, a 31-year-old African-American tobacco farmer and mother of five – the subject of the 2010 New York Times bestseller, The Immortal Life of Henrietta Lacks. They will also be the first group to publish under a new National Institutes of Health (NIH) policy for HeLa genomic data, established through discussions with Lacks' family. The ...

In a discovery that further demonstrates just how unexpected and unusual nature can be, scientists have found two strains of bacteria whose symbiotic relationship is unlike anything seen before. Long, thin, hairlike Thioploca (meaning "sulfur braids" in Spanish) trichomes form chains down into marine sediment, which tiny anammox cells ride down like an elevator. At the bottom, the anammox cells consume the waste products of the Thioploca: nitrite and ammonium, or "fixed" nitrogen. Nitrogen is a crucial building block of life, a prerequisite for photosynthesis. While ...

BETHESDA, MD -- The first study to sequence and analyze the entire genome of a HeLa cell line, along with access to its sequence data, has been published today (Wednesday, August 7) in its final version, by G3: Genes|Genomes|Genetics, an open-access, scientific journal of the Genetics Society of America. The article, "The Genomic and Transcriptomic Landscape of a HeLa Cell Line," by Landry et al., was authored by scientists at the European Molecular Biology Laboratory (EMBL) in Heidelberg, Germany, and was published in an early online version March 11, 2013. Genomic ...

Organic solar cells that convert light to electricity using carbon-based molecules have shown promise as a versatile energy source but have not been able to match the efficiency of their silicon-based counterparts. Now, researchers have discovered a synthetic, high-performance polymer that behaves differently from other tested materials and could make inexpensive, highly efficient organic solar panels a reality. The polymer, created at the University of Washington and tested at the University of Cambridge in England, appears to improve efficiency by wringing electrical ...

One of the most basic and intensively studied processes in biology—one which has been detailed in biology textbooks for decades—has gained a new level of understanding, thanks to the application of simple math to a problem that scientists never before thought could benefit from mathematics. The scientists who made the discovery, published in this week's advance online publication of Nature, found that the process bacteria use to quickly adapt to metabolize preferred energy sources such as glucose—a process called "catabolite repression"—is controlled not just by glucose, ...

Dogs yawn contagiously when they see a person yawning, and respond more frequently to their owner's yawns than to a stranger's, according to research published August 7 in the open access journal PLOS ONE by Teresa Romero and colleagues from the University of Tokyo. Pet dogs in the study watched their owner or a stranger yawn, or mimic a yawning mouth movement, but yawned significantly more in response to their owners' actions than to the strangers' yawns. The dogs also responded less frequently to the fake movements, suggesting they have the ability to yawn contagiously. ...

NEW YORK, AUGUST 7, 2013 — A new study by thoracic surgeons and pathologists at Memorial Sloan-Kettering Cancer Center shows that a specific pattern found in the tumor pathology of some lung cancer patients is a strong predictor of recurrence. Knowing that this feature exists in a tumor's pathology could be an important factor doctors use to guide cancer treatment decisions. According to the study's authors, the findings offer the first scientific evidence that may not only help surgeons identify which patients are more likely to benefit from less radical lung-sparing ...

PHILADELPHIA - Patients with mild, moderate and severe psoriasis had increasingly higher odds of having at least one major medical disease in addition to psoriasis, when compared to patients without psoriasis. Reporting findings in JAMA Dermatology, researchers from the Perelman School of Medicine at the University of Pennsylvania, concluded that the severity of disease, as measured by the percentage of body surface area affected by psoriasis, was strongly linked to an increased presence of other diseases affecting the lungs, heart, kidneys, liver and pancreas. The research ...

Call it the Goldilocks Principle — animals can survive and reproduce only if the temperature is just right. Too hot and they will overheat. Too cold and they will freeze. To stay in their comfort zone, animals have evolved very sensitive temperature sensors to detect the relatively narrow margin in which they can survive. Until recently, scientists knew little about how these sensors operated. Now, a team of Brandeis University scientists has discovered a previously unknown molecular temperature sensor in fruit flies belonging to a protein family responsible for sensing ...

For the longest time, all that was known about this long-extinct mammal was a few little teeth with striking cusps on their occlusal surfaces. "Paleontologists have been wondering for over a hundred years what the animal that went with these teeth might have looked like," said Prof. Dr. Thomas Martin from the Steinmann-Institut of the University of Bonn. The matter was elucidated when locals found a completely preserved skeleton of the enigmatic mammal in Northeast China, which was then aquired by the Paleontological Museum of Liaoning in Shenyang. Together with Dr. Chang-Fu ...

Eprobe®, a highly efficient and reliable fluorescent probe for PCR DNA amplification techniques and DNA analysis in hybridization experiments, has been developed by researchers from RIKEN and Japanese firm K.K.DNAFORM. This technology will enable the development of new, advanced assays for DNA-based genetic testing and help to bring the benefits of genome-wide sequencing studies to patients in the clinic. Takeshi Hanami, Diane Delobel and colleagues from the RIKEN Center for Life Science Technologies, the RIKEN Preventive Medicine & Diagnosis Innovation Program, and K.K.DNAFORM ...

Life is not a walk in the park for the world's largest bacteria, that live as soft, noodle-like, white strings on the bottom of the ocean depths. Without being able to fend for themselves, they get invaded by parasitic microorganisms that steal the nutrition, that they have painstakingly retreived. This newly discovered bizarre deep ocean relationship may ultimately impact ocean productivity, report researchers from University of Southern Denmark now in the scientific journal Nature. At the bottom of the eastern Pacific off Mexico we find one of the largest bacteria in ...

People experiencing sudden cardiac arrest at exercise facilities have a higher chance of survival than at other indoor locations, likely due to early CPR and access to an automated external defibrillator (AED), among other factors, according to a study published online today in the Journal of the American College of Cardiology. The findings underscore the importance of having AEDs in places where people exert themselves and are at greater risk of sudden cardiac arrest. Previous studies have shown that regularly exercising greatly reduces a person's overall risk of sudden ...

Ice ages and warm periods have alternated fairly regularly in the Earth's history: the Earth's climate cools roughly every 100,000 years, with vast areas of North America, Europe and Asia being buried under thick ice sheets. Eventually, the pendulum swings back: it gets warmer and the ice masses melt. While geologists and climate physicists found solid evidence of this 100,000-year cycle in glacial moraines, marine sediments and arctic ice, until now they were unable to find a plausible explanation for it. Using computer simulations, a Japanese, Swiss and American ...

This news release is available in French. Delivering a two-year intervention programme to disruptive kindergarten children could help prevent substance use in adolescence, according to a new study published in the British Journal of Psychiatry. Alcohol and drug use are highly prevalent and problematic among young people, and the link between childhood behaviour problems and adolescent substance misuse is well-recognised. In this study, Canadian researchers set out to examine whether a two-year prevention programme in childhood could stop substance misuse problems ...

Organic solar cells, a new class of solar cell that mimics the natural process of plant photosynthesis, could revolutionise renewable energy - but currently lack the efficiency to compete with the more costly commercial silicon cells. Currently, organic solar cells can achieve as much as 12 per cent efficiency in turning light into electricity, compared with 20 to 25 per cent for silicon-based cells. Now, researchers have discovered that manipulating the 'spin' of electrons in these solar cells dramatically improves their performance, providing a vital breakthrough ...

One of the many counterintuitive and bizarre insights of quantum mechanics is that even in a vacuum—what many of us think of as an empty void—all is not completely still. Low levels of noise, known as quantum fluctuations, are always present. Always, that is, unless you can pull off a quantum trick. And that's just what a team led by researchers at the California Institute of Technology (Caltech) has done. The group has engineered a miniature silicon system that produces a type of light that is quieter at certain frequencies—meaning it has fewer quantum fluctuations—than ...

Genomic sequencing experts at Johns Hopkins partnered with pharmacologists at Stony Brook University to reveal a striking mutational signature of upper urinary tract cancers caused by aristolochic acid, a plant compound contained in herbal remedies used for thousands of years to treat a variety of ailments such as arthritis, gout and inflammation. Their discovery is described in the Aug. 7 issue of Science Translational Medicine. Aristolochic [pronounced a-ris-to-lo-kik] acid is found in the plant family "Aristolochia," a vine known widely as birthwort, and while the ...