For sockeye salmon coming home after years spent at sea, a magnetic map is apparently responsible for their remarkable sense of direction. That's according to an analysis of data collected over 56 years and reported online on February 7 in Current Biology, a Cell Press publication. "To find their way back home across thousands of kilometers of ocean, salmon imprint on the magnetic field that exists where they first enter the sea as juveniles," said Nathan Putman of Oregon State University. "Upon reaching maturity, they seek the coastal location with the same magnetic ...

AUDIO: This is a recording of ant pupa sound. Click here for more information. For young ants at the pupal stage of life—caught between larva and adulthood—status is all about being heard. The findings, reported online on February 7 in Current Biology, a Cell Press publication, add to evidence that ants can communicate abstract information through sound in addition to chemical cues. "One of the truly fascinating characteristics of social insects is their power of self-organization, ...

As the elderly age, their ability to concentrate, reason, and recall facts tends to decline in part because their brains generate fewer new neurons than they did when they were younger. Now, researchers reporting in the February 7th issue of the Cell Press journal Cell Stem Cell have discovered a molecule that accumulates with age and inhibits the formation of new neurons. The finding might help scientists design therapies to prevent age-related cognitive decline. The investigators identified the molecule, called Dickkopf-1 or Dkk1, in the brains of aged mice. By blocking ...

Studies in animals have raised concerns that tumors may grow faster after the anticancer drug sunitinib is discontinued. But oncologists and physicists who collaborated to analyze data from the largest study of patients with kidney cancer convincingly demonstrate that such tumor acceleration does not occur in humans. The findings, publishing online on February 7th in the Cell Press journal Cell Reports, suggest that sunitinib does not cause lingering risks for patients after their treatment ends. "We were able to demonstrate that this applied across all patients and that ...

Through a series of investigations in mice and humans, Johns Hopkins researchers have identified a protein that appears to be the target of both antidepressant drugs and electroconvulsive therapy. Results of their experiments explain how these therapies likely work to relieve depression by stimulating stem cells in the brain to grow and mature. In addition, the researchers say, these experiments raise the possibility of predicting individual people's response to depression therapy, and fine-tuning treatment accordingly. Reports on separate aspects of the research were published ...

In an update to previous research, Johns Hopkins neurologists say minimally invasive delivery of the drug tPA directly into potentially lethal blood clots in the brain helped more patients function independently a year after suffering an intracerebral hemorrhage (ICH), a deadly and debilitating form of stroke. Rates of functional recovery with the active tPA treatment far surpassed those achieved with standard "supportive" therapy that essentially gives clots a chance to shrink on their own. In the current Johns Hopkins-led study, ICH patients who randomly received the ...

A stroke survivor's chances of living independently after 90 days are not improved by the use of devices inserted into the artery to dissolve or remove a stroke-causing clot shortly after the onset of symptoms, according to a randomized controlled trial involving 656 patients. The study, funded by the National Institute of Neurological Disorders and Stroke (NINDS), part of the National Institutes of Health, compared the intra-arterial device-based approach plus the current standard of intravenous (IV) tissue plasminogen activator (t-PA), a clot-busting drug with IV t-PA ...

VIDEO: This video (S3 in the paper) shows the transport defect of the serotonin receptor in a KIF13A knock out neuron compared with a wild type neuron. Click here for more information. When motors break down, getting where you want to go becomes a struggle. Problems arise in much the same way for critical brain receptors when the molecular motors they depend on fail to operate. Now, researchers reporting in Cell Reports, a Cell Press publication, on February 7, have shown ...

CORVALLIS, Ore. – The mystery of how salmon navigate across thousands of miles of open ocean to locate their river of origin before journeying upstream to spawn has intrigued biologists for decades, and now a new study may offer a clue to the fishes' homing strategy. In the study, scientists examined 56 years of fisheries data documenting the return of sockeye salmon to the Fraser River in British Columbia – and the route they chose around Vancouver Island showed a correlation with changes in the intensity of the geomagnetic field. Results of the study, which was supported ...

STANFORD, Calif. — It's established dogma that the immune system develops a "memory" of a microbial pathogen, with a correspondingly enhanced readiness to combat that microbe, only upon exposure to it — or to its components though a vaccine. But a discovery by Stanford University School of Medicine researchers casts doubt on that dogma. In a path-breaking study to be published online Feb. 7 in Immunity, the investigators found that over the course of our lives, CD4 cells — key players circulating in blood and lymph whose ability to kick-start the immune response to viral, ...

A study out today in the journal Cell Stem Cell shows that human brain cells created by reprogramming skin cells are highly effective in treating myelin disorders, a family of diseases that includes multiple sclerosis and rare childhood disorders called pediatric leukodystrophies. The study is the first successful attempt to employ human induced pluripotent stem cells (hiPSC) to produce a population of cells that are critical to neural signaling in the brain. In this instance, the researchers utilized cells crafted from human skin and transplanted them into animal models ...

COLUMBUS, Ohio – New research suggests that zinc helps control infections by gently tapping the brakes on the immune response in a way that prevents out-of-control inflammation that can be damaging and even deadly. Scientists determined in human cell culture and animal studies that a protein lures zinc into key cells that are first-responders against infection. The zinc then interacts with a process that is vital to the fight against infection and by doing so helps balance the immune response. This study revealed for the first time that zinc homes in on this pathway ...

A study at the University of Liverpool into the spread of sexually transmitted infection in ladybirds has shown that disease risk to large populations cannot be predicted without a full understanding of the disease dynamics at small geographical scale. Scientists investigated a virulent form of infection in the central and northern European populations of the two-spot ladybird to understand the conditions that favoured disease spread. Researchers found that disease burden in two locations of the same habitat – the lime tree - were very different, despite being within ...

Boston, MA, Feb. 7, 2013 – Doctors routinely track their patients' hand-eye coordination to monitor any neuromuscular deficits, particularly as patients age or when they are injured -- but the tests they have been using to track this kind of information may be subjective and qualitative. Researchers at the Wyss Institute for Biologically Inspired Engineering at Harvard University, the Beth Israel Deaconess Medical Center, and Hebrew SeniorLife, Boston (BIDMC), recently completed the first clinical study of a new rapid neuroassessment device they developed to quantitatively ...

DALLAS – Feb. 7, 2013 – UT Southwestern Medical Center scientists have synthesized a peptide that shows potential for pharmaceutical development into agents for treating infections, neurodegenerative disorders, and cancer through an ability to induce a cell-recycling process called autophagy. Autophagy is a fundamental recycling process in which intracellular enzymes digest unneeded and broken parts of the cell into their individual building blocks, which are then reassembled into new parts. The role of autophagy is crucial both in keeping cells healthy and in enabling ...

JUPITER, FL, February 7, 2013 – Using two different compounds they developed, scientists from the Florida campus of The Scripps Research Institute (TSRI) have been able to show in animal models that inhibiting a specific enzyme protects heart cells and surrounding tissue against serious damage from heart attacks. The compounds also protect against additional injury from restored blood flow after an attack, a process known as reperfusion. The study, which was led by Philip LoGrasso, a professor and senior scientific director of discovery biology at Scripps Florida, appears ...

EAST LANSING, Mich. — The stark contrast between America's "me-first" culture and the "collective-good" mentality in China is reflected in the two countries' use of social networking sites, according to a new study led by a Michigan State University scholar. U.S. citizens spend more time on the networking sites, consider them to be more important and have more "friends" on the sites, the research found. The most popular social networking site in the United States is Facebook; in China it's Ozone. Linda Jackson, MSU professor of psychology, said Chinese citizens tend ...

In time for Valentine's Day, Personality and Social Psychology Bulletin is featuring several new studies all about relationships – including the link between income in marriage and health, the role of jealousy in becoming a parent, and how humor affects romantic couples in conflict. Being the breadwinner has health costs Men whose wives earn more income are more likely to use erectile dysfunction medication than those who outearn their wives, even when the inequality is small, according to a new study. Researchers looking at more than 200,000 married couples in Denmark ...

Endlessly frustrated by congested roads, computer scientists at California State University, in Fullerton have developed a satellite navigation system, GeoTNavi, which hooks into historical traffic data and current vehicle movements to find the shortest commute and avoid the traffic jams. Writing in the latest issue of the International Journal of Data Mining, Modelling and Management, Shawn Wang and colleagues explain how the California highway system is one of the most complicated and busiest highway systems in the USA with well over 83% of urban interstate congestion. ...

Men who reported permanent stress have a significantly higher risk of developing type 2 diabetes than men who reported no stress. This is the finding of a 35-year prospective follow-up study of 7,500 men in Gothenburg, by the University of Gothenburg, Sweden. Since the 1970s, a large population based cohort study has been undertaken at the Sahlgrenska Academy, University of Gothenburg to monitor the health of men born in Gothenburg between 1915 and 1925. Using this unique material, researchers are now able to show that permanent stress significantly increases the risk ...

Researchers from the Polytechnic University of Catalonia have developed a technique that improves and cuts the cost of a technique called electroporation, which involves opening pores in cell membranes using an electric field to introduce substances like drugs and DNA. Current methods are aggressive and expensive whereas the new system manages to apply low voltage electroporation with a small printed circuit board, which costs less than a Euro per unit and does not damage cells. Two US firms in Boston and San Francisco operating in the biotechnology equipment sector have ...

Asians (about 60 percent) are much more likely to be college-educated than Anglos (under 40 percent), according to Rice University's Kinder Institute Houston Area Asian Survey, the first systematic look at the local Asian population based on three surveys conducted over a 16-year period. The findings were released today by Stephen Klineberg, Kinder Institute co-director and Rice sociologist, at an event hosted by the institute at the Asia Society Texas Center. The surveys, conducted in 1995, 2002 and 2011 in conjunction with the annual Kinder Institute Houston Area Survey, ...

PITTSBURGH—Crowdsourcing is an effective way to mobilize people to accomplish tasks on a global scale, but some researchers fear that crowd work for pay could easily become the high-tech equivalent of a sweat shop. Trivial work for rock bottom pay isn't inevitable, however, and they've outlined a research agenda to make crowd work both intellectually and monetarily rewarding. Leading researchers in crowd work from Carnegie Mellon University and other institutions will present their plan, hashed out in a special workshop last spring, at the Association for Computing Machinery's ...

Mild traumatic brain injury (TBI), including concussion, is one of the most common types of neurological disorder, affecting approximately 1.3 million Americans annually. It has received more attention recently because of its frequency and impact among two groups of patients: professional athletes, especially football players; and soldiers returning from mid-east conflicts with blast-related TBI. An estimated 10 to 20 percent of the more than 2 million U.S. soldiers deployed in Iraq or Afghanistan have experienced TBI. A recent study by psychiatrists with the Iowa City ...

The growing ease of DNA sequencing has led to enormous advancements in the scientific field. Through extensive networked databases, researchers can access genetic information to gain valuable knowledge about causative and preventative factors for disease, and identify new targets for future treatments. But the wider availability of such information also has a significant downside — the risk of revealing personal information. Researchers from Tel Aviv University and the Whitehead Institute of Biomedical Research in Cambridge, MA, have developed an algorithm that can identify ...