Researchers at the Abramson Family Cancer Research Institute of the University of Pennsylvania have found that deleting a gene important in embryo development leads to premature aging and loss of stem cell reservoirs in adult mice.
Body
Nearly all of the 162 land-breeding frog species on Caribbean islands, including the coqui frogs of Puerto Rico, originated from a single frog species that rafted on a sea voyage from South America about 30-to-50-million years ago, according to DNA-sequence analyses led by a research group at Penn State.
Similarly, the scientists found that the Central American relatives of these Caribbean amphibians also arose from a single species that arrived by raft from South America.
Talcum powder has been used for generations to soothe babies’ diaper rash and freshen women’s faces. But University of Florida researchers report the household product has an additional healing power: The ability to stunt cancer growth by cutting the flow of blood to metastatic lung tumors.
The Nursing Institute of West Central Ohio today unveiled a new addition to the regional nursing education community—a robot.
Researchers at Georgetown University Medical Center say they are moving closer to understanding why the most lethal form of human malaria has become resistant to drug treatment in the past three decades. They have been able to artificially construct, and then express in yeast, a protozoan gene that contributes to such resistance. And it was no small feat.
Plant geneticists at Rutgers, The State University of New Jersey, may have solved one of the fundamental problems in genetically engineered or modified (GM or GMO) crop agriculture: genes leaking into the environment.
An Italian-Swiss research team, including Dr. Frank Rühli of the Institute of Anatomy at the University of Zurich in Switzerland proved the cause of death of the Iceman (“Ötzi,” 3300 BC) by modern X-ray-based technology. A lesion of a close-to-the-shoulder artery has been found thanks to a CT scan or multislice computed tomography, finally clarifying the world-famous glacier mummy’s cause of death.
The cause of death was ascertained without an autopsy (Zurich University)
Size matters. At least, it does to an alpine ibex.
According to a team of international researchers, mature, male alpine ibex demonstrate a correlation between horn growth and genetic diversity. Past research studies have shown that greater genetic diversity correlates with a greater chance of survival.
"The size of the horns reliably advertises the genetic quality of the ibex—and the bigger, the better," said Dr. David Coltman, an evolutionary geneticist at the University of Alberta.
According to years of research both in the test tube and, now, with real plants, a team of scientists reports that artificial chemicals in pesticides – through application or exposure to crops through runoff – disrupt natural nitrogen-fixing communications between crops and soil bacteria. The disruption results in lower yields or significantly delayed growth.
Alfalfa roots secrete chemical signals into soil to attract and recruit bacteria. These bacteria live in a plant's roots and provide a natural fertilizer source.
Amnesty International USA is using powerful satellite cameras to monitor highly vulnerable villages in war-torn Darfur – the first-ever technological capability by human rights defenders to track possible targets of attack, prevent new atrocities and save lives. The human rights organization is inviting ordinary people worldwide to help protect 12 villages by visiting the Eyes on Darfur project website (www.eyesondarfur.org) and put Sudanese President al-Bashir on notice that the areas are being watched around the clock.
A team of researchers from Arizona State University, Purdue University and the Norwegian University of Life Sciences has discovered evidence that honeybees have adopted a phylogenetically old molecular cascade – TOR (target of rapamycin), linked to nutrient and energy sensing – and put it to use in caste development.Effect of rapamycin/FK506 pharmacology on caste characters in honey bees (Vehicle = 2% ethanol in insect saline; FK+R = se
Birth weight has significant and lasting effects, a new study finds. Weighing less than 5.5 pounds at birth increases the probability of dropping out of high school by one-third, reduces yearly earnings by about 15 percent and burdens people in their 30s and 40s with the health of someone who is 12 years older.
Paying hospitals extra money does not appear to significantly improve the way they treat heart attack patients or how well those patients do. But giving hospitals the information that they need to improve heart attack care does help.
Low levels of testosterone may increase the long-term risk of death in men over 50 years old, according to researchers with the Department of Family and Preventive Medicine at the University of California, San Diego School of Medicine.
"The new study is only the second report linking deficiency of this sex hormone with increased death from all causes, over time, and the first to do so in relatively healthy men who are living in the community," said Gail Laughlin, Ph.D., assistant professor and study author.
A groundbreaking surgical therapy capable of stabilising and restoring vision in the vast majority of patients who currently suffer blindness through Age-Related Macular Degeneration (AMD) is to be taken to clinical trial by scientists and clinicians at the UCL Institute of Ophthalmology, Moorfields Eye Hospital and the University of Sheffield.