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VLT Spectra Indicate Shortest-Known-Period Planet Orbiting OGLE-TR-3
More than 100 exoplanets in orbit around stars other than the Sun have been found so far. But while their orbital periods and distances from their central stars are well known, their true masses cannot be determined with certainty, only lower limits.
This fundamental limitation is inherent in the common observational method to discover exoplanets – the measurements of small and regular changes in the centra
Finding is a significant step toward new insights for designing combination chemotherapy
Investigators at St. Jude Children’s Research Hospital have discovered numerous genes that alter their level of activity in characteristic patterns in response to specific chemotherapy treatments. The genes were identified in the leukemia cells of children undergoing chemotherapy for acute lymphoblastic leukemia (ALL).
The researchers say this finding is a significant step in the emergin
New digital tools
To survive and thrive in this century, business leaders need to hardwire new technologies into their playbooks to create enduring enterprises.
Many factors, from the need to export beyond national borders to the inexorable shift to intellectual capital, are driving change, but none is more important than the rise of the Internet and digital technologies. Like the steam engine or the assembly line, the Net and digital technologies have already become an adva
The lack of a special protein crucial to cell growth and development may help cancer cells proliferate, new research suggests.
Cells without this protein – E2F3 – are usually rendered genetically unstable. In most cases, such instability would either kill a cell or keep it from growing. Yet sometimes mutations alter cells in such a way that they are able to thrive and multiply, creating tumors.
“In cancer, the absence or loss of E2F3 may be a double-edged sword,” said Gustav
New high-speed imaging techniques are allowing scientists to show how a single cell mobilizes its resources to activate its immune response, a news research study shows.
Howard R. Petty, Ph.D., professor and biophysicist at the University of Michigan Health System’s Kellogg Eye Center, has dazzled his colleagues with movies of fluorescent-lit calcium waves that pulse through the cell, issuing an intracellular call-to-arms to attack the pathogens within.
He explains that these
The relationship between leguminous plants such as peas and beans and nitrogen-fixing bacteria is even closer than previously thought, with bacteria acting like an intrinsic part of the plant, according to research published in the journal Nature today.
Researchers from the University of Reading and the John Innes Centre, Norwich, have found that nitrogen-fixing bacteria provide more than just a supply of useable nitrogen to the plants. They have found that amino acid cycling between the pl