RSS feed source: National Science Foundation
On July 10, 2025, NSF issued an Important Notice providing updates to the agency’s research security policies, including a research security training requirement, Malign Foreign Talent Recruitment Program annual certification requirement, prohibition on Confucius institutes and an updated FFDR reporting and submission timeline.
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RSS feed source: National Science Foundation
On July 10, 2025, NSF issued an Important Notice providing updates to the agency’s research security policies, including a research security training requirement, Malign Foreign Talent Recruitment Program annual certification requirement, prohibition on Confucius institutes and an updated FFDR reporting and submission timeline.
Click this link to continue reading the article on the source website.
RSS feed source: National Science Foundation
Researchers supported by the U.S. National Science Foundation have discovered that it is not how much of a key molecule that allows axolotls to regenerate limbs properly, it is how little. This new knowledge moves researchers closer to enabling tissue repair and, possibly, limb regeneration in humans.
“Axolotls are a species of salamander that have the ability to regrow limbs and repair organ tissue,” said Anna Allen, a program officer in the NSF Directorate for Biological Sciences. “Based on previous work, researchers knew that a particular molecule told cells to start the process of regrowth but how cells knew where they were along a limb and, therefore, what structure to build in that location remained a mystery.”
The new work, led by James Monaghan, a professor of biology and director of the Institute for Chemical Imaging of Living Systems at Northeastern University, shows that the key is how that critical molecule, retinoic acid, degrades. An enzyme whose only job is to destroy retinoic acid is extremely prevalent at the far end of the limb (the wrist) but much less prevalent at the shoulder, meaning the reverse for retinoic acid. It is this decreasing amount of retinoic acid that allows the cells to know if they are at the shoulder, mid-limb, or wrist.
Building on their findings, the researchers used CRISPR technology to turn off certain
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RSS feed source: National Science Foundation
Workers Exceeded Annual Dose Limit
Print View Posted on: 17 July 2025
Event Date: 08 April 2025 Event Type: Irradiation/Accelerator Facility Event Location: United States of America, Noblesville, Indiana/ Curium US LLC INES Rating: 2 (Final)
On April 8, 2025, two workers were performing waste handling activities in a hot cell basement of a cyclotron facility that produces strontium-82 from metallic rubidium targets. One worker removed a high-level liquid waste container from a shielded barrel and placed the unshielded container on the ground adjacent to the work area, where activities continued for approximately 15 minutes. Both workers’ electronic dosimeters alarmed for high dose soon after the container was removed from shielding; however, neither worker noticed these alarms because of the personal protective equipment they had donned, including respirators. Radiation surveys were performed upon entry to the area and prior to removing the container from shielding, but not again until after the workers left the area and noticed the excessive doses recorded on their electronic dosimeters. Radiation dose rates on contact with the waste container exceeded 9.99 Sv/hr (999 R/hr), which was the upper limit of available instrumentation. The licensee later
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