Imaging technique captures 3D video of cells at work in unprecedented detail
A microscope that combines two imaging techniques — including one used by astronomers — now allows researchers to capture 3D videos of living cells inside organisms.
The approach addresses long-standing problems with imaging cells in living tissue. Because of how light interacts with different shapes and materials, trying to get a picture of a cell alongside its neighbours is like looking through a bag of marbles, says Eric Betzig, a physicist at the Howard Hughes Medical Institute's Janelia Research Campus in Ashburn, Virginia, who led the team that developed the device. To produce crisp images, conventional microscopes often isolate their subjects on a glass slide or bombard them with potentially harmful amounts of light.
By Adrian Cho
The nature of dark matter, the mysterious stuff whose gravity presumably binds a galaxy together, is sinking back into the shadows. Three years ago, a team of astronomers reported that dark matter might interact with itself through some force other than gravity, a hint that might help theorists figure out what it is. But new observations rule out such interactions, the same team reports today at the joint European Week of Astronomy and Space Science and National Astronomy Meeting 2018 in Liverpool, United Kingdom.
Washington came out swinging against Moscow when it announced new sanctions Friday against two dozen Russian nationals and 14 Russian entities.
The sanctions target seven Russian oligarchs and 17 senior government officials who are closely aligned with the Kremlin. The US will also penalize 12 companies operated by the sanctioned oligarchs; Rosoboroneksport, a state-owned weapons manufacturer known to have transported arms to the Syrian regime; and Rosoboroneksport's subsidiary, the Russian Financial Corporation Bank.
Friday's sanctions pack a big punch for one key reason: they target some of Russia's wealthiest citizens, many of whom are linked to Russian President Vladimir Putin.
The Navy hopes to increase its current submarine construction op-tempo and build as many as three Virginia-class submarines per year to more rapidly address the services’ attack submarine deficit.
The previous status quo had been for the Navy to drop from building two Virginia-Class boats per year to one in the early 2020s when construction of the new Columbia-Class nuclear armed submarines begins. The service then moved to a plan to build two Virginia-class submarines and one Columbia-class submarine concurrently, according to findings from a Navy assessment.