Once inside, intracellular esterases broke down the acetoxymethyl esters, releasing the highly polar fluorescent dye calcein. The fluorescence from cytosolic calcein was diminished when CoCl2 was ...

Using the ROentgen SATellite (ROSAT), astronomers have discovered a new cataclysmic variable system of the polar subtype. The ...

A polar vortex collapse. Now, meteorologists are calling for another collapse in the middle of March, one that could plunge ...

Humanity's oldest and longest-running climate experiment, the International Polar Year (IPY), will run for the fifth time in ...

A polar vortex collapse is predicted to bring severe winter-like weather to parts of Canada and the US around the middle of this month. This same weather event affected several regions across ...

Churchill, Canada — Here on the edge of the Arctic in northern Canada, the annual migration of polar bears draws tourists, photographers and scientists like Geoff York. Buggies traverse the ...

Forecasters fear another polar vortex collapse like the one we saw last month could be next. So more arctic weather and “life-threatening” cold temperatures for the next few weeks. Get your ...

In recent days, extreme weather brought freezing temperatures to several states across the country due to a polar vortex that peaked on Wednesday, February 19. According to The Associated Press ...

This week, parts of the U.S. are experiencing the 10th and coldest polar vortex event this season. Weather forces in the Arctic are combining to push the chilly air into the U.S. and Europe.

The term “polar vortex” usually refers to the gigantic circular upper air weather pattern in the Arctic region. It is a normal pattern that is stronger in the winter and keeps some of the ...