About 13 years ago, Northeastern professor Jonathan Tilly, a reproductive biologist, made a discovery that challenged everything scientists thought they knew about female reproduction. The long-held belief that mammals were born with a set number of eggs -- and no ability to create new ones -- was wrong.

Infrared imagery provides a look at tropical cyclones at night and NASA-NOAA's Suomi NPP satellite got a look at Tropical Storm Norma in the Eastern Pacific using infrared light.

The Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard NASA-NOAA's Suomi NPP satellite captured an infrared light picture Tropical Storm Norma on Sept. 15 at 4:24 a.m. EDT (0924 UTC). The VIIRS image showed Norma's center just east of Socorro Island.

The proteins in human cells are extensively decorated with different types of sugars, a phenomenon called glycosylation. These modifications greatly increase the diversity of protein structure and function, affecting how proteins fold, how they behave, and where they go in cells. New research that will be published in the Journal of Biological Chemistry on Sept. 22 demonstrates that a rare type of glycosylation profoundly affects the function of a protein important for human development and cancer progression.

NASA's Aqua satellite captured in infrared-light image of Hurricane Max that showed the storm weakened quickly as it made landfall in southwestern Mexico. Max quickly degenerated into a large area of low pressure.

The Atmospheric Infrared or AIRS instrument aboard NASA's Aqua satellite captured infrared data on Max on Sept. 14 at 4:05 p.m. EDT (2005 UTC). At the time of the image Max's center appeared to be moving onshore to the east of Acapulco, and the eye that was observed in satellite imagery had disappeared.

Although Tropical Storm Jose was located off the coast of southeastern U.S. it is stirring up the waters along the U.S. East coast, causing dangerous conditions. NOAA's GOES East satellite saw Jose centered about 360 miles northeast of the southwestern Bahamas on Sept. 15.

The National Hurricane Center said "Jose is expected to produce high surf and life-threatening rip currents along portions of the U.S. East coast."

Satellite imagery showed that Tropical Depression 15E continued to struggle to organize while still being affected by vertical wind shear.

NOAA's GOES East satellite captured a visible image of the latest tropical cyclone to form in the Eastern Atlantic Ocean. Tropical Depression 14E formed, despite battling northerly wind shear.

On Sept. 15, 2017 at 7:45 a.m. EDT (1145 UTC), NOAA's GOES East satellite captured this visible image of the Tropical Depression 14 off the coast of western Africa. The visible image showed curved bands of thunderstorms mostly south of the center. That's because the storm is being affected by northerly vertical wind shear, pushing clouds and storms away from the center.

This September, the extent of Arctic sea ice shrank to roughly 4.7 million square kilometres, as was determined by researchers at the Alfred Wegener Institute, the University of Bremen and Universität Hamburg. Though slightly larger than last year, the minimum sea ice extent 2017 is average for the past ten years and far below the numbers from 1979 to 2006. The Northeast Passage was traversable for ships without the need for icebreakers.

Annapolis, MD; September 11, 2017--A much greater number of monarch butterflies perished in a snowstorm in March 2016 in Mexico than previously estimated, according to new research. Analysis of damage from the storm--and the ensuing salvage logging--sheds further light on the precarious state of the famed butterflies' overwintering colonies.

In April, the report of plastic bag eating caterpillars caused sensation in worldwide media. The authors around Federica Bertocchini of the University in Santander (Spain) had reported that the larvae of wax moth Galleria mellonella were able to digest polyethylene (PE). This polymer is mainly used for making plastic packaging and bags. Co-workers of Till Opatz, professor for Organic Chemistry at the Johannes Gutenberg University in Mainz (Germany), now critically examined the released data and experimental procedures by Bertocchini et al. and published a counterstatement.