Scientists’ New Goal: Make the ISS Bathroom Less Disgusting
A new antimicrobial coating could give the ISS bathroom a much-needed cleaning.
Space may be devoid of life, but us Earthlings are working hard to change that, especially when it comes to the bacteria growing in the International Space Station’s bathroom.
The ISS’s bathroom isn’t the cleanest place in the universe, which is a problem given that space travel can weaken a person’s immune system — and that antibiotic-resistant bacteria have already been found on board.
“Spaceflight can turn harmless bacteria into potential pathogens,” said Elisabeth Grohmann, a microbiologist at Beuth University of Applied Sciences Berlin, in a press release. “Just as stress hormones leave astronauts vulnerable to infection, the bacteria they carry become hardier — developing thick protective coatings and resistance to antibiotics — and more vigorous, multiplying and metabolizing faster.”
To help keep any astronauts who may have forgotten to wash their hands safe, Grohmann and her team developed a new, antimicrobial coating made of silver and ruthenium that they call AGXX, according to research published Wednesday in the journal Frontiers in Microbiology.
To test it out, the scientists put an AGXX coating on the ISS’s bathroom door. After six months, they didn’t find a bacterial cell on the surface. Some bacteria emerged after a year, but the AGXX coating still hosted 80 percent less bacteria than an uncoated steel door, according to the research.
Get the Elbow Grease
In the same press release, Grohmann blamed the bacterial growth on dust and other things that could have gotten in the way of the AGXX, adding that none of the bacteria that did survive was particularly dangerous.
“With prolonged exposure time a few bacteria escaped the antimicrobial action,” Grohmann said. “The antimicrobial test-materials are static surfaces, where dead cells, dust particles and cell debris can accumulate over time and interfere with the direct contact between the antimicrobial surface and the bacteria.”
It may not be perfect over long periods of time, but anything that keeps astronauts’ space poop where it belongs is a step in the right direction as NASA and other organizations figure out how to travel deeper into space over longer periods of time.
More on the ISS: Russia Says the American Toilet on the Space Station Blew Up