{"id":211,"date":"2025-05-13T13:06:17","date_gmt":"2025-05-13T13:06:17","guid":{"rendered":"https:\/\/scienceblog.com\/wildscience\/?p=211"},"modified":"2025-05-13T13:06:17","modified_gmt":"2025-05-13T13:06:17","slug":"living-things-glow-faintly-with-invisible-light-and-death-makes-it-vanish","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/wildscience\/2025\/05\/13\/living-things-glow-faintly-with-invisible-light-and-death-makes-it-vanish\/","title":{"rendered":"Living Things Glow Faintly with Invisible Light\u2014And Death Makes It Vanish"},"content":{"rendered":"

Cutting-edge imaging technology has uncovered that all living organisms emit an extremely faint light invisible to the naked eye, with patterns that significantly differ between life and death. These ultraweak photon emissions (UPE) offer researchers a promising tool for non-invasive monitoring of biological processes and stress responses in both animals and plants.<\/p>\n

What Are Ultraweak Photon Emissions?<\/h2>\n

Researchers at the University of Calgary and Canada’s National Research Council have developed sophisticated camera systems capable of detecting these almost imperceptible light signals, which typically range from just 10-1000 photons per square centimeter per second.<\/p>\n

“The phenomenon of biological ultraweak photon emission has been observed in all living systems that have been examined,” the researchers note in their study published in ACS Photonics. Despite decades of investigation, scientists are still working to understand precisely what triggers this faint glow.<\/p>\n

Unlike bioluminescence \u2013 the dramatic light seen in fireflies or deep-sea creatures \u2013 UPE occurs in all organisms but is thousands of times fainter. It’s also distinct from thermal radiation that all objects emit based on temperature.<\/p>\n

Life vs. Death: Striking Differences in Emission Patterns<\/h2>\n

The research team utilized specialized electron-multiplying charge-coupled device (EMCCD) cameras with remarkable sensitivity \u2013 capable of detecting single photons with over 95% efficiency in the visible light range.<\/p>\n

Perhaps most significant was the dramatic difference in emissions between living and recently deceased mice. After humane euthanasia, the mice showed markedly reduced photon emissions compared to when they were alive \u2013 despite maintaining the same body temperature of 37\u00b0C.<\/p>\n

“The UPE imaging results show that the live mice consistently exhibit a significantly higher UPE intensity compared to their deceased counterparts,” the researchers reported. “This disparity illustrates a profound impact of a system’s vital state on UPE emissions.”<\/p>\n

How might these findings translate to practical applications in biomedicine? The detection of UPE could potentially enable:<\/p>\n