Science
Study suggests low-oxygen conditions help preserve brain tissue after death
Researchers analyzing mouse carcasses found that decay-causing free radicals can bond proteins together in oxygen-starved environments.
The short version
- Archaeologists have found more than 4,400 ancient human brains preserved worldwide, often without other soft tissue, posing a long-standing scientific puzzle.
- A study published in the Journal of Proteome Research examined 72 mouse carcasses to determine how soft brain tissue can persist for thousands of years.
- Researchers discovered that in wet, low-oxygen environments, unstable free radical molecules bond proteins together into a tough structure instead of breaking them down.
- The findings indicate that decay processes can directly contribute to tissue preservation under specific environmental constraints.
Key facts
- Archaeologists have discovered more than 4,400 preserved human brains around the world, with some remaining intact for up to 12,000 years.[Slashdot]
- A research team led by University of Oxford paleobiologist Alexandra Seviour published their findings in the Journal of Proteome Research on August 7.[Slashdot]
- The study involved controlled chemical experiments using 72 mouse carcasses.[Slashdot]
- When oxygen is abundant, free radicals trigger a chemical chain reaction that rapidly breaks down brain tissue proteins.[Slashdot]
- In low-oxygen environments, free radicals instead bond with adjacent proteins, hardening the tissue and preventing normal decomposition.[Slashdot]
What remains uncertain
- It remains to be fully verified how consistently these laboratory observations in mouse models explain every instance of ancient human brain preservation across diverse natural burial environments.[Slashdot]