Latest Terry Schiavo Stories
Researchers have produced the strongest evidence yet that mitochondria â€” the organelles that generate energy to power the cell â€” also monitor oxygen concentration in the cell. If oxygen slips below a critical threshold, the mitochondrial â€œsensorâ€ triggers protective responses to promote survival.
- A person who stands up for something, as contrasted to a bystander who remains inactive.
- One of the upright handlebars on a traditional Inuit sled.