This mechanism is carried out without utilisation of metabolic energy.

In return, the plant provides the fungus with metabolic energy in the form of photosynthetic products.

This saving is a significant selective advantage, since the human nervous system uses approximately 20% of the body's metabolic energy.

"A physiologist might say sleep was to avoid wasting metabolic energy in the dark," he said.

Therefore, obese individuals are using more metabolic energy than their lean counterparts when walking at the same speed.

It can carry a 200-pound load, and reduces the metabolic energy needed by the wearer to perform a given task.

The key problem is the nature of metabolic energy and the extent of what is considered metabolism.

The increase in metabolic energy is offset by autophagy functions.

The thermophiles use the heat of Earth's hellish core to derive their metabolic energy.

The cell needs metabolic energy for each action potential it produces.