In the process the reducing power of the QH is used to pump protons across the membrane to the periplasmic space.

CCO is thought to be responsible for conserving the energy of dioxygen reduction by pumping protons into the inner mitochondrial space.

Most acidophile organisms have evolved extremely efficient mechanisms to pump protons out of the intracellular space in order to keep the cytoplasm at or near neutral pH.

This enzyme mediates the final reaction in the electron transport chain and transfers electrons to oxygen, while pumping protons across the membrane.

Purple Halobacterium species owe their color to bacteriorhodopsin, a light-sensitive protein which provides chemical energy for the cell by using sunlight to pump protons out of the cell.

These proteins use the energy released from passing electrons from reduced molecules like NADH onto oxygen to pump protons across a membrane.

The electrons then flow to the cytochrome b6f complex, which uses their energy to pump protons across the thylakoid membrane in the chloroplast.

This works by the energy released in the consumption of pyruvate being used to create a chemiosmotic potential by pumping protons across a membrane.

Here, light energy is used to pump protons across the chloroplast membrane.

The vacuolar type H +-ATPase in plants is a large multimeric enzyme complex whose function is to pump protons across a membrane via primary active transport.