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The proton motive force arises from a combination of the concentration gradient of protons and a voltage gradient across the membrane (the protons are positively charged, so an imbalance of protons means that the side of the membrane with more protons has a positive charge relative to the side with fewer protons).
Full Answer. When cold and warm air collide, one of four types of frontal wedging occurs: warm, cold, stationary or occluded. A warm front occurs when warm air pushes away cold air. These usually come in from the southwest. When cold air pushes out warm air from the northwest, this is called a cold front.