Historic time capsule found at Washington Monument. Before you go, we thought you'd like these... BALTIMORE (WBAL) -A piece of history has been discovered in Baltimore. The original cornerstone of the Washington Monument in Baltimore, thought to be long lost, was discovered last week while crews dug for a sewage tank.
We divide our energy use among four economic sectors: residential, commercial, transportation, and industrial. Heating and cooling our homes, lighting office buildings, driving cars and moving freight, and manufacturing the products we rely on in our daily lives are all functions that require energy.
Everything you do needs energy to drive it, whether it is running up a flight of stairs, eating breakfast, fighting off an infection, or even just producing new proteins for hair growth. The energy currency used by all cells from bacteria to man is adenosine triphosphate (ATP). Every process within an organism â DNA and protein synthesis, muscle contraction, active transport of nutrients and ions, neural activity, maintenance of osmosis, carbon fixation â requires a source of ATP. Why is ATP such a good source of energy? ATP is a nucleoside triphosphate (ribose sugar, adenine base and three phosphate groups), where a high-energy bond attaches the third phosphate group to the molecule. This bond is highly unstable, and when it is hydrolysed it releases a substantial amount of free energy (approximately 7 kcal/mole).