Energy charge

Energy charge

From Stryer: "Many reactions in metabolism are controlled by the energy status of the cell. One index of the energy status is the energy charge, which is proportional to the mole fraction of ATP plus half the mole fraction of ADP, given that ATP contains two anhydride bonds whereas ADP contains one. Hence the energy charge is defined as:

mbox{Energy charge} = frac{ [mbox{ATP}] + frac{1}{2} [mbox{ADP}] } { [mbox{ATP}] + [mbox{ADP}] + [mbox{AMP}] }

The energy charge can have a value ranging from 0 (all AMP) to 1(all ATP). Daniel Atkinson showed that ATP-generating (catabolic) pathways are inhibited by a high energy charge. In plots of the reaction rates of such pathways versus the energy charge, the curves are steep near an energy charge of 0.9, were they usually intersect. It is evident that control of these pathways has evolved to maintain the energy charge within rather narrow limits. In other words the energy charge like the pH of a cell is buffered. The energy charge of most cells range from 0.8 to 0.95."


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Energy Charge —   That part of an electricity bill that is based on the amount of electrical energy consumed or supplied.   The amount of money owed by an electric customer for kilowatt hours consumed.   ***   That portion of the charge for electric service… …   Energy terms

  • Energy-Charge —   [ enədʒɪ tʃɑːdʒ, englisch], Physiologie: die Energieladung …   Universal-Lexikon

  • Charge capacity —   The input (feed) capacity of the refinery processing facilities.   U.S. Dept. of Energy, Energy Information Administration s Energy Glossary …   Energy terms

  • charge controller —   An electronic device which regulates the voltage applied to the battery system from the PV array. Essential for ensuring that batteries obtain maximum state of charge and longest life.   Solar Electric Glossary …   Energy terms

  • charge — Synonyms and related words: accountability, accounting for, accounts payable, accounts receivable, accredit, accusal, accusation, accuse, accusing, achievement, action, activate, adjure, administration, admission, admission fee, admonish,… …   Moby Thesaurus

  • Capacity Charge —   An assessment on the amount of capacity being purchased.   ***   An element in a two part pricing method used in capacity transactions (energy charge is the other element). The capacity charge, sometimes called Demand Charge, is assessed on the …   Energy terms

  • Energy current — is a flow of energy defined by the Poynting vector (E×H), as opposed to normal current (flow of charge). It was originally postulated by Oliver Heaviside. Explanation Energy current is a somewhat informal term that is used, on occasion, to… …   Wikipedia

  • Charge ordering — (CO) is a (first or second order) phase transition occurring mostly in strongly correlated materials such as transition metal oxides or organic conductors. Due to the strong interaction, the charge is localized on different sites leading to a… …   Wikipedia

  • Energy harvesting — (also known as Power harvesting or energy scavenging ) is the process by which energy is captured and stored. Frequently this term is applied when speaking about small autonomous devices, like those used in sensor networks. A variety of different …   Wikipedia

  • Charge invariance — refers to the fixed electrostatic potential of a particle, regardless of speed. For example, an electron has a specific rest charge. Accelerate that electron, and the charge remains the same (as opposed to the relativistic mass and energy… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”